2016 Fiscal Year Final Research Report
Modelling and theoretical study for exoplanet atmospheres
| Project Area | New Frontiers of Extrasolar Planets: Exploring Terrestrial Planets |
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| Project/Area Number |
23103003
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
林 祥介 神戸大学, 理学(系)研究科(研究院), 教授 (20180979)
阿部 豊 東京大学, 理学(系)研究科(研究院), 准教授 (90192468)
はしもと じょーじ 岡山大学, 自然科学研究科, 准教授 (10372658)
関根 康人 東京大学, 理学(系)研究科(研究院), 准教授 (60431897)
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| Co-Investigator(Renkei-kenkyūsha) |
ISHIWATARI Masaki 北海道大学, 大学院理学研究院, 准教授 (90271692)
SUGIYAMA Koichiro 松江工業高等専門学校, 情報工学科, 准教授 (90271692)
GENDA Hidenori 東京工業大学, 地球生命研究所, 准教授 (90456260)
TAKEHIRO Shinichi 京都大学, 数理解析研究所, 准教授 (30274426)
SASAKI Yohei 京都大学, 大学院理学研究科, 研究員 (70583459)
NAKAJIMA Kensuke 九州大学, 大学院理学研究院, 助教 (10192668)
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| Research Collaborator |
HAMANO Keiko 東京大学, 理学系研究科, 研究員 (40646171)
ONISHI Masanori 神戸大学, 理学研究科, 研究員 (50644887)
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| Project Period (FY) |
2011-04-01 – 2016-03-31
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| Keywords | 系外惑星 / 大気循環シミュレーション / 同期回転惑星 / 大気放射スペクトル / 大気散逸 / ハビタブルゾーン / 大気進化 |
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| Outline of Final Research Achievements |
Evolution of steam atmospheres on earth-like planets after each final giant impact event is theoretically solved with an analysis of its observability. Two types of evolutionary tracks are found: one is the rapid formation of a water ocean and another is the long-term persistence of the magma ocean state. The secular loss of surface water due to atmospheric escape driven by stellar UV irradiation may rather stabilize surface liquid water than merely produce an arid surface environment. General circulation experiments provided with various boundary conditions reveal that a synchronously rotating planet and a land planet may have wider habitable zones than previously thought. Numerical models to solve cloud convection and radiative transfer in gas giant planets are also developed, revealing the mechanisms for the intermittencies observed for cloud convection in the solar system gas planets as well as roles of cloud layers on controlling the thermal emission from gas giant atmospheres.
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| Free Research Field |
惑星科学
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