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2016.12.5-12.11

12月5日(月)13:30~15:00  太陽系小天体セミナー   南棟2階会議室
Dec 5 mon    Solar System Minor Body Seminar  Conference Room, South Bldg.2F

12月7日(水)10:30~12:00   総研大コロキウム     中央棟(北)1F講義室
Dec 7 wed           SOKENDAI Colloquium   Lecture room

12月8日(木)15:00~16:00  VLBIコロキウム     中央棟(南)2階VLBIセミナー室
Dec 8 thu        VLBI Colloquium  VLBI Seminar Room, Main Bldg. (South) 2F

12月9日(金)13:30~14:30  理論コロキウム     コスモス会館会議室                        
Dec 9 fri           DTA colloquium   Conference Room, Cosmos Lodge                       

12月9日(金)16:00~17:00  国立天文台談話会     大セミナー室
Dec 9 fri            NAOJ Seminar      Large Seminar Room

詳細は以下をご覧下さい。

12月5日(月)

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
12月5日(月曜日)13時30分~15時
場所
南棟2階会議室
講演者
新中善晴

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

12月7日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Regular
Date and time
10:30-12:00, December 7, 2016
Place
Lecture room
Speaker
Speaker1 Yi Yang
Affiliation
SOKENDAI (D3) (Supervisor; Saeko Hayashi)
Title
A polarimetry look of T Tau Circumstellar Environment
Speaker
Speaker2 Moegi Yamamoto
Affiliation
SOKENDAI
Title
TBD

Facilitator
-Name:Kotomi Taniguchi

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

12月8日(木)

キャンパス
三鷹
セミナー名
VLBIコロキウム
定例・臨時の別
定例
日時
12月8日(木曜日)15時~16時
場所
中央棟(南)2階VLBIセミナー室
講演者
Fumie Tazaki
所属
Mizusawa VLBI Observatory
タイトル
Highly resolved images at 43/86 GHz of the M87 jet base reconstructed with sparse modeling
Abstract
Sparse modeling is a new imaging technique with radio interferometry, which solves underdetermined
problem directly by assuming “sparsity” of the images. Using this new technique, we successfully
reconstructed M87 jet base observed with VLBA and VLBA+GBT at 43 and 86 GHz, respectively. The
43/86 GHz images represent the ridge structures of jets that start at 0.1/0.09 mas from the core,
which are closer to the core than those detected with CLEAN technique (0.6/0.13 mas from the core).
Measuring the core size, we found that the size is consistent with that of the CLEAN images. This
result shows that the core has been already resolved with CLEAN technique.
In the seminar, I will introduce the technique of sparse modeling briefly, and report the results
of M87 jet base imaging.

連絡先
-名前:倉持一輝

備考
英語、テレビ参加可

12月9日(金)

Campus
Mitaka
Seminar
DTA colloquium
Regularly Scheduled/Sporadic
Regularly Scheduled Date and time:09 December 2016, 13:30-14:30
Place
Conference Room, Cosmos Lodge
Speaker
Manos Chatzopoulos
Affiliation
Louisiana State University
Title
Pre-supernova Convection in Massive Stars
Abstract
The interior of a massive star in the final years prior to core-collapse supernova is in a state of violent unrest. Vigorous convective shell burning of silicon, oxygen and carbon drives large scale plume motions that can interact with each other and significantly alter the structure of the progenitor star. Under such conditions the star departs from perfect hydrostatic equilibrium and spherical symmetry and may experience dynamical pulses that, in some cases, can lead to episodic mass-loss. I will present preliminary results from multidimensional simulations of convection in massive stars in the few seconds to hours preceding the supernova explosion. The proper, dynamical multidimensional treatment of convection will be bench-marked against parametrized one-dimensional mixing length theory predictions and the implications for realistic core-collapse supernova progenitor models will be discussed. I will also present a new method to characterize pre-supernova convection, the method of Vector Spherical Harmonics decomposition, and discuss how it can be used to make realizations of core-collapse models in future simulations.

Facilitator
-Name:Tomoya Takiwaki

Comment
in English

12月9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
12月9日(金) 16:00-17:00
場所
大セミナー室
講演者
Timo Prusti
所属
ESA Scientific Support Office, ESTEC
タイトル
Gaia between the first and second data releases
Abstract
Gaia mission is underway conducting its nominal 5-year survey of the sky. The first Gaia data release (Gaia DR1) took place 14 September 2016. Exploitation is at full speed with preprints appearing on a regular basis. At the moment two and half years of routine phase has been completed and preparations for the second data release (Gaia DR2) are in full swing. In the presentation the status of the mission is outlined with a short explanation of some operational aspects and their impact on the mission. A selection of early results from Gaia DR1 is presented. With a few examples extracted from the early mission data the further potential of Gaia is demonstrated. An outline of the contents for Gaia DR2 is provided.

連絡先
-名前:松田 有一

以上

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