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Colloquium のバックアップの現在との差分(No.29)


  • 追加された行はこの色です。
  • 削除された行はこの色です。
#norelated
* 理論コロキウム2016 [#z407468f]
* 理論コロキウム2017 [#z407468f]

理論コロキウムは原則として毎週水曜日の午後13:30から開催しています。~
原則として英語で講演していただきますが、
講師・参加者が日本人だけの場合は日本語に切り替えてくださって結構です。~
講師・参加者が日本人だけの場合は日本語に切り替えてくださっても(英語のままでも)結構です。~
台内・台外また分野を問わず広く発表者(台外の方には旅費・謝金あり)を募集しています。~
お問い合わせは以下のコロキウム係までお願いします(_AT_を@に変更してください)。~

- 滝脇知也 takiwaki.tomoya_AT_nao.ac.jp~
- 守屋 尭 takashi.moriya_AT_nao.ac.jp~
- 片岡 章雅 akimasa.kataoka_AT_nao.ac.jp~
- Kenneth Wong ken.wong ATM nao.ac.jp~
- 高橋 博之 takahashi ATM cfca.jp~
- 平居 悠 yutaka.hirai ATM nao.ac.jp

//~理論コロキウムの前には台内の発表者による[[ショートコロキウム>Short]]を行っています。 

** Schedule & History [#j2453518]

[[2010年度:http://th.nao.ac.jp/seminar/colloquium/2010/]]
[[2011年度:http://th.nao.ac.jp/seminar/colloquium/2011/index_2011.html]]
[[2012年度:http://th.nao.ac.jp/seminar/colloquium/2012/]] 
[[2013年度:http://th.nao.ac.jp/seminar/colloquium/2013/]] 
[[2014年度:http://th.nao.ac.jp/seminar/?Colloquium2014]] 
[[2015年度:http://th.nao.ac.jp/seminar/?Colloquium2015]] 
[[2016年度:http://th.nao.ac.jp/seminar/?Colloquium2016]] 


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|Date|Speaker|Title|Place/Time|remarks|h
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|[[4/6>#long0406]]|all internal members|self-introduction|Conference room, Cosmos Lodge / 13:30||
|[[4/13>#long0413]]|Tomoya Takiwaki (NAOJ DTA)|A Clockwork Supernova: precision numerical experiments and their applications|Conference room, Cosmos Lodge / 13:30||
|[[4/20>#long0420]]|Yuki Tanaka (NAOJ CfCA)|Magnetically Driven Wind from Hot Gaseous Planets|Conference room, Cosmos Lodge / 13:30||
|[[4/25>#long0425]]|Kohei Inayoshi (Columbia University)|Hyper-Eddington accretion flows onto massive black holes|Lecture Room/ 13:30||
|[[4/27>#long0427]]|Tetsuo Taki (NAOJ CfCA)|Toward formation of rocky planetesimals: dust and gas density evolution at a local structure of protoplanetary disks|Conference room, Cosmos Lodge / 13:30||
|[[5/11>#long0511]]|Masahiro Ogihara (NAOJ DTA)|Formation of close-in super-Earths|Conference room, Cosmos Lodge / 13:30||
|[[5/18>#long0518]]|Takashi Moriya (NAOJ DTA)|Superluminous supernovae and their origins|Large seminar room / 13:30||
|[[5/25>#long0525]]|Yukari Ohtani (NAOJ CfCA)|Study of relation between emission of supernova shock breakout and central engine activity|Conference room, Cosmos Lodge / 13:30||
|[[6/1>#long0601]]|Shogo Tachibana (Hokkaido University)|Timing of gas clearing of the protosolar disk: Constraints from 129I-129Xe ages of solar-wind-rich meteorites|Conference room, Cosmos Lodge / 13:30||
|[[6/8>#long0608]]|Alessandro Sonnenfeld (IPMU)|Dark matter in early-type galaxies: a lensing view|Conference room, Cosmos Lodge / 13:30||
|[[6/15>#long0615]]|Makoto Takamoto (University of Tokyo)|Relativistic Magnetohydrodynamic turbulence in Poynting-Dominated Plasmas and its effects on Current Sheet Dynamics|Conference room, Cosmos Lodge / 13:30||
|[[6/22>#long0622]]|Takahiro Sumi (Osaka University)|Microlensing exoplanet search toward the solar system analog|Conference room, Cosmos Lodge / 13:30||
|[[6/29>#long0629]]|Carmen Adriana Martínez Barbosa (Leiden Observatory, University of Leiden)|Tracing the journey of the Sun and the solar siblings through the Milky Way|Conference room, Cosmos Lodge / 13:30||
|[[7/6>#long0706]]|Shota Kisaka (Aoyama Gakuin University)|Engine-powered macronovae|Conference room, Cosmos Lodge / 13:30||
|[[7/13>#long0713]]|Tomoaki Matsumoto (Hosei University)|Theoretical Models of Protostellar Binary and Multiple Systems with AMR Simulations.|Conference room, Cosmos Lodge / 13:30||
|[[8/24>#long0824]]|Hui Jiang (Shanghai Maritime University)|  Local Nuclear Mass Relations|Conference room, Cosmos Lodge / 10:30||
|[[8/31>#long0831]]|Sherry Suyu (MPA)| Shedding Light on the Dark Cosmos through Gravitational Lensing|Large Seminar Room / 13:30||
|[[9/21>#long0921]]|Kazunori Akiyama (MIT)|TBA|Conference room, Cosmos Lodge / 13:30||
|[[10/5>#long1005]]|Toshio Fukushima (NAOJ)|Numerical integration of gravitational field for general three-dimensional objects and its application to gravitational study of grand design spiral arm structure|Conference room, Cosmos Lodge / 13:30||
|[[10/12>#long1012]]|Annop Wongwathanarat (RIKEN)|TBA|Conference room, Cosmos Lodge / 13:30||
|[[10/19>#long1019]]|Naoki Yamamoto(Keio University)|TBA|Conference room, Cosmos Lodge / 13:30||
|[[10/26>#long1019]]|Chit Hong Yam (JAXA)|TBA|TBA / 13:30||
|[[11/9>#long1109]]|Hisasi Hayakawa(Kyoto University)|TBA|Conference room, Cosmos Lodge / 13:30||
|[[11/22>#long1122]]|Shota Shibagaki(NAOJ)|TBA|Conference room, Cosmos Lodge / 13:30||
|[[4/5>#long0405]]|all internal members|self-introduction|Conference room, Cosmos Lodge / 13:30||
|[[4/12>#long0412]]|Shing Chi Leung (Kavli IPMU)|Nucleosynthesis of Type Ia supernovae|Conference room, Cosmos Lodge / 13:30||
|[[4/17>#long0417]]|Toshihiko Kawano (LANL/Tokyo Tech)|beta-delayed neutron emission and fission for r-process nucleosynthesis|Conference room, Cosmos Lodge / 13:30||
|[[4/19>#long0419]]|Masaki Yamaguchi (U. Tokyo)|The number of black hole-star binaries discovered by the astrometric satellite, Gaia|Conference room, Cosmos Lodge / 13:30||
|[[4/26>#long0426]]| Tomohisa Kawashima (NAOJ DTA)|Radiation hydrodynamic simulations of super-critical accretion columns onto neutron stars in ULX-pulsars|Conference room, Cosmos Lodge / 13:30||
|[[5/08>#long0508]]| Jonathan C. Tan (University of Florida)| Inside-Out Planet Formation |Conference room, Cosmos Lodge / 13:30||
|[[5/10>#long0510]]| Shinpei Shibata (Yamagata University)| Physics of The Rotation Powered Pulsar |Conference room, Cosmos Lodge / 13:30||
|[[5/17>#long0517]]| Tomohiro Ono (Kyoto University)| Large-scale Gas Vortex Formed by the Rossby Wave Instability |Rinkoh room / 13:30||
|[[5/24>#long0524]]| Naonori Sugiyama (IPMU)| Kinematic Sunyaev-Zel'dovich effect|Conference room, Cosmos Lodge / 13:30||
|[[5/31>#long0531]]| Shogo Ishikawa (NAOJ CfCA)|The Galaxy-Halo Connection in High-redshift Universe|Conference room, Cosmos Lodge / 13:30||
|[[6/7>#long0607]]| Tomoya Kinugawa (U. Tokyo)|Compact binary remnants from first stars for the gravitational wave source|Conference room, Cosmos Lodge / 13:30||
|[[6/12>#long0612]]|Yamaç Pehlivan (Mimar Sinan University)|Stars as extreme laboratories for neutrino physics|Conference room, Cosmos Lodge / 13:30||
|[[6/14>#long0614]]|Cemsinan Deliduman (Mimar Sinan University)|Astrophysics with Weyl Gravity|Rinkoh room / 13:30||
|[[6/21>#long0621]]|Hiroyuki Kurokawa (ELSI, Tokyo Tech)|Hydrodynamics of first atmospheres of planets embedded in protoplanetary disk|Conference room, Cosmos Lodge/ 13:30||
|[[6/28>#long0628]]| Masanobu Kunitomo (Nagoya University)|Revisiting the pre-main sequence evolution of low-mass stars: Importance of accretion and deuterium abundance|Conference room, Cosmos Lodge / 13:30||
|[[7/5>#long0705]]| Yuta Asahina (NAOJ CfCA)| MHD Simulations of the Feedback via an AGN outflow to the inhomogenious interstellr medium |Conference room, Cosmos Lodge / 13:30||
|[[7/12>#long0712]]| Shoko Oshigami (NAOJ CfCA)|Mare volcanism: Reinterpretation based on Kaguya Lunar Radar Sounder data|Conference room, Cosmos Lodge / 13:30||
|[[7/19>#long0719]]| Shinsuke Takasao (Nagoya University)| MHD Simulations of Accretion onto Star from Surrounding Disk|Conference room, Cosmos Lodge / 13:30||
|[[7/26>#long0726]]| Jean Coupon (University of Geneva)|Probing the galaxy-mass connection in TeraByte-scale imaging surveys|Conference room, Cosmos Lodge / 13:30||
|[[9/27>#long0927]]| Takayoshi Kusune (NAOJ)|Magnetic field of the bright-rimmed cloud SFO 74|Conference room, Cosmos Lodge / 13:30||
|[[10/03>#long1003]]| Matthew Kenworthy (Leiden Observatory)|Looking for exorings towards Beta Pictoris, J1407 and PDS 110 |Conference room, Cosmos Lodge / 13:30||
|[[10/04>#long1004]]| Yuri Aikawa (University of Tokyo)|Deuterium Fractionation in Protoplanetary Disks|Conference room, Cosmos Lodge / 13:30||
|[[10/10>#long1010]]| Peter Behroozi (University of Arizona)|Maximizing Inference from Galaxy Observations|Conference room, Cosmos Lodge / 13:30|Tuesday|
|[[10/18>#long1018]]| Ryosuke Hirai (Waseda University)|Understanding core-collapse supernovae in binaries with various numerical approaches|Conference room, Cosmos Lodge / 13:30||
|[[10/19>#long1019]]| Sergey Blinnikov (Institute for Theoretical and Experimental Physics )|GRB Central Engines within Superluminous Supernovae and their environment|Conference room, Cosmos Lodge / 13:30|Thursday|
|[[10/25>#long1025]]| Sho Fujibayashi (Kyoto University)|The evolution and mass ejection from the remnant of the binary neutron star merger|Conference room, Cosmos Lodge / 13:30||
|[[11/01>#long1101]]|No colloquium|NAOJ decadal workshop |||
|[[11/02>#long1102]]|Wanggi Lim (NAOJ)|Dust in Infrared Dark Clouds|Conference room, Cosmos Lodge / 13:30|Thursday|
|[[11/08>#long1108]]|No colloquium|DTA workshop 2017 |||
|[[11/15>#long1115]]| Sanemichi Takahashi (Kogakuin University)| Early evolution of protoplanetary disks: a ring-gap structure formation |Conference room, Cosmos Lodge / 13:30||
|[[11/22>#long1122]]| Wolfgang Loeffler (Heidelberg ARI)|Gaia Sky: A 3D visualisation of the Gaia Catalogues|Conference room, Cosmos Lodge / 13:30||
|[[11/29>#long1129]]|No colloquium|CfCA UM |||
|[[12/06>#long1206]]| Kazuyuki Sugimura (Tohoku University)| Accretion onto seed BHs: the impacts of anisotropic radiation and gas angular momentum|Conference room, Cosmos Lodge / 13:30||
|[[12/20>#long1220]]| Yutaka Hirai (NAOJ)|The role of enrichment of heavy elements in the chemodynamical evolution of dwarf galaxies|Conference room, Cosmos Lodge / 13:30||
|[[01/17>#long0117]]| Kohei Hayashi (NAOJ)|TBD|Conference room, Cosmos Lodge / 13:30||
|[[01/24>#long0124]]| Takashi Shibata (NAOJ)|TBD|Conference room, Cosmos Lodge / 13:30||
|[[02/21>#long0221]]| Kaiki Inoue (Kinki University)|TBD|Conference room, Cosmos Lodge / 13:30||
|[[02/28>#long0229]]| Kotomi Taniguchi (SOKENDAI/NAOJ)|TBD|Conference room, Cosmos Lodge / 13:30||

