2011年度・東京大学・天文学教育研究センター・談話会†
次回以降の談話会†
第183回: 2011/10/06(木) 15:30-16:30†
眞山 聡 氏 (総研大)
「すばる+ALMA及びコンピュータシミュレーションで探る連星系原始惑星系円盤」
"Subaru + ALMA Observations and numerical simulations of Protoplanetary Disks in a Young Multiple star"
Protoplanetary disks afford a key to an understanding of the formation of our Solar System
and other planetary systems. They are the ingredients of planets and play important roles
in early stellar evolution. If a forming star with a protoplanetary disk has close companions,
the disk may be seriously influenced. This effect should not be ovelooked
because most stars form as multiples. Studies of protoplanetary disks in multiple systems are
thus important to unravel the general process of star and planet formation.
From this point of view, we conducted Subaru direct observations of protoplanetary disks
in multiple systems. High angular resolution near-infrared adaptive optics images of
young binaries were obtained with the infrared camera Coronagraphic Imager
with Adaptive Optics mounted on the 8.2m Subaru Telescope. Our 0."1 resolution images
resolve complex circumstellar structures around binary systems. We present our observational
result as well as 2D and 3D numerical simulations which reproduce accretion onto the binary system.
Additionally, our observational future plans of multiple protoplanetary disks using ALMA will be introduced.
第184回: 2011/10/13(木) 15:30-16:30†
Gaston Folatelli 氏 (東京大学・IPMU)
"What spectra reveal of Type Ia Supernovae"
I will address the importance of Type Ia supernovae (SNe Ia) as astrophysical objects,
and also as distance indicators for cosmology. Based on data from the Carnegie Supernova
Project (CSP), I will describe how precision distances are obtained, with a detailed characterization
of reddening. The role of optical spectroscopy in improving our understanding of the physical
nature of these events will be addressed. In particular, I will show a recent finding of unburned
material in a significant fraction of SNe Ia, and its implications on explosion physics.
第185回: 2011/10/17(月) 15:30-16:30†
Wolfgang Gieren 氏 (Universidad de Concepcion)
"Improving the extragalactic distance scale with stellar distance indicators: The Araucaria Project"
I will review recent progress made in our project towards calibrating the classical Cepheid
period-luminosity (PL) relation, both from observing Cepheid samples in nearby galaxies
in optical and near-infrared bands, and by applying the Infrared Surface Brightness Technique
to Cepheids in the Milky Way and the Magellanic Clouds.
Evidence is presented that the K-band PL relation is universal (e.g. independent of the metallicity
of the calibrating or target Cepheid samples), and a best absolute PL relation is presented
which can be readily used to measure a precision distance to any galaxy containg classical Cepheids.
I will also review recent progress in using late-type eclipsing binary systems in the Magellanic Clouds
for deriving distances of exquisite (3%) accuracy to the Clouds, setting a very accurate zero point
for the distance scale. I will further present our recent determination of the first accurate dynamical
masses of two classical Cepheids in the LMC which settle the Cepheid mass discrepancy problem
and improve the physical knowledge of Cepheid stars as primary distance indicators.
Finally, I will highlight a new spectroscopic method to measure accurate distances
to spiral galaxies from their blue supergiant population, and demonstrate that this new
technique yields distance results in very good agreement with Cepheids.
Quantitative spectroscopy of blue supergiants is also an excellent means to establish correct,
unbiased metallicity gradients in the disks of spiral galaxies
which are an essential input for galaxy formation and evolution scenarios.
東京大学・天文学教育研究センターでは2003年4月から, 院生コロキウムに引き続き, 談話会を開いています.
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タイムテーブル†
| 13:30-14:30 | 院生コロキウム | 講義室 |
| 15:30-16:30 | 談話会 | 講義室 |
| 16:30- | お茶の時間 | 講義室横のお茶部屋~講師の方を交えて~ |
世話人†
- 田中 培生
- 諸隈 智貴: tmorokuma_at_ioa.s.u-tokyo.ac.jp (_at_を@に置き換えてください)
| # | 日付 | 講演者 (所属) | タイトル |
| 183 | 2011/10/06(木) | 眞山 聡 氏 (総研大) | 「すばる+ALMA及びコンピュータシミュレーションで探る連星系原始惑星系円盤」"Subaru + ALMA Observations and numerical simulations of Protoplanetary Disks in a Young Multiple star" |
| 184 | 2011/10/13(木) | Gaston Folatelli 氏 (東京大学・IPMU) | "What spectra reveal of Type Ia Supernovae" |
| 185 | 2011/10/17(月) | Wolfgang Gieren 氏 (Universidad de Concepcion) | "Improving the extragalactic distance scale with stellar distance indicators: The Araucaria Project" |
| - | 2011/11/24(木) | 高橋 英則 氏 (東京大学・天文センター) | 未定 |
| - | 2011/12/01(木) | 松永 典之 氏 (東京大学・天文センター・木曽観測所) | 未定 |
| - | 2011/xx/xx(x) | 西澤 淳 氏 (東京大学・IPMU) | 未定 |
終了した談話会†
詳細はこちら: 平成23 (2011) 年度談話会
| # | 日付 | 講演者 (所属) | タイトル |
| 177 | 2011/05/19(木) | 田村 陽一 氏 (東京大学・天文センター) | 「ASTE搭載用超伝導転移端センサ型ボロメータカメラとALMA初期科学運用」 |
| 178 | 2011/06/16(木) | Michael Richmond 氏 (Rochester Institute of Technology) | "Looking for eclipsing RR Lyr stars in the MACHO database" |
| 179 | 2011/06/30(木) | 田中 賢幸 氏 (東京大学・IPMU) | "A new method to identify AGNs and the nature of low-luminosity AGNs" |
| 180 | 2011/07/07(木) | 橋本 哲也 氏 (国立天文台) | "A hint of AGN feedback: Shock heating of ISM induced by a jet in NGC 1068" |
| 181 | 2011/07/21(木) | 柏川 伸成 氏 (国立天文台) | 「AKB48 vs. NMB48 vs. SKE48, そして LAE45vs.LAE54」」, "Completing the Census of Lyα Emitters at the Reionization Epoch" |
| 182 | 2011/07/28(木) | 上塚 貴史 氏 (東京大学・天文センター) | Mid-infrared spectral monitoring toward AGB stars - Probing the formation of circumstellar dust - |
過去の談話会†
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