| Project/Area Number |
24244071
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Chiba Institute of Technology |
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Principal Investigator |
MATSUI Takafumi 千葉工業大学, 惑星探査研究センター, 所長 (80114643)
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| Co-Investigator(Kenkyū-buntansha) |
SUGITA Seiji 東京大学, 理学系研究科, 教授 (80313203)
KADONO Toshihiko 産業医科大学, 医学部, 教授 (60359198)
NAKAMURA Akiko 神戸大学, 自然科学研究科, 准教授 (40260012)
ARAKAWA Masahiko 神戸大学, 自然科学研究科, 教授 (10222738)
KUROSAWA Kosuke 千葉工業大学, 惑星探査研究センター, 研究員 (80616433)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥48,360,000 (Direct Cost: ¥37,200,000、Indirect Cost: ¥11,160,000)
Fiscal Year 2014: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
Fiscal Year 2012: ¥33,280,000 (Direct Cost: ¥25,600,000、Indirect Cost: ¥7,680,000)
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| Keywords | 惑星形成・進化 / 惑星大気進化 / 高速度天体衝突 / 衝突蒸発 / Hugoniot曲線 / 高強度レーザー / 時間分解分光計測 / 速度干渉計測 / 天体衝突物理学 / 状態方程式 / 惑星初期進化 / 固体惑星初期大気 / 高速分光計測 / 高速撮像計測 / 超高強度レーザー / 二段式軽ガス銃 / 高速分光学 / 固体物性 / 大気の起源 |
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| Outline of Final Research Achievements |
The objective of this study is to determine the Hugoniot curve of forsterite, one of the most important silicates, in the density-pressure-temperature-entropy space. We conducted a series of laser shock experiments using a high power laser and obtained shock-induced radiance and shock velocity in forsterite samples under 400-900 GPa compression. Our results indicate that the degree of vaporization of forsterite after shock compression is much higher than previously thought. Hypervelocity impacts at >30 km/s on the Hadean Earth may produce a transient O2-rich atmosphere. This hypothesis can be tested by the geochemical analyses of impact-related geologic record.
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