** Confirmed speakers [#hfb505be]


** Abstract [#id139640]

:&aname(long0413){4/13}; Tomoya Takiwaki (NAOJ DTA)  A Clockwork Supernova: precision numerical experiments and their applications|
Core-collapse supernovae are flamboyant explosions at death of massive stars.
They control the circulation of matter in the universe, and inevitably they
affect or are affected by a lot of astrophysical objects, such as supernova remnants, neutron stars, black holes, interplanetary disks and stars. The central engine of the explosion, however, remains in mystery. Elaborate numerical experiments try to uncover that. Stimulated by such precise simulations, phenomenological approaches are recently developed.In this seminar, I introduce the status of the supernova simulations and broaden applications of them.
:&aname(long0412){4/12}; Shing Chi Leung (Kavli IPMU) Nucleosynthesis of Type Ia supernovae|
Type Ia supernovae (SNe Ia) are an important class of astrophysical objects. They are the standard candles of the universe and the major sources of iron-peak elements. It is known to be the explosion of a carbon-oxygen white dwarf by thermonuclear runaways. However, many theoretical uncertainties still persist, for example whether the progenitor of SNe Ia belongs to single degenerate or double degenerate scenario. Furthermore, the diversity in observations, such as the subclasses of Type Iax or super-luminous SNe Ia, suggests that the standard picture using the explosion of a Chandrasekhar mass white dwarf is insufficient to explain the variety of the observed SNe Ia. To resolve these, a systematic understanding in SNe Ia nucleosynthesis becomes necessary. In this present, I shall present hydrodynamics and nucleosynthesis results of multi-dimensional models for the explosion phase of SNe Ia. We explore the effects of model parameters on the explosion energetic and its chemical production. The influences of our SNe Ia models to galactic chemical evolution are discussed. I also present constraints on the progenitor properties of some recently observed SNe Ia and their remnants.

