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The Effect of Photoionization on the Loss of Water of the Planet
Guo JH(郭建恒)1,2,3
Source PublicationASTROPHYSICAL JOURNAL
2019-02-10
Volume872Issue:1Pages:21
DOI10.3847/1538-4357/aaffd4
Contribution Rank第1完成单位
Indexed BySCI
Keywordplanets and satellites: atmospheres planets and satellites: composition planets and satellites: physical evolution
Abstract

Hydrogen and oxygen can rapidly escape from the atmosphere of planets as a result of the photolysis of water by strong X-ray and ultraviolet (XUV) radiation of a star, which are fundamental to the origin of life and habitability. We developed an ion-atom mixed model to describe the escape of water from planets with water-dominated atmosphere. We showed that the oxygen ions easily escape from the atmosphere with the hydrogen owing to the strong interactions between oxygen ions and hydrogen. The atomic oxygen can escape from the atmosphere with hydrogen in the environment of high XUV irradiation. However, they decouple from hydrogen and oxygen ions with the decrease of XUV flux. We found that the critical XUV level is about 12-16 times or 30-40 times the present value for planets with the mass and separation of Venus and Earth, respectively. Below the critical XUV values, the oxygen can deposit in the atmosphere. Our results show that ions effectively transfer momentum between interacting species. The neglect of ions in the hydrodynamic model results in lower momentum exchanges between hydrogen and oxygen so that the critical XUV values increase by a factor of 2. Finally, our model predicted that the planets with a mass and separation of Venus (Earth) can lose the hydrogen of 21.5 (9.1) Earth oceans and oxygen of 2.6 (0.6) Earth oceans. Thus, the hydrodynamic escape could have dried up the water of their atmosphere in the period of early evolution.

Funding ProjectNational Natural Science Foundation of China[11273054] ; National Natural Science Foundation of China[11333006] ; National Natural Science Foundation of China[D030201]
Funding OrganizationNational Natural Science Foundation of China[11273054] ; National Natural Science Foundation of China[11333006] ; National Natural Science Foundation of China[D030201]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
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:000458897700004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMOIST GREENHOUSE ATMOSPHERES ; HYDRODYNAMIC ESCAPE ; MASS FRACTIONATION ; TERRESTRIAL PLANETS ; EARTH ; HYDROGEN ; SOLAR ; EVOLUTION ; VENUS ; OXYGEN
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/19403
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.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kunming 650011, People's Republic of China
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, 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
Guo JH. The Effect of Photoionization on the Loss of Water of the Planet[J]. ASTROPHYSICAL JOURNAL,2019,872(1):21.
APA Guo JH.(2019).The Effect of Photoionization on the Loss of Water of the Planet.ASTROPHYSICAL JOURNAL,872(1),21.
MLA Guo JH."The Effect of Photoionization on the Loss of Water of the Planet".ASTROPHYSICAL JOURNAL 872.1(2019):21.
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