Home > Solar and Space Plasma (SSP) Seminar | 太陽系小天体セミナー | 理論コロキウム | 総研大コロキウム | 赤外ゼミ > 2017.10.16-10.22

2017.10.16-10.22

10月17日(火)13:30~15:00 太陽系小天体セミナー            南棟2階会議室
Oct 17 tue            Solar System Minor Body Seminar   Conference Room, South Bldg.2F

10月18日(水)10:30~12:00 総研大コロキウム               講義室
Oct 18 wed            SOKENDAI colloquium          Lecture Room

10月18日(水)13:30~14:30 理論コロキウム                コスモス会館会議室
Oct 18 wed            DTA colloquium              Conference Room, Cosmos Lodge

10月19日(木)13:30~14:30 理論コロキウム                コスモス会館会議室
Oct 19 thu            DTA colloquium               Conference Room, Cosmos Lodge

10月20日(金)10:30~12:00 赤外ゼミ                    ALMA棟102室
Oct 20 fri             Infrared Seminar              ROOM102 ALMA Bldg.

10月20日(金)13:30~15:00 太陽天体プラズマセミナー         院生セミナー室
Oct 20 fri             Solar and Space Plasma Seminar   Student Seminar Room, Subaru Bldg.

10月20日(金)16:00~17:00 国立天文台談話会             大セミナー室  
Oct 20 fri             NAOJ Seminar               Large Seminar Room 

詳細は以下をご覧下さい。

10月17日(火)

キャンパス
三鷹
セミナー名
太陽系小天体セミナー
定例・臨時の別
定例
日時
10月17日(火曜日)13時30分~15時
場所
南棟2階会議室

連絡先
 名前:渡部潤一

備考
テレビ会議またはスカイプによる参加も可

10月18日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Regular
Date and time
October 18, 2017, 10:30 -12:00

Place
Lecture Room

Speaker1
Hiroshi Kobayashi
Affiliation
SOKENDAI: D3 (Supervisor : Ken Ohsuga) Title:Three-Dimensional Structure of Clumpy Outflow from Supercritical Accretion Flow onto Black Holes

Speaker2
Noriharu Watanabe
Affiliation
SOKENDAI: M2 (Supervisor : Motohide Usuda, Norio Narita) Title:Doppler Tomographic Measurement for Planetary Orbital Obliquity

Facilitator
-Name:Nagaaki Kambara

Comment
TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.

10月18日(水)

Campus
Mitaka
Seminar
DTA colloquium
Regularly Scheduled
Date and time
Oct. 18 2017, 13:30-14:30
Place
Conference Room, Cosmos Lodge
Speaker
Ryosuke Hirai
Affiliation
Waseda University
Title
Understanding core-collapse supernovae in binaries with various numerical approaches
Abstract
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.

Facilitator
-Name:Tomoya Takiwaki

Comment
in English

10月19日(木)

Campus
Mitaka
Seminar
DTA colloquium
Sporadic
Date and time
Oct. 19 2017, 13:30-14:30
Place
Conference Room, Cosmos Lodge
Speaker
Sergey Blinnikov
Affiliation
Institute for Theoretical and Experimental Physics
Title
GRB Central Engines within Superluminous Supernovae and their environment
Abstract
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? 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 1.5×10? 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.
Facilitator
-Name:Tomoya Takiwaki

Comment
in English

10月20日(金)

キャンパス
三鷹
セミナー名
赤外ゼミ
定例・臨時の別
定例
日時
10月20日(金曜日)10:30~12:00
場所
ALMA棟102室
講演者
鵜山 太智 (東大)
タイトル
超補償光学を用いない直接撮像法についての考察
連絡先
-名前:大宮正士・石川裕之

備考
後半11:30~12:00には新着論文の情報交換です。
   ZOOM、TV会議システムでの参加も可能です。

10月20日(金)

Campus
Mitaka
Seminar
Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic
Regular
Date and time
20 October (Fri), 13:30-15:00
Place
Student Seminar Room, Subaru Bldg.
Speaker
Angelos Vourlidas
Affiliation
APL/JHU
Title
The Solar Eruptive Event: A Synthesis of CMEs, Flares, and Energetic Particle Production
Abstract
Solar eruptive activity suffers from a split personality syndrome. It has long been studied through flares as explosive release of radiation and Coronal Mass Ejections (CMEs) as explosive release of mass. Both phenomena have important consequences for the heliosphere and the terrestrial space environment. Both of them are associated with Solar Energetic Particles (SEPs). Both of them have large, dedicated research communities with dedicated instrumentation, analysis techniques, and nomenclature. But are these two phenomena really that different?
Over the last few years, observations from new solar missions (STEREO, SDO, Hinode) are challenging the dualist paradigm of solar eruptive activity. In this talk, I will attempt to provide a unifying description of eruptive activity that brings flares, CMEs, and SEPs into a coherent (and hopefully, simpler) picture and discuss the outlook and challenges for future missions, particularly the upcoming Parker Solar Probe.

Facilitator
-Name:Shin Toriumi

Comment

10月20日(金)

キャンパス
三鷹
セミナー名
国立天文台談話会
定例・臨時の別
定例
日時
10月20日(金) 16:00-17:00
場所
大セミナー室
講演者
Eduard Vorobyov
所属機関:Technical University of Vienna
タイトル
Variable protostellar accretion with episodic bursts
Abstract
It has recently become evident from both numerical studies and observational studies that accretion onto both low-mass and high-mass protostars may have a highly variable character with episodic bursts revealing themselves as FU-Orionis-type and EX- Lupi-like eruptions. This newly emerging paradigm begins to supersede the classical Shu-Larson-Penston steady accretion model, which may have important consequences for the evolution of stars and planets. I will review the current status of the variable accretion paradigm, focusing on the disk gravitational instability and fragmentation model, in which accretion bursts are triggered by fragments migrating onto the star. Various implications of variable accretion on both young stars and their protostellar disks will be discussed.

連絡先
-名前:滝脇 知也

Home > Solar and Space Plasma (SSP) Seminar | 太陽系小天体セミナー | 理論コロキウム | 総研大コロキウム | 赤外ゼミ > 2017.10.16-10.22

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