:&aname(long0420){4/20}; Yuki Tanaka (NAOJ CfCA) Magnetically Driven Wind from Hot Gaseous Planets|
Several transit observations in the UV band have been suggested that hot Jupiters have high-temperature hydrogen upper atmospheres, and the existence of a large amount of atmospheric escape from the upper atmospheres. For example, a mass-loss rate from the hot Jupiter HD 209458b is estimated to be at least 10^10 g/s. It is thought that heating by the XUV radiation from central stars is the main mechanism to drive the atmospheric escape, but a driving mechanism of atmospheric escape that includes planetary magnetic fields has not been investigated so far. Here I propose a new mechanism in which the atmospheric escape is driven by the dissipation of magnetohydrodynamic (MHD) waves. I performed MHD simulations and show that the dissipation of MHD waves in the upper atmosphere can drive a large amount of atmospheric escape and also can heat up the upper atmosphere. I also discuss parameter dependence of the mass-loss rate and atmospheric structures.
:&aname(long0417){4/17}; Toshihiko Kawano (LANL/Tokyo Tech) beta-delayed neutron emission and fission for r-process nucleosynthesis|
We give a brief summary of our recent development of nuclear reaction
theories with a particular focus on nuclear data production for the
r-process nucleosynthesis. The topics include calculations of the
beta-delayed process for neutron-rich nuclei, where several neutrons
can be emitted, and eventually fission may take place as well.
Our recent studies on fission itself are also given.

:&aname(long0425){4/25}; Kohei Inayoshi (Columbia University) Hyper-Eddington accretion flows onto massive black holes|
How fast can black holes (BHs) grow?  The existence of bright quasars at high-redshift provides a challenging puzzle about the origin of supermassive BHs. To form such massive objects within a billion year, rapid growth of seed BHs is required. We study very-high rate, spherically symmetric accretion flows onto massive BHs embedded in dense metal-poor clouds. We find solutions from outside the Bondi radius at hyper-Eddington rates, unimpeded by radiation feedback. Accretion rates in this regime are steady, and larger than 5000 L_Edd/c^2. At lower rates, the accretion is episodic due to radiative feedback and the average rate is below the Eddington rate. The hyper-Eddington accretion solution is maintained as long as the emergent luminosity is limited to < (10-30) L_Edd because of photon trapping due to electron scattering. We apply our result to the rapid formation of massive BHs in protogalaxies. Once a seed BH forms at the center of the galaxy, it can grow to a maximum ~ 10^5 Msun via gas accretion independent of the initial BH mass.
:&aname(long0419){4/19}; Masaki Yamaguchi (U. Tokyo) The number of black hole-star binaries discovered by the astrometric satellite, Gaia|
Although it is believed that there are 10^8-9 stellar mass black holes (BH) in Milky Way, until now only ~60 BHs have been discovered. Moreover, masses of only a dozen BHs of them are constrained. By discovering more BHs and estimating their masses, we would obtain the mass distribution of BHs with a higher confidence level. This distribution is expected to constrain a theoretical model of the supernova explosion in which a BH is produced as a remnant.
Gaia is now operated and have a capability to detect binaries with an unseen companion, such as a BH or a neutron star. Gaia performs a high-precision astrometry with the optical band (0.3-1.0um), and surveys a whole sky, where main observational targets are stars. If a target star has an unseen companion, it should show an elliptical motion on the celestial sphere. Gaia can confirm the companion by detecting such motion. Moreover, this elliptical motion leads to all orbital elements, which enables us to estimate the mass of companion. If this mass is larger than 3 solar masses, we can confirm the companion as a BH.
In my talk, I will show how many BHs can be detected by such method with Gaia. Considering the binary evolution, we obtain the number of detectable BHs, ~600, for main sequence targets. This means that Gaia can discover the order of one thousand BHs whose masses can be found, although we know only a dozen such BHs now. We conclude that the astrometric observation for binaries is very powerful method for finding BHs.

:&aname(long0427){4/27}; Tetsuo Taki (NAOJ CfCA) Toward formation of rocky planetesimals: dust and gas density evolution at a local structure of protoplanetary disks|
The radial drift barrier is one of the most serious problem in the planetesimal formation process. We focus on a local disk structure called "radial pressure bump (Whipple, 1972; Haghighipour & Boss, 2003a, b)”. When a protoplanetary disk has the radial pressure bump, dust particles are trapped at a point where gas pressure is radially maximized. We investigate simultaneous evolution of dust and gas density profiles at a radial pressure bump. We find that the bump structure is flattened by a drag force from dust onto gas when the dust-to-gas mass ratio reaches ~1. Although the pressure bump is a favorable place for streaming instability (SI; Youdin & Goodman, 2005), the flattened bump structure inhibits SI from forming large particle clumps corresponding to 100-1000 km sized bodies, which has been previously proposed. If SI occurs there, the dust clumps formed would be 10-100 times smaller, that is, of about 1 - 100 km.
:&aname(long0426){4/26}; Tomohisa Kawashima (NAOJ) Radiation hydrodynamic simulations of super-critical accretion columns onto neutron stars in ULX-pulsars|
Ultraluminous X-ray sources are off-centered, extragalactic X-ray sources with luminosities exceeding the Eddington limit for stellar-mass black holes. After the recent discovery of pulsed X-ray emissions in three ULXs, it is widely thought that some ULXs are powered by super-critical column accretion onto neutron stars. The mechanism of super-critical column accretion is, however, still poorly understood. We have, therefore, carried out two-dimensional radiation hydrodynamic simulations of super-critical accretion columns onto neutron stars, and have found that the super-critical accretion can be realized because the most photons escape from the side wall of accretion columns (i.e., the radiation field is anisotropic in the accretion columns). The simulated accretion columns are luminous enough to be consistent with the observed ULX-pulsars.

:&aname(long0511){5/11}; Masahiro Ogihara (NAOJ DTA) Formation of close-in super-Earths|
Recent observations of exoplanets have revealed a large number of
close-in low-mass planets (or close-in super-Earths). As of April
2016, 351 systems harbor 877 close-in super-Earths. We can discuss the
origin of these planets by comparing observed orbital distributions
with results of numerical simulations of planet formation. In this
talk, I will introduce our recent papers on formation of close-in
super-Earths (Ogihara et al. 2015, A&A, 578; Ogihara et al. 2015,
A&AL, 584). I will also show some preliminary results of ongoing
projects.
:&aname(long0508){5/08}; Jonathan C. Tan (University of Florida) Inside-Out Planet Formation |
The Kepler-discovered systems with tightly-packed inner planets (STIPs), typically with several planets of Earth to super-Earth masses on well-aligned, sub-AU orbits may host the most common type of planets in the Galaxy. They pose a great challenge for planet formation theories, which fall into two broad classes: (1) formation further out followed by migration; (2) formation in situ from a disk of gas and planetesimals. I review the pros and cons of these classes, before focusing on a new theory of sequential in situ formation from the inside-out via creation of successive gravitationally unstable rings fed from a continuous stream of small (~cm-m size) "pebbles," drifting inward via gas drag. Pebbles first collect at the pressure trap associated with the transition from a magnetorotational instability (MRI)-inactive ("dead zone") region to an inner MRI-active zone. A pebble ring builds up until it either becomes gravitationally unstable to form an Earth to super-Earth-mass planet directly or induces gradual planet formation via core accretion. The planet continues to accrete until it becomes massive enough to isolate itself from the accretion flow via gap opening. The process repeats with a new pebble ring gathering at the new pressure maximum associated with the retreating dead-zone boundary. I discuss the theory’s predictions for planetary masses, relative mass scalings with orbital radius, and minimum orbital separations, and their comparison with observed systems. Finally I speculate about potential causes of diversity of planetary system architectures, i.e. STIPs versus Solar System analogs.

