| Project/Area Number |
16K17787
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 氷天体 / 長期進化 / 内部海 / 熱進化 / 粘性緩和 / 冥王星 / 氷地殻 / 粘弾性変形 / 氷衛星 / 潮汐変形 / 潮汐加熱 / エンセラダス |
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| Outline of Final Research Achievements |
In this study, I investigated the long-term evolution of icy planetary bodies such as icy satellites and icy dwarf planets in terms of large-scale deformation. For the Saturnian icy satellite Enceladus, I investigated long-term viscoelastic deformation of the ice shell and constrained the energy budget of the satellite. For the Jovian icy satellite Ganymede, I quantified the effect of the interior structure on tidal deformation (short-term large-scale deformation) to assess the possibility of interior structure exploration through geodetic observations. For the icy dwarf planet Pluto, I investigated long-term viscoelastic deformation of the ice shell and constrained the thermal and structural evolution of the dwarf planet.
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| Academic Significance and Societal Importance of the Research Achievements |
時代を超えて人類が挑んできた難問の一つに「地球以外に生命を宿す天体はあるのかないのか」がある。外側太陽系の氷天体の内部には、生命の誕生と生存に深く関わる液体の水でできた「海」の存在が明らかになってきている。しかし、これらの「内部海」がどの深さにあるのかや、なぜ凍結せずに維持されているのか不明である。本研究は、理論と探査データ解析の融合させてこれらの疑問を解き、氷天体における生命生存可能性に関する議論の土台を提供する。
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