2010 Fiscal Year Final Research Report
Origin of the variety of asteroids and icy satellites driven by the impact disruption of planetesimals in thermal evolution
| Project/Area Number |
20340118
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Nagoya University |
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Principal Investigator |
ARAKAWA Masahiko Nagoya University, 大学院・理学研究科, 教授 (10222738)
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| Co-Investigator(Kenkyū-buntansha) |
KOUCHI Akira 北海道大学, 低温科学研究所, 教授 (60161866)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 小惑星 / 衝突破壊 / 氷微惑星 / 焼結 / 層構造 / 熱進化 / 多様性 / 圧密 |
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| Research Abstract |
Impact disruption of planetesimals with layered structure in their interiors could be one of the origins of the density and composition variation observed in asteroids and satellites. Thus, we studied the compaction and the sintering processes of icy planetesimals and also studied the impact process of small icy bodies with various porosities originated from the impact disruption of the sintered bodies, so that we clarified the porosity distribution of the planetesimal interiors and the porosity dependence of the impact strength. Furthermore, we also made impact-cratering experiments on the layered surface of the rocky planetesimals and collisional experiments on the rubble-pile bodies. Thus, we clarified that the effects of layered structures on the crater formation and the effects of fragment number and fragment size of the rubble-pile on the impact disruption.
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[Journal Article] Direct measurements of hydrogen atom diffusion and the spin temperature of nascent H_2 molecule on amorphous solid water2010
Author(s)
Watanabe, N., Kimura, Y., Kouchi, A., Chigai, T., Hama, T., Pirronello, V.
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Journal Title
Astrophys.J.Lett. 714
Pages: L233-L270
Peer Reviewed
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[Journal Article] Formation of amorphous H_2O ice from the reactions of cold H atoms with solid O_2 at 10K2010
Author(s)
Kouchi, A., Watanabe N., Hidaka, H., Miyauchi, N., Oba, Y., Chigai, T.
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Journal Title
Astron.Soc.Pacific Conf.Ser. 414
Pages: 338
Peer Reviewed
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