:&aname(long0518){5/18}; Takashi Moriya (NAOJ DTA) Superluminous supernovae and their origins|
Superluminous supernovae (SLSNe) are newly recognized class of core-collapse supernovae (SNe). Their existence is realized only about a decade ago. They are more than 10 times brighter than other core-collapse SNe. The reasons why they can become very bright are still not understood well. It is currently known that there are two distinct spectral types in SLSNe, namely, Type II (those with hydrogen features) and Type I (those without them). Type II SLSNe show narrow spectral features which are likely from dense circumstellar media surrounding the SN ejecta. I will present the numerical modeling of the collision between SN ejecta and dense circumstellar media and show that the interaction between SN ejecta and dense circumstellar media can indeed explain Type II SLSNe. Origins of Type I SLSNe are more mysterious. I will discuss several works of mine related to the luminosity source of Type I SLSNe. I will especially focus on the Type I SLSN iPTF13ehe which did not show hydrogen features at the beginning but started to show them one year after its luminosity peak. I suggest that the delayed hydrogen features may be an evidence of Type I SLSN progenitors evolving in close massive binary systems.
:&aname(long0510){5/10}; Shinpei Shibata (Yamagata University) Physics of The Rotation Powered Pulsar|
I review physics of the rotation powered pulsars with special interest of how the energy and angular momentum are emitted from the system. I will mention briefly an recent observational result that torque on the neutron stars varies with various time scales. This talk is given in Japanese.

:&aname(long0525){5/25}; Yukari Ohtani (NAOJ CfCA) Study of relation between emission of supernova shock breakout and central engine activity|
Shock breakout radiation originate as thermal emission from the shock passing through the outer layer of the star. It can provide the first information on how supernova explodes, no matter how relativistic the explosion is. There have been an question about the relativistic jet associated with a hypernova, of which explosion energy is ten times higher than that of an ordinary core-collapse supernova. The question is, how the central engine of the jet works. In order to obtain information on the central engine activity, it might be worth studying the emission properties of ultra-relativistic shock propagating into the dense circumstellar matter (CSM). For example, influence of bulk-Compton scattering on the spectrum can be a powerful indicator of the shock evolution, but there have been no theoretical study on that. In this talk, I will introduce our numerical study on the relationship between the behavior of an ultra-relativistic shock and the spectral properties of shock breakout emission. Using a Monte-Carlo method, we calculate the temporal spectral evolution of ultra-relativistic shock breakout in the CSM. We found that if the shock velocity monotonically decreases with time, photons with relatively high energies tend to appear fast. That is because the bulk kinetic energy of the shocked matter decreases. On the other hand, if the shock velocity increases with time, there are only slight changes in the spectrum. Therefore, in principle, it might be possible to obtain information on the activity of the jet central engine from the observable properties of ultra-relativistic shock breakout.
:&aname(long0517){5/17}; Tomohiro Ono (Kyoto University) Large-scale Gas Vortex Formed by the Rossby Wave Instability|
Large-scale gas vortexes induced by the Rossby wave instability (RWI) are one of the plausible explanations of the lopsided structures recently observed in several protoplanetary disks. For comparison with the observations, it is important to investigate quantitatively the properties of the vortexes formed by the RWI. However, our knowledge on the properties and outcomes of the RWI has been limited until recent years. We have studied the RWI with linear stability analyses and hydrodynamical simulations using the Athena++ code. As a result of the linear stability analyses, we show that the RWI is one of the shear instabilities which are explained by the interaction between two Rossby waves. We also derive the critical condition for the onset of the RWI in semi-analytic form. From the numerical simulations, we investigate the properties of the vortexes formed by the RWI and discuss possible observational predictions. In my talk, I will present our three results on the RWI: (1) the physical mechanism, (2) the critical condition for the onset and (3) the properties of the vortexes.

//6/1
:&aname(long0601){6/1}; Shogo Tachibana (Hokkaido University) Timing of gas clearing of the protosolar disk: Constraints from 129I-129Xe ages of solar-wind-rich meteorites|
Planets in the solar system and extrasolar planets form in protoplanetary disks, which are the natural outcome of the star formation.  The protosolar gas disk also dispersed after the formation of Jupiter and Saturn, resulting in the insufficient gas accretion onto later-formed Uranus and Neptune cores.  However, there has been no chronological constraint when the gas disk dispersed in the solar system.  Here we found that solar-wind-rich portions of gas-rich chondrite breccias are about 10 million years younger than the oldest solar system solid objects using a 129I-129Xe relative chronometer.  The solar-wind gas implantation into asteroids must have occurred in the absence of disk gas, and thus the disk gas was cleared out completely ~10 million years after the first solid formation.  This could also be the first direct constraint on the timing of the onset of Jupiter and Saturn formation as ~3 million years after the first solid formation.

//6/8
:&aname(long0608){6/8}; Alessandro Sonnenfeld (IPMU) Dark matter in early-type galaxies: a lensing view|
Dark matter halos play a crucial role in the formation and evolution of galaxies but observational constraints on the distribution of dark matter are currently very poor.Gravitational lensing is a very powerful tool for measuring galaxy masses at cosmological distances and provides a unique opportunity for probing the distribution of dark matter in the most massive galaxies.
By statistically combining the lensing signal from a large set of galaxies we explored how the average dark matter distribution correlates with the properties of the baryonic component. Strong lensing constraints reveal an anticorrelation between galaxy size and dark matter mass enclosed within 5kpc. At larger scales, probed by weak lensing, we observe a positive correlation between halo mass and the velocity dispersion of the central galaxy, at fixed stellar mass.
These results could have a significant impact on our understanding of the formation and evolution of massive galaxies.
:&aname(long0524){5/24}; Naonori Sugiyama (IPMU) Kinematic Sunyaev-Zel'dovich effect|
Over the past few years, cosmologists have been able to make the first detections of the kinematic Snuyaev-Zel'dovich (kSZ) effect by combining galaxy data with measurements from CMB experiments.  The kSZ effect is well-suited for studying properties of the optical depth of halos hosting galaxies or galaxy clusters. As the measured optical depth via the kSZ effect is insensitive to gas temperature and redshift, the kSZ effect can be used to detect ionized gas that is difficult to observe through its emission, so-called "missing baryons".  This work presents the first measurement of the kSZ effect in Fourier space.  While the current analysis results in the kSZ signals with only evidence for a detection, the combination of future CMB and spectroscopic galaxy surveys should enable precision measurements. This talk emphasizes the potential scientific return from these future measurements.

:&aname(long0531){5/31}; Shogo Ishikawa (NAOJ CfCA) The Galaxy-Halo Connection in High-redshift Universe |
We present the results of clustering analyses of Lyman break galaxies
(LBGs) at z~3, 4, and 5 using the final data release of the
Canada&#8211;France&#8211;Hawaii Telescope Legacy Survey (CFHTLS). Deep- and
wide-field images of the CFHTLS Deep Survey enable us to obtain
sufficiently accurate two-point angular correlation functions to apply
a halo occupation distribution analysis. The mean halo masses increase
with the stellar-mass limit of LBGs. Satellite fractions of dropout
galaxies, even at less massive halos, are found to drop sharply, from
z=2 down to less than 0.04, at z=3-5, suggesting that satellite
galaxies form inefficiently even for less massive satellites. We
compute stellar-to-halo mass ratios (SHMRs) assuming a main sequence
of galaxies, which is found to provide SHMRs consistent with those
derived from a spectral energy distribution fitting method. The
observed SHMRs are in good agreement with model predictions based on
the abundance-matching method, within 1sigma confidence intervals. We
derive observationally, for the first time, the pivot halo mass, which
is the halo mass at a peak in the star-formation efficiency, at 3<z<5,
and it shows a small increasing trend with cosmic time at z>3. In
addition, the pivot halo mass and its normalization are found to be
almost unchanged during 0<z<5. Our study provides observational
evidence that galaxy formation is ubiquitously most efficient near a
halo mass of 10^12Msun over cosmic time.

