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Disruption of a Planet Spiraling into its Host Star
Jia S(贾石)1,2,3,4; Spruit, H. C.2
Source PublicationASTROPHYSICAL JOURNAL
2018-09-10
Volume864Issue:2Pages:12
DOI10.3847/1538-4357/aad77c
Contribution Rank第1完成单位
Indexed BySCI
Keywordplanets and satellites: general planet-star interactions planetary systems stars: general stars: interiors
Abstract

The processes leading to the deformation and destruction of planets spiraling into the convective envelope of their host stars are described. The planet is compressed by ram pressure and deformed into a flattened shape, for which a quantitative model is developed. Compression increases the planet's density contrast with the envelope and its gravitational binding energy. This increases the survivability, especially of gas planets. An estimate is given for the depth of disruption by ram pressure, and for the subsequent fragmentation of the remnants. We show how the debris of rocky or iron planets, instead of mixing through the convection zone (CZ), sinks below the base of the CZ. The timescale of the entire sequence of events is of the order of a few orbital times of the planet. If spiral-in of (partly) icy, rocky or iron planets has happened to the pre-main sequence Sun, then this could account for the higher opacity below the base of the CZ, as inferred from helioseismology.

Funding ProjectMPG-CAS Joint Doctoral Promotion Program (DPP) ; Max Planck Institute for Astrophysics (MPA) ; Natural Science Foundation of China[11521303] ; Natural Science Foundation of China[11390374] ; Chinese Academy of Sciences[KJZD-EW-M06-01]
Funding OrganizationMPG-CAS Joint Doctoral Promotion Program (DPP) ; Max Planck Institute for Astrophysics (MPA) ; Natural Science Foundation of China[11521303, 11390374] ; Chinese Academy of Sciences[KJZD-EW-M06-01]
Language英语
Subject Area天文学
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:000444645600006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSTELLAR METALLICITY ENHANCEMENTS ; GIANT PLANETS ; MASS ; ACCRETION ; CONSUMPTION ; EXOPLANETS ; POLLUTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17929
Collection大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorJia S(贾石)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
4.University of Chinese Academy of Sciences, Beijing 100049, 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
Jia S,Spruit, H. C.. Disruption of a Planet Spiraling into its Host Star[J]. ASTROPHYSICAL JOURNAL,2018,864(2):12.
APA Jia S,&Spruit, H. C..(2018).Disruption of a Planet Spiraling into its Host Star.ASTROPHYSICAL JOURNAL,864(2),12.
MLA Jia S,et al."Disruption of a Planet Spiraling into its Host Star".ASTROPHYSICAL JOURNAL 864.2(2018):12.
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