DOI: 10.1038/ngeo2866
论文题名: A multiple-impact origin for the Moon
作者: Rufu R. ; Aharonson O. ; Perets H.B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 2 起始页码: 89
结束页码: 94
语种: 英语
Scopus关键词: angular momentum
; Moon
; numerical model
; planetary rotation
; probability
; simulation
; solar system
英文摘要: The hypothesis of lunar origin by a single giant impact can explain some aspects of the Earth-Moon system. However, it is difficult to reconcile giant-impact models with the compositional similarity of the Earth and Moon without violating angular momentum constraints. Furthermore, successful giant-impact scenarios require very specific conditions such that they have a low probability of occurring. Here we present numerical simulations suggesting that the Moon could instead be the product of a succession of a variety of smaller collisions. In this scenario, each collision forms a debris disk around the proto-Earth that then accretes to form a moonlet. The moonlets tidally advance outward, and may coalesce to form the Moon. We find that sub-lunar moonlets are a common result of impacts expected onto the proto-Earth in the early Solar System and find that the planetary rotation is limited by impact angular momentum drain. We conclude that, assuming efficient merger of moonlets, a multiple-impact scenario can account for the formation of the Earth-Moon system with its present properties. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105849
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: Weizmann Institute of Science, Department of Earth and Planetary Sciences, Rehovot, Israel; Technion Israel Institute of Technology, Physics Department, Haifa, Israel
Recommended Citation:
Rufu R.,Aharonson O.,Perets H.B.. A multiple-impact origin for the Moon[J]. Nature Geoscience,2017-01-01,10(2)