// 6/15
:&aname(long0615){6/15}; Makoto Takamoto (University of Tokyo) Relativistic Magnetohydrodynamic turbulence in Poynting-Dominated Plasmas and its effects on Current Sheet Dynamics|
Many astrophysical phenomena are considered that the ambient plasma is very high-Reynolds number flows, and should be in a turbulent state. In particular, many high energy astrophysical phenomena are also believed to be in high-sigma state, that is, the plasma is in a Poynting-dominated state. To investigate such phenomena, we need a theory of turbulence of relativistic magnetohydrodynamics (RMHD) with relativistically strong background magnetic field. However, there are very few study of relativistic turbulence, and many properties are still unknown.
In this seminar, we report on our recent findings of the RMHD turbulence in a Poynting-dominated plasma, in particular, effects of compression mode. We performed a series of 3-dimensional RMHD simulations with decaying trans-Alfvenic turbulence. We found that the generation of compressible mode shows different behavior from non-relativistic case, such as an increase of compression mode power with back ground sigma parameter and effects from shock waves. We also discuss the turbulent effects on magnetic reconnection.
:&aname(long0607){6/7}; Tomoya Kinugawa (U. Tokyo) compact binary remnants from first stars for the gravitational wave source|
Using our population synthesis code, we found that the typical chirp mass of binary black holes (BH-BHs) whose origin is the first star (Pop III) is ~30 Msun. This result predicted the gravitational wave events like GW150914 and LIGO paper said "recently predicted BBH total masses agree astonishingly well with GW150914 and can have sufficiently long merger times to occur in the nearby universe (Kinugawa et al. 2014)" (Abbot et al. ApJL 818,22 (2016)). Thus, the compact binary remnants of the first stars are interesting targets of LIGO,VIRGO and KAGRA.Nakano, Tanaka & Nakamura 2015 show that if S/N of QNM is larger than 35, we can confirm or refute the General Relativity more than 5 sigma level. In our standard model, the detection rate of Pop III BH-BHs whose S/N is larger than 35 is 3.2 events/yr (SFR_p/(10^{-2.5}Msun/yr/Mpc^3))*([f_b/(1+f_b)]/0.33)* Err_sys. Thus, there is a good chance to check whether GR is correct or not in the strong gravity region. Furthermore, the Pop III binaries become not only BH-BH but also NS-BH. We found Pop III NS-BH merger rate is ~ 1 events/Gpc^3 and the chirp mass of Pop III NS-BH is more massive than that of Pop I and II. Therefore, we might get information of Pop III stars from massive BH-BHs and NS-BHs.

//6/22
:&aname(long0622){6/22}; Takahiro Sumi (Osaka University) Microlensing exoplanet search toward the solar system analog|
Although thousands of exoplanets have been found by various methods,
not many solar system planets analogs have been detected.
Some Jupiter and Saturn analogs and a few Earth-like plants have been found only very recently.
Gravitational microlensing has an unique sensitivity to exoplanets outside the snow-line
down to the Earth-mass, where the planetary formation is very active. 
The MOA-II and OGLE-IV carries out microlensing exoplanet search toward the
Galactic Bulge in New Zealand and Chile, respectively.
These surveys are detecting various kinds of systems, including the Jupiter-Saturn analog, 
the Neptune analog and the 2-Earth mass planet at 1AU around one of the binary stars.
The Wide Field Infrared Survey Telescope (WFIRST) is the NASA's future large space mission,
which is scheduled to be launched in 2024.
The exoplanet microlensing program is one of the primary science of WFIRST. 
WFIRST will find about 3000 bound planets and 2000 unbound planets by the high
precision continuous survey with 15 min. cadence, which is sensitive to all the solar system 
analogs except the mercury.  WFIRST can complete the statistical census of
planetary systems in the Galaxy, from the outer habitable zone to the outside of the snow-line 
and gravitationally unbound planets &#8211; a discovery space inaccessible to other exoplanet detection techniques.

:&aname(long0612){6/12}; Yama&#231; Pehlivan  (Mimar Sinan University)	 Stars as extreme laboratories for neutrino physics|
Neutrinos are the second most abundant particle species in the universe after
the photons. Due to their small cross sections, their last point of scattering
(and hence their memory) lies deep within dense astrophysical objects. As a new
observational window to the Universe, neutrinos hold a great potential. But, an
equally exciting possibility is to use these observations as a probe to their
minuscule properties under the Universe's most extreme conditions.In this talk, I will focus on the neutrinos emitted by core collapse supernova
where, in the deep regions, neutrino-neutrino interactions turn their flavor
oscillations into a nonlinear many-body phenomenon. Various tiny neutrino
properties can be amplified by these nonlinear effects with detectable
consequences. These can show themselves directly in a future galactic supernova
signal detected by Super-Kamiokande, or indirectly (through their effect on
nucleosynthesis) in elemental abundance surveys by Subaru and TMT.

//6/29
:&aname(long0629){6/29}; Carmen Adriana Mart&iacute;nez Barbosa (Leiden Observatory, University of Leiden) Tracing the journey of the Sun and the solar siblings through the Milky Way|
The products of radioactive elements found in the meteorite fossil record and the high eccentricities of objects located in the outer regions of the Solar System, suggest that the Sun was born in an open cluster 4.6 Gyr ago. Such an open cluster however, was quickly destroyed by the intense gravitational field of the Galaxy. As a conse- quence, the stars that were born together with the Sun, the so-called solar siblings, might be currently dispersed all over the Galactic disk.~
In this talk I will explain how open cluster simulations can help us in predicting the current phase-space coordinates of the solar siblings. These simulations include the gravitational forces within the cluster, the effects of stellar evolution on the cluster population and the gravitational force due to the Milky Way. The result of these sim- ulations will serve as a guide to search for solar siblings in future surveys such as the Gaia mission and GALAH. The identification of solar siblings is of crucial importance to understand the environment where the Solar system was formed and the place in the Galaxy where the Sun was born.

:&aname(long0706){7/06}; Shota Kisaka (Aoyama Gakuin University) Engine-powered macronovae|In 2015, a gravitational-wave (GW) signal was directly detected from a merger of a binary black hole (BH) for the first time. GW signals are expected to be generated not only by mergers of binary BHs, but also by mergers of neutron star (NS) binaries (NS-NS and BH-NS binaries). NS binary mergers may also power bright electromagnetic (EM) signals, because the ejection of normal matter during mergers is thought to be responsible. EM counterparts have been focused on to maximize the scientific return from the detection of GWs. One of the most promising EM signatures are macronovae (or kilonovae): approximately isotropic emissions from heated merger ejecta. Although the r-process radioactivity is widely discussed as an energy source, it requires a huge mass of ejecta from a NS binary merger to explain the observed macronova candidates. As an alternative, we propose that macronovae are energized by the central engine, i.e., a BH or NS, and the injected energy is emitted. The engine model allows a wider parameter range, especially smaller ejecta mass than the r-process model. We also discuss the implications for the engine-powered model for the search of EM counterparts to GWs.
:&aname(long0614){6/14}; Cemsinan Deliduman (Mimar Sinan University) Astrophysics with Weyl Gravity|
This talk will introduce an attempt to describe the diverse astrophysical phenomena via Weyl gravity. In the first part I will review my work on the resolution of the flat galactic rotation curve problem via geometry instead of assuming the existence of dark matter. Motivation for this work came from the observation that the scale independence of the rotational velocity in the outer region of galaxies could point out to a possible existence of local scale symmetry and therefore the gravitational phenomena inside such regions should be described by the unique local scale symmetric theory, namely Weyl’s theory of gravity. Solution to field equations of Weyl gravity will determine the special geometry of the outer region of galaxies. In the second part of the talk it will be conjectured that this special geometry could be valid up to the scale of galaxy clusters. Then one challenge of this approach will be to explain gravitational lens characteristics of galaxy clusters by Weyl geometry without assuming existence of dark matter. Research in this direction will be summarized.

