4月23日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
Apr 23 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
4月24日（水）10:30 -12:00 総研大コロキウム 講義室
Apr 24 Wed SOKENDAI colloquium Lecture Room
4月24日（水）13：30～15：00 科学研究部コロキウム 開発棟３号館３階会議室
Apr 24 Wed Colloquium of Division of Science Conference room, Instrument Development Bldg. 3 3F
4月26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
Apr 26 Fri Solar and Space Plasma Seminar Student Seminar Room, Subaru Bldg.
4月26日（金）16：00～17：00 国立天文台談話会 大セミナー室
Apr 26 Fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
4月23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
- 4月23日（火曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 講演者
- 佐藤幹哉
- 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
4月24日（水）
- Campus
- Mitaka
- Seminar
- SOKENDAI colloquium
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- April 24, 2019, 10:30 -12:00
- Place
- Lecture Room
- Speaker
- Satoshi Tanioka
- Affiliation
- SOKENDAI 4th year (D2)(Supervisor: Yoichi Aso, Ryutaro Takahashi, Tomotada Akutsu)
- Title
- Report on my visit to MIT
- Abstract
- On April 1st, 2019, LIGO and VIRGO began the 3rd observing run to search gravitational waves. Coating thermal noise is one of the most important noise sources in these gravitational wave detectors. In order to reduce coating thermal noise, direct measurement of it is ongoing at MIT LIGO Lab. I will report the activity at MIT and future prospects of coating.
- Facilitator
- -Name： Kei Ito
- Comment
4月24日（水）
- Campus
- Mitaka
- Seminar
- Colloquium of Division of Science
- Regularly Scheduled/Sporadic
- Regularly Scheduled
- Date and time
- April 24th 13:30-15:00
- Place
- Conference room, Instrument Development Bldg. 3, 3F
- Speaker
- Hideko Nomura
- Affiliation
- Division of Science, NAOJ
- Title
- Chemistry and Organic Molecules in Protoplanetary Disks
- Abstract
- Protoplanetary disks are the natal place of planets and understanding
chemical compositions of gas, dust and ice in the disks will help us to
understand the origins of materials in our Solar system. Now, ALMA
(Atacama Large Millimeter/submillimeter Array) enables us to detect
complex organic molecules (COMs) in the disks, CH3CN and CH3OH, which
would lead to more complex organic compounds, such as those found in the
comet 67P/Churyumov-Gerasimenko by the Rosetta mission. Protoplanetary
disks are known as the object of chemical diversity because the physical
structure dramatically changes depending on the distance from the
central star which is the main source of heating and UV radiation. We
investigate the synthesis of COMs in the disks using a large gas-grain
chemical network together with a 2D steady-state physical model of a
disk irradiated by UV and X-rays from the central star. Radical-radical
reactions on warm grain surface as well as hydrogenation reactions on
cold grain surface are considered in the reaction network. In addition,
we are extending our work, taking into account possible carbon grain
destruction and including grain mantle reactions which could proceed in
the region where water ice is crystallized in the disks. I will also
talk about some related astrochemical phenomena in the disks. - Facilitator
- -Name：Misako Tatsuuma
- Comment
4月26日（金）
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- 26 April (Fri), 13:30-15:00
- Place
- Student Seminar Room, Subaru Bldg.
- Speaker
- Ramses Ramirez
- Affiliation
- Tokyo Institute of Technology, Earth-Life Science Institute
- Title
- The effects of tidal forces and flares on habitable zone planets orbiting M-dwarfs
- Abstract
- M-dwarfs are the most common stars in the galaxy and will remain a focus for current and upcoming space- and ground-based observations. However, the close-in orbits of M-dwarfs, coupled with their relatively high stellar activity, suggest that both synchronous rotation and stellar flares may be challenges for the habitability of planets located in the habitable zone (HZ). Here, I will review how both synchronous rotation and stellar flares impact the habitability of M-dwarf HZ planets and discuss whether these effects are truly detrimental to habitability or not. Both atmospheric and surface effects will be discussed, including their impact on life.
- Facilitator
- -Name：Masahito Kubo
- Comment
4月26日（金）
- Campus
- Mitaka
- Seminar
- NAOJ seminar
- Regularly Scheduled/Sporadic
- Scheduled
- Date and time
- Fri 26 Apr 16:00～17:00
- Place
- Large Seminar Room
- Speaker
- Ramses Ramirez
- Affiliation
- Earth-Life Science Institute
- Title
- “The habitability of planets orbiting M-dwarf systems and the implications for life”
- Abstract
- Although M-stars are the most popular targets (>50% of the stars in our galaxy) for current and next-generation space mission architectures to observe, planets located in their habitable zones face several significant challenges to their habitability. These include intense stellar radiation environments, a high pre-main-sequence stellar luminosity that can desiccate planetary surfaces, high impact velocities, tidal-locking among other issues. I also introduce the new concern that CH4, a greenhouse gas associated with life on Earth, /cools/ planetary surfaces around M-dwarfs. I discuss these and other known challenges to M-dwarf habitability. I also propose potential solutions to such problems. Recent studies have also argued that ocean worlds, planets that lack land and have no active plate tectonics, may be particularly common around M-stars. I explain how such planets may be habitable in spite of lacking key traits and mechanisms that are important to the habitability of the Earth. I assess the habitability of the TRAPPIST-1 planets. I also discuss the observations that can be made with next-generation missions, including JWST and TMT. Finally, I speculate on what our work may mean regarding the abundance of life in the universe.
- Facilitator
- -Name：Narukage, Noriyuki