气候变化领域集成服务门户(CCPortal): The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper Belt

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DOI	10.1126/science.aay6620
	The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper Belt
	McKinnon W.B.; Richardson D.C.; Marohnic J.C.; Keane J.T.; Grundy W.M.; Hamilton D.P.; Nesvorný D.; Umurhan O.M.; Lauer T.R.; Singer K.N.; Stern S.A.; Weaver H.A.; Spencer J.R.; Buie M.W.; Moore J.M.; Kavelaars J.J.; Lisse C.M.; Mao X.; Parker A.H.; Porter S.B.; Showalter M.R.; Olkin C.B.; Cruikshank D.P.; Elliott H.A.; Gladstone G.R.; Parker J.Wm.; Verbiscer A.J.; Young L.A.; the New Horizons Science Team
发表日期	2020
ISSN	0036-8075
卷号	367 期号:6481
英文摘要	The New Horizons spacecraft's encounter with the cold classical Kuiper Belt object (486958) Arrokoth (provisional designation 2014 MU69) revealed a contact-binary planetesimal. We investigated how Arrokoth formed and found that it is the product of a gentle, low-speed merger in the early Solar System. Its two lenticular lobes suggest low-velocity accumulation of numerous smaller planetesimals within a gravitationally collapsing cloud of solid particles. The geometric alignment of the lobes indicates that they were a co-orbiting binary that experienced angular momentum loss and subsequent merger, possibly because of dynamical friction and collisions within the cloud or later gas drag. Arrokoth's contact-binary shape was preserved by the benign dynamical and collisional environment of the cold classical Kuiper Belt and therefore informs the accretion processes that operated in the early Solar System. Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works
关键词	accretion angular momentum merger planetesimal solar system spacecraft article astronomy cold stress velocity
语种	英语
来源机构	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133681
推荐引用方式 GB/T 7714	McKinnon W.B.,Richardson D.C.,Marohnic J.C.,et al. The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper Belt[J]. Science,2020,367(6481).
APA	McKinnon W.B..,Richardson D.C..,Marohnic J.C..,Keane J.T..,Grundy W.M..,...&the New Horizons Science Team.(2020).The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper Belt.,367(6481).
MLA	McKinnon W.B.,et al."The solar nebula origin of (486958) Arrokoth, a primordial contact binary in the Kuiper Belt".367.6481(2020).