Constructing the model for a stability and evolution of the subsurface ocean in icy bodies
| Project/Area Number |
17K05635
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Solid earth and planetary physics
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
Kimura Jun 大阪大学, 理学研究科, 助教 (00536138)
|
|---|
| Project Period (FY) |
2017-04-01 – 2020-03-31
|
| Project Status |
Completed (Fiscal Year 2019)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
|
|---|
| Keywords | 氷天体 / 内部構造 / 進化 / 生命 / アストロバイオロジー / 衛星 / 熱史 / 氷 / 惑星起源・進化 / 惑星探査 / 宇宙科学 / 地球・惑星内部構造 |
|---|
| Outline of Final Research Achievements |
A numerical model is constructed to explain the long-term evolution of the subsurface ocean in icy bodies. The model is applicable to various internal structures of icy objects, including high-pressure ice, by providing the internal layer structure and initial temperature distribution (solid-liquid state of H2O shell) and the enrichment of long-lived radioisotopes in the rock core. The calculations for Pluto show that the melting viscosity of ice must be greater than 1E15 Pas for the present-day Pluto to have a subsurface ocean, and the initial presence of 1 mass% ammonia extends the subsurface ocean's duration by more than 1 billion years.
|
| Academic Significance and Societal Importance of the Research Achievements |
海という大規模な液体水圏の有無とその進化の描像に迫ることは，「生命の起源」という究極の問題への直接的なアプローチのひとつである。特に氷天体という，地球外天体での生命発生環境の候補地としての科学的重要性は，日本惑星科学会が「太陽系における前生命環境の進化―生命圏の誕生・持続に至る条件の解明」として将来目標に掲げているなど，国内外で共通した認識にある。本課題は，太陽系の生命存在可能領域が地球近傍だけではないことを，理論的解析と実証的調査への示唆によって提示する。これは太陽系内天体における宇宙生命論のみならず，系外惑星観測も含めた宇宙の普遍的な生命居住可能性の理解に繋がり，波及効果は大きい。
|
Report
(4 results)
Research Products
(54 results)
-
-
-
-
-
-
-
-
[Journal Article] The Ganymede laser altimeter (GALA): key objectives, instrument design, and performance2019
Author(s)
H. Hussmann, K. Lingenauber, R. Kallenbach, K. Enya, N. Thomas, L. M. Lara, C. Althaus, H. Araki, T. Behnke, J. M. Castro-Marin, H. Eisenmenger, T. Gerber, M. H. de la Revilla, C. Huttig, K. Ishibashi, J. Jimenez-Ortega, J. Kimura et al.
-
Journal Title
CEAS Space Journal
Volume: -
Issue: 4
Pages: 381-390
DOI
Related Report
Peer Reviewed / Int'l Joint Research
-
-
-
-
[Journal Article] The geomorphology, color, and thermal properties of Ryugu: Implications for parent-body processes2019
Author(s)
Seiji Sugita, R. Honda, T. Morota, S. Kameda, H. Sawada, E. Tatsumi, M. Yamada, C. Honda, Y. Yokota, T. Kouyama, N. Sakatani, K. Ogawa, H. Suzuki, T. Okada, N. Namiki, S. Tanaka, Y. Iijima, K. Yoshioka, M. Hayakawa, Y. Cho, M. Matsuoka, N. Hirata, N. Hirata, H. Miyamoto, Jun Kimura
-
Journal Title
Science
Volume: 17
Issue: 6437
Pages: 252-252
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
[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
-
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
-
[Journal Article] Feasibility of the exploration of the subsurface structures of Jupiter's icy moons by interference of Jovian hectometric and decametric radiation2018
Author(s)
Atsushi Kumamoto, Y. Kasaba, F. Tsuchiya, H. Misawa, H. Kita, W. Puccioy, J.-E. Wahlundy, J. Bergmany, B. Cecconi, Y. Gotox, Jun Kimura
-
Journal Title
Planetary Radio Emissions VIII
Volume: -
Pages: 127-136
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
[Journal Article] Global classification of lunar reflectance spectra obtained by Kaguya (SELENE): Implication for hidden basaltic materials2018
Author(s)
Hareyama, M., Y. Ishihara, H. Demura, N. Hirata, C. Honda, S. Kamata, Y. Karouji, J. Kimura, T. Morota, H. Nagaoka, R. Nakamura, S. Yamamoto, Y. Yokota, M. Ohtake
-
Journal Title
Icarus
Volume: 321
Pages: 407-425
DOI
Related Report
Peer Reviewed
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
[Presentation] The Ganymede Laser Altimeter (GALA) for ESA’s Jupiter Icy Moons Explorer (JUICE) Mission2018
Author(s)
Hauke Hussmann, Kay Lingenauber, Reinald Kallenbach, Jurgen Oberst, Keigo Enya, Masanori Kobayashi, Noriyuki Namiki, Jun Kimura, N. Thomas, L. Lara, Gregor Steinbrugge, Alexander Stark, Fabian Luedicke, Thomas Behnke, Christian Althaus, Simone Del Togno, Belinda Borgs, Harald Michaelis, Judit Janchen
Organizer
EPSC 2018
Related Report
Int'l Joint Research
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