// 7/13
:&aname(long0713){7/13}; Tomoaki Matsumoto (Hosei University) Theoretical Models of Protostellar Binary and Multiple Systems with AMR Simulations.|We present theoretical models for protostellar binary and multiple systems based on the high-resolution numerical simulation with an adaptive mesh refinement (AMR) code, SFUMATO.  The recent ALMA observations reveal early phases of the binary and multiple star formation with high spatial resolutions.  The observations should be compared with theoretical models with also high spatial resolutions.  We present two theoretical models for (1) a high density molecular cloud core, MC27, and (2) a protobinary system, L1551 NE.  For the model for MC27, we performed numerical simulations for gravitational collapse of a turbulent cloud core. The cloud core exhibits fragmentation during the collapse, and dynamical interaction between the fragments produces an arc-like structure, which is one of the prominent structures observed by ALMA.  The effects of the magnetic field are also discussed with MHD simulations. For the model for L1551 NE, we performed numerical simulations of gas accretion onto protobinary.  The simulations exhibit asymmetry of circumbinary disks.  Such asymmetry was also found by ALMA in the circumbinary disk of L1551 NE.

// 8/24
:&aname(long0824){8/24}; Hui Jiang (Shanghai Maritime University)  Local Nuclear Mass Relations |The masses are the basic properties of atomic nuclei. In this talk, we will discuss the Garvey-Kelson mass relations as one of the best example schemes of local nuclear mass relations and, report in particular our recent results of researches which we have carried out in the Shanghai Jiao Tong University. The essential point is how to use and improve the Garvey-Kelson relations. We plan to apply our result to explosive nucleosynthesis in SNe.
:&aname(long0621){6/21}; Hiroyuki Kurokawa (ELSI, Tokyo Tech) Hydrodynamics of first atmospheres of planets embedded in protoplanetary disk|
Exoplanet observations revealed that a significant fraction of Sun-like stars harbor super-Earths, here defined as those objects having masses between a few to ~20 Earth masses. Though their masses overlap with the range of core masses believed to trigger runaway accretion of disk gas, these super-Earths retain only small amounts of gas: ~1%-10% by mass. How did super-Earths avoid becoming gas giants? One possible solution is late-stage core formation; super-Earths were formed by the final assembly of proto-cores during disk dispersal (Lee et al. 2014). Another solution is rapid recycling of envelope gas. Ormel et al. (2015) conducted hydrodynamical simulations of isothermal flow past a low-mass planet embedded in disk gas. They found that the atmosphere (inside the Bondi sphere) is an open system where disk gas enters from high latitude (inflow) and leaves through midplane region (outflow). They argued that the recycling is faster than the cooling (namely, the contraction) of the envelope gas, and so that further accretion of disk gas is prevented. To evaluate the influence of the cooling process on the recycling process, we performed non-isothermal hydrodynamical simulations of the flow around an embedded planet, where radiative cooling was approximated by the beta cooling model. We found that the recycling is limited in the non-isothermal cases because of the difference in entropy between the inflow (high entropy) and the atmosphere (low entropy). The high entropy flow cannot penetrate the low-entropy atmosphere, and therefore the recycling is limited to the upper region of the Bondi sphere. Our results suggest that the recycling process may not be able to explain the ubiquity of super-Earths. Nevertheless, the midplane outflow induced by the recycling may prevent or reduce the accretion of pebbles onto proto-cores. This would delay the growth of these cores and help us to explain the ubiquity of super-Earths in the context of the late-stage core-formation scenario.

// 8/31
:&aname(long0831){8/31}; Sherry Suyu (MPA)  Shedding Light on the Dark Cosmos through Gravitational Lensing| Gravitational lensing provides powerful means to study dark energy and dark matter in the Universe.  In particular, strong lens systems with measured time delays between the multiple images can be used to determine the "time-delay distance" to the lens, which is primarily sensitive to the Hubble constant.  Measuring the Hubble constant is crucial for inferring properties of dark energy, spatial curvature of the Universe and neutrino physics.  I will describe the ingredients and newly developed techniques for measuring accurately time-delay distances with a realistic account of systematic uncertainties.  A program initiated to measure the Hubble constant to <3.5% in precision from gravitational lens time delays is in progress, and I will present the latest results and their implications.  Current and upcoming imaging surveys will contain thousands of new time-delay lenses, and I will describe ongoing efforts to find these objects.  An exciting discovery is the first strongly lensed supernova, which has offered a rare opportunity to perform a true blind test of model predictions.  I will describe the bright prospects of using gravitational lens time delays as an independent and competitive cosmological probe.
:&aname(long0628){6/28}; Masanobu Kunitomo (Nagoya University) Revisiting the pre-main sequence evolution of low-mass stars: Importance of accretion and deuterium|
Recent theoretical work has shown that the pre-main sequence (PMS) evolution of stars is much more complex than previously envisioned: Instead of the traditional one-dimensional solution of the contraction of a spherically symmetric gaseous envelope, protostars grow from the first formation of a small seed and subsequent accretion of material. This material is shocked, accretion may be episodic and not necessarily symmetrical, thereby affecting the energy deposited inside the star and its interior structure. Given this new framework, we confirm the findings of previous works (e.g., Baraffe et al. 2009, 2012, Hosokawa et al. 2011) that the evolution changes significantly with the amount of energy that is lost during accretion. We find that deuterium burning also regulates the PMS evolution. In the low-entropy accretion, the evolutionary tracks in the Hertzsprung-Russell diagram are significantly different from the classical ones and sensitive to the deuterium content. Our results agree with previous work that the variation of heat injection can be the solution of luminosity spread problem of PMS stars and show the importance of the deuterium content. We also discuss the internal structure evolution of young stars and the impact on the stellar surface composition.

//10/5
:&aname(long1005){10/5}; Toshio Fukushima (NAOJ) Numerical integration of gravitational field for general three-dimensional objects and its application to gravitational study of grand design spiral arm structure|
We present a method to integrate the gravitational field for general three-dimensional objects. By adopting the spherical polar coordinates centered at the evaluation point as the integration variables, we numerically compute the volume integral representation of the gravitational potential and of the acceleration vector. The variable transformation completely removes the algebraic singularities of the original integrals. The comparison with exact solutions reveals around 15 digits accuracy of the new method. Meanwhile, the 6 digit accuracy of the integrated gravitational field is realized by around $10^6$ evaluations of the integrand per evaluation point, which costs at most a few seconds at a PC with Intel Core i7-4600U CPU running at 2.10 GHz clock. By using the new method, we show the gravitational field of a grand design spiral arm structure as an example. The computed gravitational field shows not only spiral shaped details but also a global feature composed of a thick oblate spheroid and a thin disc. The developed method is directly applicable to the electromagnetic field computation by means of Coulomb's law, the Biot-Savart law, and their retarded extensions. Sample {\sc fortran} 90 programs and test results are electronically available. (Ref. T. Fukushima 2016, MNRAS, doi:10.1093/mnras/stw2078)

:&aname(long0705){7/5}; Yuta Asahina (NAOJ CfCA) MHD Simulations of the Feedback via an AGN outflow to the inhomogenious interstellr medium|
Co-evolution between central supermassive black holes and host galaxies is a hotly debated issue in astrophysics. Outflows are thought to have an impact of the interstellar medium (ISM), and probably be responsible for the establishment of a widely known correlation between black hole mass (M) and the stellar velocity dispersion in galactic bulge (σ), so-called M-σ relation. Feedback by the quasar wind has been investigated by Silk & Rees (1998),  Fabian (1999), and King (2003). However the quasar winds are assumed to be spherical symmetric outflows.  Wagner et al. (2012) studied the feedback via AGN jets. They revealed that the feedback via the AGN jet can be origin of M-σ relation. Magnetic fields are not included in their simulations, although magnetic fields of 0.01-1 mG have been reported to exist in the galactic center. In order to study the effect of the magnetic field to the feedback via the AGN jet, we carry out 3D MHD simulations. Our simulations reveal that the magnetic tension force promotes the acceleration of the ISM and enhances the feedback efficiency.



