An experimental study on planetary evolution using a high-power laser

2014 Fiscal Year Final Research Report

• Project/Area Number: 24244071
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Chiba Institute of Technology
• Principal Investigator: MATSUI Takafumi 千葉工業大学, 惑星探査研究センター, 所長 (80114643)
• 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)
• Project Period (FY): 2012-04-01 – 2015-03-31
• 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

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.

Free Research Field

比較惑星学