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Formation of S-type planets in close binaries: scattering-induced tidal capture of circumbinary planets
Gong, Yan-Xiang1,2; Ji, Jianghui1
2018-08-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume478Issue:4Pages:4565-4574
Abstract

Although several S-type and P-type planets in binary systems were discovered in past years, S-type planets have not yet been found in close binaries with an orbital separation not more than 5 au. Recent studies suggest that S-type planets in close binaries may be detected through high-accuracy observations. However, nowadays planet formation theories imply that it is difficult for S-type planets in close binaries systems to form in situ. In this work, we extensively perform numerical simulations to explore scenarios of planet-planet scattering among circumbinary planets and subsequent tidal capture in various binary configurations, to examine whether the mechanism can play a part in producing such kind of planets. Our results show that this mechanism is robust. The maximum capture probability is similar to 10 per cent, which can be comparable to the tidal capture probability of hot Jupiters in single star systems. The capture probability is related to binary configurations, where a smaller eccentricity or a low mass ratio of the binary will lead to a larger probability of capture, and vice versa. Furthermore, we find that S-type planets with retrograde orbits can be naturally produced via capture process. These planets on retrograde orbits can help us distinguish in situ formation and post-capture origin for S-type planet in close binaries systems. The forthcoming missions (PLATO) will provide the opportunity and feasibility to detect such planets. Our work provides several suggestions for selecting target binaries in search for S-type planets in the near future.

Keywordcelestial mechanics binaries: close planetary systems
DOI10.1093/mnras/sty1300
WOS KeywordHIGHLY ECCENTRIC ORBITS ; EXTRASOLAR PLANETS ; ECLIPSING BINARIES ; GIANT PLANETS ; SYSTEMS ; EVOLUTION ; CIRCULARIZATION ; EXOPLANETS ; ACCRETION ; MIGRATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000441288300019
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21759
Collection中国科学院紫金山天文台
Corresponding AuthorGong, Yan-Xiang; Ji, Jianghui
Affiliation1.Chinese Acad Sci, CAS Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Taishan Univ, Coll Phys & Elect Engn, Tai An 271000, Shandong, Peoples R China
Recommended Citation
GB/T 7714
Gong, Yan-Xiang,Ji, Jianghui. Formation of S-type planets in close binaries: scattering-induced tidal capture of circumbinary planets[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,478(4):4565-4574.
APA Gong, Yan-Xiang,&Ji, Jianghui.(2018).Formation of S-type planets in close binaries: scattering-induced tidal capture of circumbinary planets.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,478(4),4565-4574.
MLA Gong, Yan-Xiang,et al."Formation of S-type planets in close binaries: scattering-induced tidal capture of circumbinary planets".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 478.4(2018):4565-4574.
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