In situ scattering of warm Jupiters and implications for dynamical histories
In situ scattering of warm Jupiters and implications for dynamical histories
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温暖木星的原位散射及其对动力学历史的影响
DOI：
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发表时间：
2019
影响因子：
4.8
通讯作者：
Bonan Pu
中科院分区：
文献类型：
--
作者：
Kassandra R. Anderson;D. Lai;Bonan Pu
许多暖流（WJ）都有相当大的偏心率，这与它们的形成和迁移历史有关。本文探讨了行星间散射对WJ偏心率的激发，从三到四颗不稳定轨道的行星开始，最里面的行星位于（0.1−1）Au范围内。这样的设置是一致的，无论是在原位形成或到达亚au轨道由于光盘迁移。大多数以前的N体实验都集中在几个Au的“冷”彗星上，在那里散射导致行星喷射，有效地激发了幸存行星的偏心率。相比之下，在亚天文单位距离的散射导致碰撞和喷射的混合，幸存行星的最终偏心率尚不清楚。我们进行散射实验的范围内的行星质量和初始间距，包括广义相对论拱点进动的影响，并系统地编目的散射结果和幸存的行星的属性。产生了相当数量的单行星和双行星系统。双行星系统完全通过行星-行星碰撞产生，并且倾向于具有低偏心率/相互倾斜和紧凑的配置。单行星系统是通过喷射和碰撞的组合产生的，导致更高的偏心率。观察到的偏心率分布的孤立WJ（缺乏检测的巨行星的同伴）是一致的，大约60 {\rm %}}$的系统经历了原位散射，其余的经历了一个平静的历史。
Many warm Jupiters (WJs) have substantial eccentricities, which are linked to their formation and migration histories. This paper explores eccentricity excitation of WJs due to planet–planet scattering, beginning with three to four planets in unstable orbits, with the innermost planet placed in the range (0.1−1) au. Such a setup is consistent with either in situ formation or arrival at sub-au orbits due to disc migration. Most previous N-body experiments have focused on ‘cold’ Jupiters at several au, where scattering results in planet ejections, efficiently exciting the eccentricities of surviving planets. In contrast, scattering at sub-au distances results in a mixture of collisions and ejections, and the final eccentricities of surviving planets are unclear. We conduct scattering experiments for a range of planet masses and initial spacings, including the effect of general relativistic apsidal precession, and systematically catalogue the scattering outcomes and properties of surviving planets. A comparable number of one-planet and two-planet systems are produced. Two-planet systems arise exclusively through planet–planet collisions, and tend to have low eccentricities/mutual inclinations and compact configurations. One-planet systems arise through a combination of ejections and collisions, resulting in higher eccentricities. The observed eccentricity distribution of solitary WJs (lacking detection of a giant planet companion) is consistent with roughly $60 {{\ \rm per\ cent}}$ of the systems having undergone in situ scattering, and the remaining experiencing a quiescent history.
DOI：
10.1146/annurev-astro-081811-125523
发表时间：
2012-03
影响因子：
33.3
作者：
W. Kley;R. Nelson
通讯作者：
W. Kley;R. Nelson