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THE INFLUENCE OF THE EXTREME ULTRAVIOLET SPECTRAL ENERGY DISTRIBUTION ON THE STRUCTURE AND COMPOSITION OF THE UPPER ATMOSPHERE OF EXOPLANETS
Guo JH(郭建恒)1,2; Ben-Jaffel, Lotfi3,4; Guo, JH
发表期刊ASTROPHYSICAL JOURNAL
2016-02-20
卷号818期号:2
DOI10.3847/0004-637X/818/2/107
产权排序第1完成单位
收录类别SCI
关键词Planets And Satellites: Atmospheres Ultraviolet: Stars Planets And Satellites: Individual (Hd 209458b Gj 436b Hd 189733b Kepler-11b)
摘要By varying the profiles of stellar extreme ultraviolet (EUV) spectral energy distributions (SEDs), we tested the influences of stellar EUV SEDs on the physical and chemical properties of an escaping atmosphere. We apply our model to study four exoplanets: HD 189733b, HD 209458b, GJ 436b, and Kepler-11b. We find that the total mass loss rates of an exoplanet, which are determined mainly by the integrated fluxes, are moderately affected by the profiles of the EUV SED, but the composition and species distributions in the atmosphere can be dramatically modified by the different profiles of the EUV SED. For exoplanets with a high hydrodynamic escape parameter (.), the amount of atomic hydrogen produced by photoionization at different altitudes can vary by one to two orders of magnitude with the variation of stellar EUV SEDs. The effect of photoionization of H is prominent when the EUV SED is dominated by the low-energy spectral region (400-900 angstrom), which pushes the transition of H/H+ to low altitudes. In contrast, the transition of H/H+ moves to higher altitudes when most photons are concentrated in the high-energy spectral region (50-400 angstrom). For exoplanets with a low., the lower temperatures of the atmosphere make many chemical reactions so important that photoionization alone can no longer determine the composition of the escaping atmosphere. For HD 189733b, it is possible to explain the time variability of Ly alpha between 2010 and 2011 by a change in the EUV SED of the host K-type star, yet invoking only thermal H I in the atmosphere.
项目资助者National Natural Science Foundation of China(11273054, 11333006) ; CNES ; French Embassy in China (Programme Decouverte Chine)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2016-03-02
WOS记录号WOS:000372302800006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ESCAPING PARTICLE FLUXES ; M5 V STARS ; HD 209458B ; MASS-LOSS ; HOT JUPITERS ; DISSOCIATIVE-RECOMBINATION ; PLANETARY-ATMOSPHERES ; EXTRASOLAR PLANETS ; ANISOTROPIC WINDS ; GIANT PLANETS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9359
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
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, CAS, Kunming 650011, China
3.Sorbonne Universités, UPMC Univ. Paris 6 et CNRS, UMR 7095, Institut Astrophysique de Paris, F-75014 Paris, France
4.Visiting Research Scientist, University of Arizona, Lunar & Planetary Laboratory, Tucson, AZ, USA
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Guo JH,Ben-Jaffel, Lotfi,Guo, JH. THE INFLUENCE OF THE EXTREME ULTRAVIOLET SPECTRAL ENERGY DISTRIBUTION ON THE STRUCTURE AND COMPOSITION OF THE UPPER ATMOSPHERE OF EXOPLANETS[J]. ASTROPHYSICAL JOURNAL,2016,818(2).
APA Guo JH,Ben-Jaffel, Lotfi,&Guo, JH.(2016).THE INFLUENCE OF THE EXTREME ULTRAVIOLET SPECTRAL ENERGY DISTRIBUTION ON THE STRUCTURE AND COMPOSITION OF THE UPPER ATMOSPHERE OF EXOPLANETS.ASTROPHYSICAL JOURNAL,818(2).
MLA Guo JH,et al."THE INFLUENCE OF THE EXTREME ULTRAVIOLET SPECTRAL ENERGY DISTRIBUTION ON THE STRUCTURE AND COMPOSITION OF THE UPPER ATMOSPHERE OF EXOPLANETS".ASTROPHYSICAL JOURNAL 818.2(2016).
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