:&aname(long0712){7/12}; Shoko Oshigami (NAOJ CfCA) Mare volcanism: Reinterpretation based on Kaguya Lunar Radar Sounder data|
The Lunar Radar Sounder (LRS) onboard Kaguya (SELENE) detected widespread horizontal reflectors under some nearside maria. Previous studies estimated that the depths of the subsurface reflectors were up to several hundreds of meters and suggested that the reflectors were interfaces between mare basalt units. The comparison between the reflectors detected in the LRS data and surface age maps indicating the formation age of each basalt unit allows us to discuss the lower limit volume of each basalt unit and its space and time variation. We estimated volumes of basalt units in the ages of 2.7 to 3.8 Ga in the
nearside maria. The lower limit volumes of the geologic units estimated in this study were on the order of 10^3 to 10^4 km^3. This volume range is consistent with the total amount of erupted lava flows derived from numerical simulations of thermal erosion models of lunar sinuous rille formation and is also comparable to the average flow volumes of continental flood basalt units formed after the Paleozoic and calculated flow volumes of Archean komatiite flows on the Earth. The lower limits of average eruption rates estimated from the unit volumes were on the order of 10 ^5 to 10^ 3 km^3/yr. The estimated volumes of the geologic mare units and average eruption rate showed clear positive correlations with their ages within the same mare basin, while they vary among different maria compared within the same age range. This talk is given in Japanese.


:&aname(long0726){7/26}; Jean Coupon (University of Geneva): Probing the galaxy-mass connection in TeraByte-scale imaging surveys|
The past decade has seen the emergence of new techniques and exciting discoveries powered by wide-field imaging surveys from the UV to the near-IR domain. Owing to gravitational lensing, galaxy clustering and abundance matching (to name but a few), coupled with advanced statistical interpretation, the informative power of astronomical imaging surveys has significantly increased. In particular, the connection between galaxies and dark matter, a keystone in cosmology and the study of galaxy evolution, has widely gained from this "scale revolution" and the future is bright, as the next experiments such as HSC, LSST, Euclid or WFIRST are dedicated "survey" machines that will further increase imaging data by orders of magnitude (without mentioning the tremendous gain in image resolution, time domain and deep near-IR imaging). I will focus my talk on reviewing the main techniques to connect galaxies and dark matter in the context of wide-field surveys and I will show some concrete examples of applied data analysis in the CFHTLenS and COSMOS projects, showing that these techniques are now well proven, although the challenges in reducing some critical systematic uncertainties are ahead of us.

:&aname(long0927){9/27};  Takayoshi Kusune (NAOJ): Magnetic field of the bright-rimmed cloud SFO 74|
Magnetic fields are believed to play an important role in the formation and evolution of molecular cloud. In this talk, I will present the results of near-infrared polarimetric observations toward a bright-rimmed cloud (SFO 74). Bright-rimmed clouds, which are small molecular clouds located at the periphery of the HII regions, are considered to be potential sites for induced star formation by UV radiation from nearby OB stars. The obtained polarization vector maps clearly show that the plane-of-sky (POS) magnetic field structure inside the cloud is quite different from its ambient POS magnetic field direction. By applying the Chandrasekhar-Fermi method, I estimate the POS magnetic field strength toward the two regions inside the cloud. Our results indicate that the magnetic field (configuration and strength) of SFO 74 is affected by the UV-radiation-induced shock. I will discuss the relationship between the POS magnetic field and the cloud structure. 


:&aname(long1003){10/03};  Matthew Kenworthy (Leiden Observatory) : Looking for exorings towards Beta Pictoris, J1407 and PDS 110|
Circumplanetary disks are part of the planet and moon formation
process, passing from an optically thick regime of gas and dust
through to a planet with retinue of moons and Roche lobe rings formed
from the accreted material. There should therefore be a transitional
phase where moons are beginning to form and these will clear out lanes
in the circumplanetary disk, producing Hill sphere filling 'rings'
hundreds of times larger than Saturn's rings.
We have seen evidence of these objects transiting their young star -
with J1407, and more recently, with the young star PDS 110. This star
shows periodic eclipses lasting over two weeks of up to 30% in depth,
and the next eclipse is predicted to occur in September this year. The
star is 10th magnitude in the belt of Orion, and can be followed in
the early morning skies from most places on Earth.
We are also following the Hill sphere transit of Beta Pictoris b, a
gas giant planet around a nearby bright star, and I will also present
the latest light curves from this experiment.

:&aname(long1004){10/04};  Yuri Aikawa (University of Tokyo): Deuterium Fractionation in Protoplanetary Disks|
Deuterium enrichments in molecules are found in star-forming regions, as well as in Earth’s ocean. Asrtrochemical models show that the enrichment originates in exothermic exchange reactions at low temperatures, which could proceed not only in molecular clouds, but also in the cold regions of protoplanetary disks. In recent years, several groups observed deuterated molecules in disks using ALMA, in order to investigate the significance and spatial distribution of the fractionation. Brightness distributions of deuterated molecular lines vary with species and objects. In TW Hya, DCN is centrally peaked, while DCO+ is offset from the center, which suggests that they are formed via different deuteration paths. In AS 209, on the other hand, DCO+ and DCN emissions show similar distribution. Motivated by these observations, we calculate the reaction network model of deuterium chemistry in protoplanetary disks. Our model includes various deuterated molecules, exchange reactions, and nuclear spin-state chemistry of H2 and H3+, which affects the efficiency of deuterium enrichment. We found that the exchange reaction responsible for the fractionation varies among regions. While the exchange reactions of HD with H3+ and CH3+ are effective, as expected, the exchange reaction of D atom with HCO+ is also found to be important in warm regions and disk surface. As long as cosmic rays penetrate the disk, ortho/para ratio of H2 is found to be almost thermal, which lowers the efficiency of fractionation via CH2D+ compared with previous models which assume that H2 is all in para state. We also discuss the effects of grain size and turbulent mixing on deuterium chemistry.

:&aname(long1010){10/10}; Peter Behroozi (University of Arizona): Maximizing Inference from Galaxy Observations|
I discuss new methods to combine multiple datasets to maximally constrain galaxy evolution and the galaxy―dark matter halo connection, and show how these methods have already changed our understanding of galaxy formation physics (including why galaxies stop forming stars).  Basic extensions to the same techniques allow constraining internal galaxy processes, including coevolution between galaxies and supermassive black holes as well as time delays for supernova / GRB progenitors.  Finally, I discuss how these methods will benefit from the enormous amount of upcoming data in widefield (HETDEX, LSST, Euclid, WFIRST) and targeted (JWST, GMT) observations, as well as ways they can benefit observers, including making predictions for future telescopes (especially JWST) and testing which of many possible targeted observations would best constrain galaxy formation physics.

:&aname(long1018){10/18}; Ryosuke Hirai (Waseda University ): Understanding core-collapse supernovae in binaries with various numerical approaches|
Compact binaries have rapidly attracted attention since the recent detection of gravitational waves from a binary black hole merger event. The two components should have originated from massive stars which experience core-collapse at the end of their lives. However, the evolution of massive stars are extremely uncertain and the presence of a close-by companion complicates it even more. A close binary can undergo mass transfer by overflowing its Roche lobe, or dynamical evolution called common envelope phases when a star plunges into the envelope of the other. Another possible effect is the direct impact of supernova ejecta colliding with its companion when one of the star explodes.
In this talk I will discuss the consequence of the "ejecta-companion interaction", using hydrodynamical simulations and stellar evolution calculations. Our results have coincidentally helped us understand the nature of the progenitor system of a supernova called iPTF13bvn. I will also discuss the overall evolution of this progenitor system. If I have time, I will also introduce some of my latest works on numerical techniques.

