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東京大学・天文学教育研究センターでは2003年4月から談話会を開いています。
第一線で活躍されている研究者の方々を講師にお招きし、最先端の研究成果をお話しいただきます。
講師の方には、大学院生の参加者のことも考慮し、レビュー的な側面も含めた上で、ご自身の研究紹介をお願いしています。
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専門的な研究と教育を目的として開催されています。
一般の方は公開講座・講演会などにご参加いただければ幸いです。
ML: semiadm _at_ ioa.s.u-tokyo.ac.jp
please replace _at_ with @
Language: English
Abstract: The James Clerk Maxwell Telescope (JCMT) has been monitoring eight nearby low-mass star-forming regions in the Gould Belt at submillimetre wavelengths for over six years to search for and quantify the time dependent brightness variability of the resident deeply embedded protostars. Secular variability is common among these protostars; greater than 25% of the sample show measurable long-term brightness changes and 10% show burst behaviour lasting months to years. We interpret this secular variability as reflecting changes in the mass accretion rate from the disk to the protostar, as predicted by theoretical models of (proto)stellar assembly. For a subset of our sample we have contemporaneous mid-IR light-curves which allow additional constraints on the conditions responsible for the brightness variations, confirming that the submillimetre variability is driven by changes in the dust temperature profile of the envelope. Furthermore, we have combined, for one source, single dish and interferometric sub-mm monitoring, which has allowed us to unambiguously recover a time lag in the variability at larger angular scales and use the results to confirm the envelope structure surrounding the embedded protostar. More recently, we have added somewhat more distant intermediate mass regions to our JCMT monitoring and collaborated with the Maser Monitoring Organization (M2O) in follow-up of more massive protostar candidate variables.
| # | Date | Speaker | Title | Chair |
| 401 | 2023年4月20日(木) | Yao-Lun Yang (RIKEN) | Complex chemistry in the era of JWST and ALMA | 天文センター |
| 402 | 2023年5月26日(木) | 藤田真司 (IoA/UT) | TBA | 天文センター |
詳細はこちら: 令和5(2023)年度談話会
| # | Date | Speaker | Title | Chair |
