The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio

doi:10.3847/1538-3881/aa8c7c

	The Scattering Outcomes of Kepler Circumbinary Planets: Planet Mass Ratio
	Gong,Yan-Xiang 1,2; Ji,Jianghui1
刊名	The Astronomical Journal
	2017-10-12
卷号	154 期号:5
关键词	binaries: close methods: numerical planets and satellites: dynamical evolution and stability planets and satellites: individual (Kepler-34b, Kepler-413b)
ISSN号	0004-6256
DOI	10.3847/1538-3881/aa8c7c
英文摘要	Abstract 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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-6256-154-5-AA8C7C
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22769]
专题	中国科学院紫金山天文台
作者单位	1.CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China; yxgong@pmo.ac.cn, jijh@pmo.ac.cn 2.College of Physics and Electronic Engineering, Taishan University, Taian 271000, China
推荐引用方式 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).