Orbital stability of two circumbinary planets around misaligned eccentric binaries
Orbital stability of two circumbinary planets around misaligned eccentric binaries
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两颗围绕错位偏心双星的绕双星行星的轨道稳定性
DOI：
10.1093/mnras/stad739
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发表时间：
2023
影响因子：
4.8
通讯作者：
Chen C
中科院分区：
文献类型：
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作者：
Chen C
通过体模拟，我们研究了由两个非零质量行星组成的倾斜环绕双星行星系统的稳定性。这些行星最初处于彼此共面的圆形轨道上，如果它们形成在平坦但倾斜的环双星气盘中，并且在远小于盘节点进动周期的时间差内与盘解耦，那么正如预期的那样。我们限制稳定的多行星环绕双星系统的参数。行星与行星以及行星与双星的相互作用都会导致复杂的行星倾斜振荡，从而破坏一颗或两颗行星的轨道的稳定。由于这两种相互作用之间的相互作用，该系统比这些单独相互作用的影响要不稳定得多。系统的稳定性对双星偏心率、轨道倾角和两颗绕双星行星的半长轴敏感。内行星的半长轴为 ，而双星的半长轴为 ，如果外行星位于与内行星的平均运动共振 2:1 之外，则系统通常是稳定的。对于较大的内行星半长轴，系统不太稳定，因为 von-Zeipel-Kozai-Lidov 机制起着重要作用，特别是对于低双偏心率情况。对于不稳定的情况，最可能的结果是一颗行星被弹出，而另一颗行星仍然束缚在高度偏心的轨道上。因此，我们认为这种不稳定性是产生自由漂浮行星的有效机制。
Withn-body simulations, we investigate the stability of tilted circumbinary planetary systems consisting of two non-zero mass planets. The planets are initially in circular orbits that are coplanar to each other, as would be expected if they form in a flat but tilted circumbinary gas disc and decouple from the disc within a time difference that is much less than the disc nodal precession period. We constrain the parameters of stable multiple planet circumbinary systems. Both planet–planet and planet–binary interactions can cause complex planet tilt oscillations that can destabilize the orbits of one or both planets. The system is considerably more unstable than the effects of these individual interactions would suggest, due to the interplay between these two interactions. The stability of the system is sensitive to the binary eccentricity, the orbital tilt, and the semimajor axes of the two circumbinary planets. With an inner planet semimajor axis of, whereabis the semimajor axis of the binary, the system is generally stable if the outer planet is located at, beyond the 2:1 mean motion resonance with the inner planet. For larger inner planet semimajor axis, the system is less stable because the von-Zeipel–Kozai–Lidov mechanism plays a significant role, particularly for low binary-eccentricity cases. For the unstable cases, the most likely outcome is that one planet is ejected and the other remains bound on a highly eccentric orbit. Therefore, we suggest that this instability is an efficient mechanism for producing free-floating planets.