:&aname(long1019){10/19}; Sergey Blinnikov (Institute for Theoretical and Experimental Physics ): GRB Central Engines within Superluminous Supernovae and their environment|
Large amounts of mass may be expelled by a star  a few years before a supernova explosion. The collisions of SN-ejecta and the dense CSM  may provide the required power of light to make the supernova much more luminous. This class of models is referred to as "interacting SNe”. Many SLSNe-I have photospheric velocity of order 10&#8308; km/s which is hard to explain in interacting scenario with modest energy of explosion. A strong "hypernova" explosion improves the situation and the properties of  SLSNe near maximum light are explained by a GRB-like central engine, embedded in a dense envelope and shells ejected prior the final collapse/explosion of a massive star. In this case velocity up to 1.5x10&#8308; km/s is no problem. The problem remains with the nature of the central engine and evolution scenarios leading to double explosions. In view of new LIGO/VIRGO detections of gravitational waves and accompanying events, a few comments and historical remarks will be given.

:&aname(long1025){10/25}; Sho Fujibayashi (Kyoto University ): The evolution and mass ejection from the remnant of the binary neutron star merger|
We perform general relativistic, long-term, axisymmetric neutrino
radiation hydrodynamics simulations for a remnant massive neutron star
(MNS) surrounded by a torus, which is a canonical remnant formed after
the binary neutron star merger.
In this work, we take into account effects of viscosity which is
likely to arise in the merger remnant due to magnetohydrodynamical
turbulence.
We find that two viscous effects play a key role for the evolution of
the remnant system and resulting mass ejection.
In the first ~10 ms, the structure of the MNS is changed due to the
viscous angular momentum transport. As a result, a sound wave, which
subsequently becomes a shock wave, is formed in the vicinity of the
MNS and the shock wave leads to significant mass ejection.
For the longer-term evolution with ~ 0.1--10 s, viscous effects on the
torus surrounding the MNS play an important role for mass ejection.
The mass ejection rate depends on the viscous parameter for both mass
ejection mechanisms, but even for the conservative alpha viscous
parameter $\alpha_{\rm vis}\sim0.01$, total ejecta mass is $\sim
5\times 10^{-3}\ M_\odot$ and for $\alpha_{\rm vis}\sim0.04$, it could
be $0.02\ M_\odot$.
In this talk, I will explain the viscosity-driven mass ejection
processes and discuss the electromagnetic signal from the ejecta.

:&aname(long1102){11/02}; Wanggi Lim (NAOJ): Dust in Infrared Dark Clouds|
The dust grains play key roles to determine physical properties of
dense molecular structures. Despite of their importance, our knowledge
toward dust properties is mostly dependent on experimental tests and
theoretical models due to observational limits on high extinction
regions. Here we introduce Mid, Far and Spectroscopic infrared
extinction (MIREX, FIREX & SIREX) mapping methods that show the first
observational evidence of grain growth in extremely high density
regions, i.e. Infrared Dark Clouds. We utilize archival image data of
Spitzer-IRAC band 1-4 (3.5 - 8μm), WISE band 3 (12μm), Spitzer-MIPS
(24μm) and Herschel-PACS (70μm) in order to make MIREX & FIREX maps of
an IRDC, G028.07+00.07. Spectroscopic data of Spitzer-IRS Long-Low
slit (15 to 38μm) is analyzed to produce a SIREX map of same IRDC. The
pixel by pixel relative extinction laws of the IRDC show the tentative
evidence of dust grain growth via coagulation and ice mantle formation
in the region of Av~10-100mag. We then compare mass surface density
probability distribution functions (Σ-PDFs) of the IRDC and
surrounding giant molecular cloud (GMC) that are derived from MIREX
map (8μm) and sub-mm (Herschel 160-500μm) dust emission based Σ map
(via grey-body fit). The PDFs can be well fit by a single log-normal
distribution, with only a small mass fraction (0.03-0.08) in a high Σ
power-law tail, even though gas kinematics indicate the IRDC and GMC
are self-gravitating with virial parameter α~1. We also show the
effect of spectral index β variation against the mass fraction of
high-Σ power-law tails.

:&aname(long1115){11/15}; Sanemichi Takahashi (Kogakuin University): Early evolution of protoplanetary disks: a ring-gap structure formation |Planets are formed in protoplanetary disks, which are formed around
protostars simultaneously with them. Investigation of the early stages
of evolution of the protoplanetary disks is important to understand
how the star formation and the planet formation processes are
connected.
Recent observations with ALMA reveal the detailed structures of the
protoplanetary disk at the early evolutionary stage. Sheehan and
Eisner 2017 found that the gap structure is formed in the
protoplanetary disk the protostar WL 17 within about 10 au. Such a
structure is thought to be the feature of the old disks (>10^6 yr)
called by transition disks. However, the age of WL 17 is estimated to
be a few times 10^5 yr. The mechanisms of the gap formation in such
young disks have not been investigated well.
Sheehan and Eisner 2017 mentioned that the gap structure is formed by
the planet. However, the planets forming the gap have not been
observed, and it seems difficult to form the planet in the young
protoplanetary disks. Thus, it is important to investigate another
mechanism for the gap formation in the young disk. In this talk, we
discuss the gap formation by the disk wind in the young disks like WL
17 using 1D disk model for the formation and evolution of
protoplanetary disks.


:&aname(long1122){11/22}; Wolfgang Loeffler (Heidelberg ARI): Gaia Sky: A 3D visualisation of the Gaia Catalogues|
The aim of the ESA Gaia mission is to chart the three-dimensional
positions and motions of about 1 billion stars in our Milky Way. Gaia
Sky is an open-source, multi-platform, real-time, 3D, astronomy
software being developed in the Gaia group of the Astronomisches
Rechen-Institut (ZAH, Universit&#228;t Heidelberg) to visualise these
positions and motions. We will give an overview of the software
features and catalogues which have already been released for the Gaia
Data Release 1 and which are under current development for the Gaia
Data Relase 2. After briefly touching some technical aspects of the
Gaia Sky implementation, we will present some educational and
scientific use cases.

:&aname(long1206){12/06}; Kazuyuki Sugimura (Tohoku University): Accretion onto seed BHs: the impacts of anisotropic radiation and gas angular momentum|
Seed black hole (BH) growth by gas accretion is supposed to play a crucial role in the formation of supermassive BHs. In this talk, I will present the results of our simulations of accretion onto seed BHs under radiation feedback and explain the impact of anisotropic radiation and gas angular momentum on the accretion flow. Then, I will shortly discuss the growth of Pop III remnant BHs based on our findings.

:&aname(long1220){12/20}; Yutaka Hirai (NAOJ): The role of enrichment of heavy elements in the chemodynamical evolution of dwarf galaxies|
Recent astronomical observations have shown that there are large star-to-star scatters in the abundances of r-process elements and increasing trend of Zn in extremely metal-poor stars. However, it is not yet clear how the early chemo-dynamical evolution of the building blocks of the Milky Way halo affect the abundances of heavy elements. In this talk, we show that high-resolution N-body/smoothed particle hydrodynamics simulations of dwarf galaxies. We find that galaxies with star formation rates less than 0.001 Msun per year reproduce the observed abundances of r-process elements. On the other hand, r-process elements appear at a higher metallicity in galaxies with star formation rates greater than 0.01 Msun per year. We also find that the ejecta from electron-capture supernovae contribute to stars with [Zn/Fe] > 0.5. The scatters of heavy elements mainly come from the inhomogeneity of the metals in the interstellar medium. We find that timescale of metal mixing is less than 40 Myr. This timescale is lower than that of typical dynamical times of dwarf galaxies. Our results demonstrate that the future observations of r-process elements in extremely metal-poor stars will be able to constrain the early chemo-dynamical evolution of the Local Group galaxies. 

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