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Near Mean-motion Resonances in the System Observed by Kepler: Affected by Mass Accretion and Type I Migration
Wang, Su; Ji, Jianghui
2017-12-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume154Issue:6Pages:11
Corresponding AuthorWang, Su(wangsu@pmo.ac.cn)
AbstractThe Kepler mission has released over 4496 planetary candidates, among which 3483 planets have been confirmed as of 2017 April. The statistical results of the planets show that there are two peaks around 1.5 and 2.0 in the distribution of orbital period ratios. The observations indicate that plenty of planet pairs could have first been captured into mean-motion resonances (MMRs) in planetary formation. Subsequently, these planets depart from exact resonant locations to be near-MMR configurations. Through type I migration, two low-mass planets have a tendency to be trapped in first-order MMRs (2:1 or 3:2 MMRs); however, two scenarios of mass accretion of planets and potential outward migration play important roles in reshaping their final orbital configurations. Under the scenario of mass accretion, the planet pairs can cross 2:1 MMRs and then enter into 3:2 MMRs, especially for the inner pairs. With such a formation scenario, the possibility that two planets are locked into 3:2 MMRs can increase if they are formed in a flat disk. Moreover, the outward migration can make planets have a high likelihood to be trapped into 3:2 MMRs. We perform additional runs to investigate the mass relationship for those planets in three-planet systems, and we show that two peaks near 1.5 and 2.0 for the period ratios of two planets can be easily reproduced through our formation scenario. We further show that the systems in chain resonances (e.g., 4:2:1, 3:2:1, 6:3:2, and 9:6:4 MMRs), have been observed in our simulations. This mechanism can be applicable to understand the formation of systems of Kepler-48, Kepler-53, Kepler-100, Kepler-192, Kepler-297, Kepler-399, and Kepler-450.
Keywordplanetary systems planets and satellites: formation protoplanetary disks
DOI10.3847/1538-3881/aa9216
WOS KeywordPLANETS ORBITING GJ-876 ; T-TAURI STARS ; TERRESTRIAL PLANETS ; LAPLACE RESONANCE ; TORQUE FORMULA ; DISK ; PROTOPLANETS ; ORIGIN ; CONFIGURATION ; SIMULATIONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000415867300004
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22077
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Su
AffiliationChinese Acad Sci, Purple Mt Observ, CAS Key Lab Planetary Sci, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wang, Su,Ji, Jianghui. Near Mean-motion Resonances in the System Observed by Kepler: Affected by Mass Accretion and Type I Migration[J]. ASTRONOMICAL JOURNAL,2017,154(6):11.
APA Wang, Su,&Ji, Jianghui.(2017).Near Mean-motion Resonances in the System Observed by Kepler: Affected by Mass Accretion and Type I Migration.ASTRONOMICAL JOURNAL,154(6),11.
MLA Wang, Su,et al."Near Mean-motion Resonances in the System Observed by Kepler: Affected by Mass Accretion and Type I Migration".ASTRONOMICAL JOURNAL 154.6(2017):11.
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