JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Poster

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS05] [EJ] Mars and Mars system: results from a broad spectrum of Mars studies and aspects for future missions

Sat. May 20, 2017 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Hideaki Miyamoto(University of Tokyo), Tomohiro Usui(Earth-Life Science Institute, Tokyo Institute of Technology ), Ayako Matsuoka(Research Division for Space Plasma, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Sushil K Atreya(University of Michigan Ann Arbor)

[PPS05-P11] Revisiting capture origin of Martian satellites: Effects of rotating proto-Martian atmosphere

*Tomohiro Suzuki2, Hidenori Genda1, Hiroyuki Kurokawa1, Arika Higuchi2, Shigeru Ida1 (1.Earth-Life Sicence Institute, Tokyo Institute of Technology, 2.Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

Two small satellites (Phobos and Deimos) are orbiting Mars on the Martian equatorial plane with nearly circular orbit. Two leading hypotheses for origin of Martian satellites have been discussed so far; capture origin and giant impact origin. Spectral features of Phobos and Deimos are similar to C-type or D-type asteroid, which supports capture origin, while their orbital features (especially low inclinations) do not support capture origin, but support giant impact origin. Here we focus on capture origin, and examine the effect of rotating proto-Martian atmosphere on damping their inclination via gas drag. We reexamine the possibility for capture origin.