Examining accretion process of Phobos and Deimos in giant impact-induced disk

Ryuki Hyodo; Hidenori Genda; Sebastien Charnoz; Pascal Rosenblatt

Presentation information

[EJ] Oral

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 3:30 PM - 5:00 PM Convention Hall B (International Conference Hall 2F)

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), Chairperson:Tomohiro Usui(Earth-Life Science Institute, Tokyo Institute of Technology ), Chairperson:Hideaki Miyamoto(University of Tokyo)

4:15 PM - 4:30 PM

[PPS05-10] Examining accretion process of Phobos and Deimos in giant impact-induced disk

★Invited papers

*Ryuki Hyodo^1,2, Hidenori Genda¹, Sebastien Charnoz², Pascal Rosenblatt³ (1.Earth-Life Sicence Institute, Tokyo Institute of Technology, 2.Institut de Physique du Globe de Paris, 3.Royal Observatory of Belgium)

Keywords:Martian moons: Phobos, Deimos

Mars has two small moons, Phobos and Deimos. JAXA is planning a sample return mission from Martian satellite(s) (MMX mission: Martian Moons eXploration). The aim of this work is to understand the origin and evolution of Phobos and Deimos from theoretical aspects in advance of the mission with an expectation that our results will maximize the science return from the mission.

Recently, we have developed a physical model that Phobos and Deimos accreted from a debris formed by a giant impact (Rosenblatt et al. 2016, Nature Geo). However, due to lack of the resolution of the debris disk, the details of the disk composition and thermodynamical information are unclear. In this work, we present detailed analytical arguments and high-resolution SPH simulations to help better understanding of the accretional processes of Phobos and Deimos.