Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

U (Union ) » Union

[U-04] Capture the fast process in Earth and planetary science

Wed. May 29, 2019 3:30 PM - 5:00 PM 103 (1F)

convener:Takashi Yoshino(Institute for Planetary Materials, Okayama University), Yoshinori Tange(Japan Synchrotron Radiation Research Institute), Chairperson:Takashi Yoshino(Okayama University), Yoshio Kono(愛媛大学地球深部ダイナミクスセンター), Yoshinori Tange

3:30 PM - 3:45 PM

[U04-07] Chemical reaction processes bridge between asteroid Ryugu and early evolution of Earth

★Invited Papers

*Seiji Sugita1,3, Hideharu Kuwahara2, Kosuke Kurosawa3 (1.Department of Earth and Planetary Science, Graduate School of Science Sciece, The University of Tokyo, 2.Ehime University, 3.Chiba Institute of Technology)

Keywords:Asteroid missions, Hypervelocity impacts, Impact vapor clouds, Atmospheric entry physics

JAXA's Hayabusa2 has arrived at asteroid Ryugu and is uncovering many new aspects of the primitive asteroid, such as extremly low albedo (4.5+/- 0.1%), flat spectra (Cb type), young resurfacing age (<10^6 yr for the top 1 m layer), high boulder number dentity (x2 of Itokawa) and low abundance of hydrated minerals. These pieces of information is very importance for understanding the early evolution of inner solar system and Earth's surface environment. In particular, what happens upon hypervelocity impacts of such bodies is important for understading the atmospheric chemistry of early Earth. In this study, we review atmospheric entry processes, high-temperature chemistry processes, and discuss the implications of recent results on asteroid missions, such as Hayabusa2 and OSIRIS-REx, for Earth's early evolution.