DOI: 10.1038/ngeo2742
论文题名: Accretion of Phobos and Deimos in an extended debris disc stirred by transient moons
作者: Rosenblatt P. ; Charnoz S. ; Dunseath K.M. ; Terao-Dunseath M. ; Trinh A. ; Hyodo R. ; Genda H. ; Toupin S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 8 起始页码: 581
结束页码: 583
语种: 英语
Scopus关键词: debris flow
; impact structure
; Mars
; marsh
; Moon
; numerical model
; planetary evolution
英文摘要: Phobos and Deimos, the two small satellites of Mars, are thought either to be asteroids captured by the planet or to have formed in a disc of debris surrounding Mars following a giant impact. Both scenarios, however, have been unable to account for the current Mars system. Here we use numerical simulations to suggest that Phobos and Deimos accreted from the outer portion of a debris disc formed after a giant impact on Mars. In our simulations, larger moons form from material in the denser inner disc and migrate outwards due to gravitational interactions with the disc. The resulting orbital resonances spread outwards and gather dispersed outer disc debris, facilitating accretion into two satellites of sizes similar to Phobos and Deimos. The larger inner moons fall back to Mars after about 5 million years due to the tidal pull of the planet, after which the two outer satellites evolve into Phobos- and Deimos-like orbits. The proposed scenario can explain why Mars has two small satellites instead of one large moon. Our model predicts that Phobos and Deimos are composed of a mixture of material from Mars and the impactor. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105953
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Royal Observatory of Belgium, Brussels, Belgium; Institut de Physique du Globe, Université Paris Diderot, CEA/CNRS, Paris, France; Institut de Physique de Rennes, Université de Rennes 1, CNRS, Rennes Cedex, France; Kobe University, Kobe, Japan; Earth Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan; Université Libre de Bruxelles, Brussels, Belgium
Recommended Citation:
Rosenblatt P.,Charnoz S.,Dunseath K.M.,et al. Accretion of Phobos and Deimos in an extended debris disc stirred by transient moons[J]. Nature Geoscience,2016-01-01,9(8)