The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio
Gong,Yan-Xiang1,2; Ji,Jianghui1
Source PublicationThe Astronomical Journal
AbstractAbstract Recent studies reveal that the free eccentricities of Kepler-34b and Kepler-413b are much larger than their forced eccentricities, implying that scattering events may take place in their formation. The observed orbital configuration of Kepler-34b cannot be well reproduced in disk-driven migration models, whereas a two-planet scattering scenario can play a significant role of shaping the planetary configuration. These studies indicate that circumbinary planets discovered by Kepler may have experienced scattering process. In this work, we extensively investigate the scattering outcomes of circumbinary planets focusing on the effects of planet mass ratio. We find that the planetary mass ratio and the the initial relative locations of planets act as two important parameters that affect the eccentricity distribution of the surviving planets. As an application of our model, we discuss the observed orbital configurations of Kepler-34b and Kepler-413b. We first adopt the results from the disk-driven models as the initial conditions, then simulate the scattering process that occurs in the late evolution stage of circumbinary planets. We show that the present orbital configurations of Kepler-34b and Kepler-413b can be well reproduced when considering a two unequal-mass planet ejection model. Our work further suggests that some of the currently discovered circumbinary single-planet systems may be survivors of original multiple-planet systems. The disk-driven migration and scattering events occurring in the late stage both play an irreplaceable role in sculpting the final systems.
Keywordbinaries: close methods: numerical planets and satellites: dynamical evolution and stability planets and satellites: individual (Kepler-34b, Kepler-413b)
WOS IDIOP:0004-6256-154-5-aa8c7c
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China;,
2.College of Physics and Electronic Engineering, Taishan University, Taian 271000, China
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GB/T 7714
Gong,Yan-Xiang,Ji,Jianghui. The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio[J]. The Astronomical Journal,2017,154(5).
APA Gong,Yan-Xiang,&Ji,Jianghui.(2017).The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio.The Astronomical Journal,154(5).
MLA Gong,Yan-Xiang,et al."The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio".The Astronomical Journal 154.5(2017).
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