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#author("2020-10-09T04:26:17+00:00","default:wwwadm","wwwadm")
#author("2020-10-15T14:27:16+00:00","default:wwwadm","wwwadm")
*IoA Seminar 2020 / 令和2年度/2020年度・東京大学・天文学教育研究センター・談話会 [#t8e79eca]
#contents
* Upcoming Seminars [#ebd6a62d]
** No. 360: 15 October 2020 (Thu) 15:30 - 16:30 [#zb727807]
*** Speaker: NAMEKATA, Kosuke 行方 宏介 (Kyoto University 京都大学) [#n8039b62]
*** Title: Stellar superflares on late-type stars - recent results by 3.8-m Seimei telescope - (京大3.8mせいめい望遠鏡で迫る恒星スーパーフレア) [#zd1c2e20]
Abstract:
Solar flares are explosive phenomena on the solar surface. They often produce high XUV radiations, high energy particles, and mass ejections which have potential risks to damage human technologies. On other stars, such as M dwarfs and young stars, larger ‘superflares’ (more than ten times larger than the most energetic solar flares) are known to frequently occur, severely affecting the exoplanet habitability. Recently, there is an increasing interest in the question “How do the stellar magnetic activities on central stars affect the planetary environment?”, and therefore the properties of stellar superflares become more and more important. Optical spectroscopic observations have a potential to reveal the properties of superflares, but the detections of ssuperflares have been very rare due to its low occurrence frequency. We have conducted optical spectroscopic observations of stellar superflares on M-/G-dwarfs with the 3.8-m Seimei telescope since 2019. We have succeeded in detecting optical spectra of the rare stellar superflares with very high time-cadence and high quality. We found a very dynamic change in optical spectra during a superflare as evidence of strong injections of high-energy particles to the stellar atmosphere (Namekata et al. 2020b). Moreover, we detected the first, conclusive evidence of stellar mass ejection, which revealed the mechanism of mass ejections and would enable us to estimate its direct impact on exoplanets (Namekata et al. submitted). In this talk, I will talk about the recent results by the Seimei telescope.
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* 本談話会について [#c1b638ff]
** 趣旨 [#d48cd456]
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:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]に引き続き, 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.
**日時 [#ve668db6]
-木曜日
-15:30-16:30
**場所 [#j9cedf34]
-天文センター講義室
**標準タイムテーブル [#b66015f3]
|13:30-14:30|[[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]|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 [#q8bd3108]
ML: semiadm _at_ ioa.s.u-tokyo.ac.jp
please replace _at_ with @
- TANAKA, Masuo 田中培生 mtanaka _at_ ioa.s.u-tokyo.ac.jp
- MOROKUMA, Tomoki 諸隈智貴 tmorokuma _at_ ioa.s.u-tokyo.ac.jp
- TAKEKOSHI, Tatsuya 竹腰達哉 tatsuya.takekoshi _at_ ioa.s.u-tokyo.ac.jp
- SAMESHIMA, Hiroaki 鮫島寛明 hsameshima _at_ ioa.s.u-tokyo.ac.jp
** Schedule [#ac94b97b]
|BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):Chair|
|360|2020/10/15(Thu) 15:30 - 16:30 | 行方宏介 Namekata, Kosuke (京都大学) | Stellar superflares on late-type stars - recent results by 3.8-m Seimei telescope | TM |
**終了した談話会(2020年度) [#h9b1f387]
詳細はこちら: [[令和2(2020)年度談話会]]
|BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):Chair|
|359|2020/10/08(Thu) 15:30 - 16:30 | 吳柏鋒 Wu, Po-Feng (EACOA Fellow/NAOJ) | The blind men and the elephant: Multiple evolutionary paths from star-forming galaxies to quiescence | TT |
|360|2020/10/15(Thu) 15:30 - 16:30 | 行方宏介 Namekata, Kosuke (京都大学) | Stellar superflares on late-type stars - recent results by 3.8-m Seimei telescope | TM |
**これまでの談話会 [#e657f394]
-[[令和2(2020)年度談話会]]
-[[平成31(2019)年度談話会]]
-[[平成30 (2018) 年度談話会]]
-[[平成29 (2017) 年度談話会]]
-[[平成28 (2016) 年度談話会]]
-[[平成27 (2015) 年度談話会]]
-[[平成26 (2014) 年度談話会]]
-[[平成25 (2013) 年度談話会]]
-[[平成24 (2012) 年度談話会]]
-[[平成23 (2011) 年度談話会]]
-[[平成22 (2010) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H22.html]]
-[[平成21 (2009) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H21.html]]
-[[平成20 (2008) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H20.html]]
-[[平成19 (2007) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H19.html]]
-[[平成18 (2006) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H18.html]]
-[[平成17 (2005) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H17.html]]
-[[平成16 (2004) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H16.html]]
-[[平成15 (2003) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H15.html]]
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