气候变化领域集成服务门户(CCPortal): Large planets may not form fractionally large moons

CCPortal

DOI	10.1038/s41467-022-28063-8
	Large planets may not form fractionally large moons
	Nakajima M.; Genda H.; Asphaug E.; Ida S.
发表日期	2022
ISSN	2041-1723
卷号	13 期号:1
英文摘要	One of the unique aspects of Earth is that it has a fractionally large Moon, which is thought to have formed from a Moon-forming disk generated by a giant impact. The Moon stabilizes the Earth’s spin axis at least by several degrees and contributes to Earth’s stable climate. Given that impacts are common during planet formation, exomoons, which are moons around planets in extrasolar systems, should be common as well, but no exomoon has been confirmed. Here we propose that an initially vapor-rich moon-forming disk is not capable of forming a moon that is large with respect to the size of the planet because growing moonlets, which are building blocks of a moon, experience strong gas drag and quickly fall toward the planet. Our impact simulations show that terrestrial and icy planets that are larger than ~1.3−1.6R⊕ produce entirely vapor disks, which fail to form a fractionally large moon. This indicates that (1) our model supports the Moon-formation models that produce vapor-poor disks and (2) rocky and icy exoplanets whose radii are smaller than ~1.6R⊕ are ideal candidates for hosting fractionally large exomoons. © 2022, The Author(s).
语种	英语
scopus关键词	climate change; Moon; simulation; article; astronomy; simulation; vapor
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/251247
作者单位	Department of Earth and Environmental Sciences, University of Rochester, P.O. Box 270221, Rochester, NY 14627, United States; Department of Physics and Astronomy, University of Rochester, P.O. Box 270171, Rochester, NY 14627, United States; Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1, Ookayama, Tokyo, Meguro-ku, 152-8550, Japan; University of Arizona, Lunar and Planetary Laboratory, 1629 E. University Blvd, Tucson, AZ 85721, United States
推荐引用方式 GB/T 7714	Nakajima M.,Genda H.,Asphaug E.,et al. Large planets may not form fractionally large moons[J],2022,13(1).
APA	Nakajima M.,Genda H.,Asphaug E.,&Ida S..(2022).Large planets may not form fractionally large moons.Nature Communications,13(1).
MLA	Nakajima M.,et al."Large planets may not form fractionally large moons".Nature Communications 13.1(2022).