The Escape of the Hydrogen-rich Atmosphere of Exoplanets: Mass-loss Rates and the Absorption of Stellar Ly alpha

doi:10.3847/1538-4357/ab29f3

YNAO OpenIR > 恒星物理研究组

	The Escape of the Hydrogen-rich Atmosphere of Exoplanets: Mass-loss Rates and the Absorption of Stellar Ly alpha
	Yan DD(闫冬冬)1,2,3 ; Guo JH(郭建恒)1,2,3
通讯作者	Guo, Jianheng([email protected])
发表期刊	ASTROPHYSICAL JOURNAL
	2019-08-01
卷号	880 期号:2 页码:13
DOI	10.3847/1538-4357/ab29f3
产权排序	第1完成单位
收录类别	SCI
关键词	planets and satellites: atmospheres planets and satellites: composition planets and satellites: physical evolution
摘要	Because mass-loss rates are the function of the mean density of a planet and the stellar irradiation, we calculated about 450 models covering planets with different densities and stellar irradiation. Our results show that the mass-loss rates are dependent on the stellar irradiation and the mean density. However, the mass-loss rates predicted by the energy-limited equation are higher than those predicted by the hydrodynamic model when the integrated extreme ultraviolet flux is higher than similar to 2 x 10(4) erg cm(-2) s(-1). The overestimation can be revised if the kinetic and thermal energies of the escaping atmosphere is included in the energy-limited equation. We found that the heating efficiencies are proportional to the product of the gravitational potential of the planet and the stellar irradiation. The mean absorption radii of stellar irradiation are 1.1-1.2 R-p for Jupiter-like planets, while they vary in the range of 1.1-1.7 R-p for planets with smaller sizes. We evaluated the absorption of stellar Ly alpha by the planetary atmosphere and found that the deeper Ly alpha absorptions tend to be located in the high stellar irradiation and low planetary mean density regions, and vice versa. Moreover, planets with mass-loss rates higher than 10(11) g s(-1) are likely to exhibit obvious absorptions. Finally, we suggest that the absorption levels are related to the inherent properties of exoplanets. The planets with larger sizes (or lower mean density) show strong Ly alpha absorptions. Neptune-like and Earth-like planets tend to have weak Ly alpha absorptions because of their small sizes (or high densities).
资助项目	National Natural Science Foundation of China[11273054] ; National Natural Science Foundation of China[11333006] ; National Natural Science Foundation of China[D030201] ; MUSCLES Treasury Survey High-Level Science Products
项目资助者	National Natural Science Foundation of China[11273054, 11333006, D030201] ; MUSCLES Treasury Survey High-Level Science Products
语种	英语
学科领域	天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
文章类型	Article
出版者	IOP PUBLISHING LTD
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	0004-637X
URL	查看原文
WOS记录号	WOS:000478778000018
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	HYDRODYNAMIC ESCAPE ; RECOMBINATION COEFFICIENTS ; CHARGE-TRANSFER ; ATOMIC DATA ; HD 209458B ; PLANET ; IONS ; WATER ; SIMULATIONS ; RESONANCE
引用统计
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/20534
专题	恒星物理研究组中国科学院天体结构与演化重点实验室
通讯作者	Guo JH(郭建恒)
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, People's Republic of China 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People's Republic of China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kunming 650011, People's Republic of China
第一作者单位	中国科学院云南天文台
通讯作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Yan DD,Guo JH. The Escape of the Hydrogen-rich Atmosphere of Exoplanets: Mass-loss Rates and the Absorption of Stellar Ly alpha[J]. ASTROPHYSICAL JOURNAL,2019,880(2):13.
APA	Yan DD,&Guo JH.(2019).The Escape of the Hydrogen-rich Atmosphere of Exoplanets: Mass-loss Rates and the Absorption of Stellar Ly alpha.ASTROPHYSICAL JOURNAL,880(2),13.
MLA	Yan DD,et al."The Escape of the Hydrogen-rich Atmosphere of Exoplanets: Mass-loss Rates and the Absorption of Stellar Ly alpha".ASTROPHYSICAL JOURNAL 880.2(2019):13.

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