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

[PPS05-P11] 火星衛星の捕獲説の再検討：火星原始大気の回転の影響について

*鈴木 智浩²、玄田 英典¹、黒川 宏之¹、樋口 有理可²、井田 茂¹ (1.東京工業大学 地球生命研究所、2.東京工業大学 地球惑星科学系)

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.