| Project/Area Number |
22KJ1286
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| Project/Area Number (Other) |
21J22854 (2021-2022)
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2021-2022) |
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| Section | 国内 |
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| Review Section |
Basic Section 17010:Space and planetary sciences-related
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
WONG WAI EMILY 東京工業大学, 理学院, 特別研究員(DC1)
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2023: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2022: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | 固体地球惑星物理学 / 固体惑星・衛星・小惑星 / 惑星形成・進化 / 太陽系外側領域 / クレーター / 氷の衛星 / 巨大惑星の衛星 / エンセラドゥス / Outer solar system / Icy satellites / Crater chronology / Giant planet migration / Cratering chronology / Planet migration / Impact flux / Impact probability |
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| Outline of Research at the Start |
We used crater densities from the literature and our updated impact chronology onto Saturn to construct model impact-crater isochrons (the scaling of the satellite crater production function with time). The surface ages derived ranges from 4.1 to 4.4 Ga, the satellites are ancient.
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| Outline of Annual Research Achievements |
Conflicting ideas about Enceladus’ interior come from predictions of its tidal history, an uncertain bombardment history, and a limited understanding of the crater. So, we combine the latest computer models of outer Solar System and a new massive database of Enceladus’ craters to study the geological history of its icy surface. We calculated that Enceladus' oldest parts, around the North Pole, have been frozen for over 4.1 billion years. Its trailing and leading hemispheres have resurfaced at least three times in the past 3 billion years; those regions look fresher and smoother. The most recent resurfacing event was about 10 million years ago. This timing lines up with when Enceladus might have heated up from the tides and helps us constrain the tidal history of the Saturnian moon system.
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