| 研究課題/領域番号 |
19J13927
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 国内 |
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| 審査区分 |
小区分17010:宇宙惑星科学関連
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| 研究機関 | 東京工業大学 |
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研究代表者 |
WOO Man Yin 東京工業大学, 理学院, 特別研究員(DC2)
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| 研究期間 (年度) |
2019-04-25 – 2020-03-31
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| 研究課題ステータス |
中途終了 (2019年度)
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| 配分額 *注記 |
2,300千円 (直接経費: 2,300千円)
2019年度: 1,200千円 (直接経費: 1,200千円)
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| キーワード | Mars / isotope / giant impact / planet formation / SPH / N-body |
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| 研究開始時の研究の概要 |
The early history of the terrestrial planets is still a mystery. In our study, we will combine numerical simulations with cosmochemical data obtained from meteorites to constraint the formation and the early evolution of Mars, which is crucial to answer whether life could have existed on Mars.
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| 研究実績の概要 |
I published two papers during my PhD study. The first paper is about combining isotopic data from meteoritic study and N-body simulation results to further constrain planet formation models. Our team found that in order to reproduce the isotopic differences between Earth and Mars, a compositional change of the initial solid disk from enstatite chondrite to ordinary chondrite have to occur at around 1.3 AU from the Sun, regardless of the dynamical models we adopted for the N-body simulations. This study opens the door of combining meteoritic studies with computational simulation data to study planet formation.
My second paper focuses on dictating the early surface environment on Mars after a single giant impact. Our team combined Smooth particle hydrodynamic (SPH) simulations with analytical theory to calculate whether a giant impact between a Ceres-sized impact and the early Mars is sufficient in changing the early surface environment on Mars. Such giant impact is likely to have occurred no later than 4480 Ma. We found that after the giant impact, about 3 bars of hydrogen (H2) gas is formed. A thick H2 atmosphere could be an important source for triggering life on a planet since it maintains a reducing environment which favorite pre-biotic chemistry. However, such thick H2 atmosphere is unlikely to survive more than 20 Myr, due to the active young Sun. Hence we concluded that it is difficult for life to emerge on Mars after this late giant impact. This is an indicative research on the possibility of searching for extraterrestrial life on Mars.
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| 現在までの達成度 (段落) |
令和元年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
令和元年度が最終年度であるため、記入しない。
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