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题名: Tidal Evolution of the Kepler Planets with Radii Less than 4 R_
作者: Dong Yao; Ji Jianghui; Wang Su
刊名: Acta Astronomica Sinica
出版日期: 2017
卷号: 58, 期号:4, 页码:31-1-31-11
英文摘要: The planets with a radius<4 R_ observed by the Kepler mission exhibit a unique feature,and propose a challenge for current planetary formation models. The tidal effects between the planet and the host star play an essential role in reconfiguring the final orbits of the short-period planets. In this work, based on various initial Rayleigh distributions of the orbital elements, the final semi-major axis distributions of the planets with a radius<4 R_ after suffering tidal evolution are investigated. Our simulations qualitatively reveal various statistical properties:the peaks of semi- major axes increase with the mean semi-major axis, and the peak amplitude of the final semi-major axis distribution increases with the mean eccentricity for all kinds of semi-major axis distributions. For the case that the mean semi-major axis is about 0.1 au and the mean eccentricity is larger than 0.25, the amplitude peaks of the final semi-major axis are approximately consistent with observations. In addition, the roles of other parameters such as the tidal dissipation factor, stellar, and planetary mass etc, are explored in this study by performing numerical simulations, and it is found that they have little effect on the amplitudes of the peaks. Our simulation results provide some clues of planetary formation for such low-mass planets. We speculate that these low-mass planets are possible to form in a farther place of the proto-planetary disk with a moderate eccentricity via type I migration, and it is possible to form in situ too.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17540
Appears in Collections:行星科学与深空探测实验室_期刊论文

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