A remnant planetary core in the hot-Neptune desert

doi:10.1038/s41586-020-2421-7

GSTDTAP > 地球科学

DOI	10.1038/s41586-020-2421-7
	A remnant planetary core in the hot-Neptune desert
	David J. Armstrong; Thé; o A. Lopez; Vardan Adibekyan; Richard A. Booth; Edward M. Bryant; Karen A. Collins; Magali Deleuil; Alexandre Emsenhuber; Chelsea X. Huang; George W. King; Jorge Lillo-Box; Jack J. Lissauer; Elisabeth Matthews; Olivier Mousis; Louise D. Nielsen; Hugh Osborn; Jon Otegi; Nuno C. Santos; Sé; rgio G. Sousa; Keivan G. Stassun; Dimitri Veras; Carl Ziegler; Jack S. Acton; Jose M. Almenara; David R. Anderson; David Barrado; Susana C. C. Barros; Daniel Bayliss; Claudia Belardi; Francois Bouchy; Cé; sar Briceñ; o; Matteo Brogi; David J. A. Brown; Matthew R. Burleigh; Sarah L. Casewell; Alexander Chaushev; David R. Ciardi; Kevin I. Collins; Knicole D. Coló; n; Benjamin F. Cooke; Ian J. M. Crossfield; Rodrigo F. Dí; az; Elisa Delgado Mena; Olivier D. S. Demangeon; Caroline Dorn; Xavier Dumusque; Philipp Eigmü; ller; Michael Fausnaugh; Pedro Figueira; Tianjun Gan; Siddharth Gandhi; Samuel Gill; Erica J. Gonzales; Michael R. Goad; Maximilian N. Gü; nther; Ravit Helled; Saeed Hojjatpanah; Steve B. Howell; James Jackman; James S. Jenkins; Jon M. Jenkins; Eric L. N. Jensen; Grant M. Kennedy; David W. Latham; Nicholas Law; Monika Lendl; Michael Lozovsky; Andrew W. Mann; Maximiliano Moyano; James McCormac; Farzana Meru; Christoph Mordasini; Ares Osborn; Don Pollacco; Didier Queloz; Liam Raynard; George R. Ricker; Pamela Rowden; Alexandre Santerne; Joshua E. Schlieder; Sara Seager; Lizhou Sha; Thiam-Guan Tan; Rosanna H. Tilbrook; Eric Ting; Sté; phane Udry; Roland Vanderspek; Christopher A. Watson; Richard G. West; Paul A. Wilson; Joshua N. Winn; Peter Wheatley; Jesus Noel Villasenor; Jose I. Vines; Zhuchang Zhan
	2020-07-01
发表期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	583 期号:7814 页码:39-+
文章类型	Article
语种	英语
国家	England; France; Portugal; USA; Switzerland; Spain; Canada; Chile; Italy; Germany; Argentina; Peoples R China; Austria; Australia; North Ireland
英文关键词	The interiors of giant planets remain poorly understood. Even for the planets in the Solar System, difficulties in observation lead to large uncertainties in the properties of planetary cores. Exoplanets that have undergone rare evolutionary processes provide a route to understanding planetary interiors. Planets found in and near the typically barren hot-Neptune ' desert' (1,2)(a region in mass-radius space that contains few planets) have proved to be particularly valuable in this regard. These planets include HD149026b(3), which is thought to have an unusually massive core, and recent discoveries such as LTT9779b(4)and NGTS-4b(5), on which photoevaporation has removed a substantial part of their outer atmospheres. Here we report observations of the planet TOI-849b, which has a radius smaller than Neptune' s but an anomalously large mass of39.1-2.6+2.7Earth masses and a density of5.2-0.8+0.7grams per cubic centimetre, similar to Earth' s. Interior-structure models suggest that any gaseous envelope of pure hydrogen and helium consists of no more than3.9-0.9+0.8 per cent of the total planetary mass. The planet could have been a gas giant before undergoing extreme mass loss via thermal self-disruption or giant planet collisions, or it could have avoided substantial gas accretion, perhaps through gap opening or late formation(6). Although photoevaporation rates cannot account for the mass loss required to reduce a Jupiter-like gas giant, they can remove a small (a few Earth masses) hydrogen and helium envelope on timescales of several billion years, implying that any remaining atmosphere on TOI-849b is likely to be enriched by water or other volatiles from the planetary interior. We conclude that TOI-849b is the remnant core of a giant planet. Observations of TOI-849b reveal a radius smaller than Neptune' s but a large mass of about 40 Earth masses, indicating that the planet is the remnant core of a gas giant.
领域	地球科学 ; 气候变化 ; 资源环境
收录类别	SCI-E
WOS记录号	WOS:000544773600006
WOS关键词	EQUATION-OF-STATE ; LOW-MASS STARS ; GIANT PLANETS ; EXTRASOLAR PLANETS ; OLIGARCHIC GROWTH ; ATMOSPHERIC LOSS ; EVOLUTION ; MODELS ; CONSTRAINTS ; EXOPLANETS
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/281782
专题	地球科学资源环境科学
推荐引用方式 GB/T 7714	David J. Armstrong,Thé,o A. Lopez,et al. A remnant planetary core in the hot-Neptune desert[J]. NATURE,2020,583(7814):39-+.
APA	David J. Armstrong.,Thé.,o A. Lopez.,Vardan Adibekyan.,Richard A. Booth.,...&Zhuchang Zhan.(2020).A remnant planetary core in the hot-Neptune desert.NATURE,583(7814),39-+.
MLA	David J. Armstrong,et al."A remnant planetary core in the hot-Neptune desert".NATURE 583.7814(2020):39-+.