中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
The Escape of the Hydrogen-rich Atmosphere of Exoplanets: Mass-loss Rates and the Absorption of Stellar Ly alpha

文献类型:期刊论文

作者Yan DD(闫冬冬)1,2,3; Guo JH(郭建恒)1,2,3
刊名ASTROPHYSICAL JOURNAL
出版日期2019-08-01
卷号880期号:2页码:13
ISSN号0004-637X
关键词planets and satellites: atmospheres planets and satellites: composition planets and satellites: physical evolution
DOI10.3847/1538-4357/ab29f3
通讯作者Guo, Jianheng(guojh@ynao.ac.cn)
产权排序第1完成单位
文献子类Article
英文摘要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).
学科主题天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词HYDRODYNAMIC ESCAPE ; RECOMBINATION COEFFICIENTS ; CHARGE-TRANSFER ; ATOMIC DATA ; HD 209458B ; PLANET ; IONS ; WATER ; SIMULATIONS ; RESONANCE
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
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000478778000018
资助机构National Natural Science Foundation of China[11273054, 11333006, D030201] ; MUSCLES Treasury Survey High-Level Science Products
源URL[http://ir.ynao.ac.cn/handle/114a53/20533]  
专题云南天文台_恒星物理研究组
云南天文台_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
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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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来源:云南天文台

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