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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
Corresponding AuthorGuo, Jianheng(guojh@ynao.ac.cn)
Source PublicationASTROPHYSICAL JOURNAL
2019-08-01
Volume880Issue:2Pages:13
DOI10.3847/1538-4357/ab29f3
Contribution Rank第1完成单位
Indexed BySCI
Keywordplanets and satellites: atmospheres planets and satellites: composition planets and satellites: physical evolution
AbstractBecause 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).
Funding ProjectNational 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
Funding OrganizationNational Natural Science Foundation of China[11273054, 11333006, D030201] ; MUSCLES Treasury Survey High-Level Science Products
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000478778000018
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordHYDRODYNAMIC ESCAPE ; RECOMBINATION COEFFICIENTS ; CHARGE-TRANSFER ; ATOMIC DATA ; HD 209458B ; PLANET ; IONS ; WATER ; SIMULATIONS ; RESONANCE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/20534
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorGuo JH(郭建恒)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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