Home > Solar and Space Plasma (SSP) Seminar | 国立天文台談話会 | 太陽系小天体セミナー | 科学研究部コロキウム | 総研大コロキウム > 2019.04.22-04.28

2019.04.22-04.28

    

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

Home > Solar and Space Plasma (SSP) Seminar | 国立天文台談話会 | 太陽系小天体セミナー | 科学研究部コロキウム | 総研大コロキウム > 2019.04.22-04.28

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