Evolution of icy planetary bodies inferred from large-scale deformation
| 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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Report
(5 results)
Research Products
(35 results)
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[Journal Article] Science Objectives of the Ganymede Laser Altimeter (GALA) for the JUICE mission2018
Author(s)
Jun Kimura, H. Hussmann, S. Kamata, K. Matsumoto, J. Oberst, G. Steinbrugge, A. Stark, K. Gwinner, S. Oshigami, N. Namiki, K. Lingenauber, K. Enya, K. Kuramoto, and S. Sasaki
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Journal Title
Transactions of the Japan Society for Aeronautical and Space Sciences
Volume: 17
Issue: 2
Pages: 234-243
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Geophysical investigations of habitability in ice-covered ocean worlds2018
Author(s)
Vance, S. D., M. P. Panning, S. Stahler, F. Cammarano, B. G. Bills, G. Tobie, S. Kamata, S. Kedar, C. Sotin, W. T. Pike, R. Lorenz, H.-H. Huang, J. M. Jackson, and B. Banerdt
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Journal Title
J. Geophys. Res. Planets
Volume: 123
Issue: 1
Pages: 180-205
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] JUICE 搭載ガニメデレーザ高度計 (GALA) - 概要および日本チーム開発状況2018
Author(s)
塩谷圭吾, 並木則行, 小林正規, 木村淳, 荒木博志, 野田寛大, 田澤誠一, 押上祥子, 鹿島伸悟, 宇都宮真, 石橋高, 小林進悟, 山脇敏彦, 東原和行, 尾崎正伸, 水野貴秀, 斎藤義文, 鎌田俊一, 他
Organizer
日本惑星科学会2018年秋季講演会
Related Report
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