气候变化领域集成服务门户(CCPortal): Evidence for post-nebula volatilisation in an exo-planetary body

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DOI	10.1016/j.epsl.2020.116694
	Evidence for post-nebula volatilisation in an exo-planetary body
	Harrison J.H.D.; Shorttle O.; Bonsor A.
发表日期	2021
ISSN	0012821X
卷号	554
英文摘要	The loss and gain of volatile elements during planet formation is key for setting their subsequent climate, geodynamics, and habitability. Two broad regimes of volatile element transport in and out of planetary building blocks have been identified: that occurring when the nebula is still present, and that occurring after it has dissipated. Evidence for volatile element loss in planetary bodies after the dissipation of the solar nebula is found in the high Mn to Na abundance ratio of Mars, the Moon, and many of the solar system's minor bodies. This volatile loss is expected to occur when the bodies are heated by planetary collisions and short-lived radionuclides, and enter a global magma ocean stage early in their history. The bulk composition of exo-planetary bodies can be determined by observing white dwarfs which have accreted planetary material. The abundances of Na, Mn, and Mg have been measured for the accreting material in four polluted white dwarf systems. Whilst the Mn/Na abundances of three white dwarf systems are consistent with the fractionations expected during nebula condensation, the high Mn/Na abundance ratio of GD362 means that it is not (>3σ). We find that heating of the planetary system orbiting GD362 during the star's giant branch evolution is insufficient to produce such a high Mn/Na. We, therefore, propose that volatile loss occurred in a manner analogous to that of the solar system bodies, either due to impacts shortly after their formation or from heating by short-lived radionuclides. We present potential evidence for a magma ocean stage on the exo-planetary body which currently pollutes the atmosphere of GD362. © 2020 Elsevier B.V.
关键词	exo-planetary bodies planetary volatile depletion polluted white dwarf stars post-nebula volatilisation
英文关键词	Extrasolar planets; Moon; Orbits; Radioisotopes; Abundance ratios; Accreting materials; Bulk compositions; Planet formation; Planetary bodies; Planetary materials; Short-lived radionuclides; Volatile elements; White dwarfs; magma; manganese; planetary evolution; radionuclide; sodium; solar system; volatile element; volatilization
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203121
作者单位	Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, United Kingdom; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom
推荐引用方式 GB/T 7714	Harrison J.H.D.,Shorttle O.,Bonsor A.. Evidence for post-nebula volatilisation in an exo-planetary body[J],2021,554.
APA	Harrison J.H.D.,Shorttle O.,&Bonsor A..(2021).Evidence for post-nebula volatilisation in an exo-planetary body.Earth and Planetary Science Letters,554.
MLA	Harrison J.H.D.,et al."Evidence for post-nebula volatilisation in an exo-planetary body".Earth and Planetary Science Letters 554(2021).