Dynamical fates of S-type planetary systems in embedded cluster environments
Dynamical fates of S-type planetary systems in embedded cluster environments
复制标题
嵌入式星团环境中 S 型行星系统的动力学命运
DOI：
10.1093/mnras/stac1973
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发表时间：
2022
影响因子：
4.8
通讯作者：
Kaib, Nathan A.
中科院分区：
文献类型：
--
作者：
Ellithorpe, Elizabeth A.;Kaib, Nathan A.
大多数拥有系外行星的双星星系统将在恒星形成集群中度过其生命的第一部分，这可能会推动双行星系统的动态演化。我们进行数值模拟的S型行星，质量和轨道结构类似于太阳系的四个气体巨星，轨道内的影响abinary同伴。双行星系统与嵌入式星团环境同时集成。当来自我们星团环境的扰动将双星近星点推向行星时，我们行星系统的10%会不稳定。尽管我们所有的系统都是以双星轨道初始化的，这将允许在没有星团的情况下有稳定的行星，但这种不稳定还是发生了。在我们的系统中触发的行星-行星散射通常会导致低质量行星的丢失和幸存的高质量行星的偏心率的兴奋。我们的许多不稳定的行星系统也在星团分散之前失去了它们的双星，因此可以伪装成偏心系外行星的宿主，这些行星的整个历史都是孤立的恒星。在我们的模拟中，星团驱动的双星轨道演化也可以产生自旋轨道角不一致的行星系统。这通常是因为行星系统在倾斜双星的影响下像刚性盘一样进动，而那些具有最高自旋轨道角的系统通常会保留它们的双星伴星，并拥有多颗幸存的行星。
The majority of binary star systems that host exoplanets will spend the first portion of their lives within a star-forming cluster that may drive dynamical evolution of the binary-planet system. We perform numerical simulations of S-type planets, with masses and orbital architecture analogous to the Solar system’s four gas giants, orbiting within the influence of abinary companion. The binary-planet system is integrated simultaneously with an embedded stellar cluster environment. ∼10 per cent of our planetary systems are destabilized when perturbations from our cluster environment drive the binary periastron towards the planets. This destabilization occurs despite all of our systems being initialized with binary orbits that would allow stable planets in the absence of the cluster. The planet–planet scattering triggered in our systems typically results in the loss of lower mass planets and the excitement of the eccentricities of surviving higher mass planets. Many of our planetary systems that go unstable also lose their binary companions prior to cluster dispersal and can therefore masquerade as hosts of eccentric exoplanets that have spent their entire histories as isolated stars. The cluster-driven binary orbital evolution in our simulations can also generate planetary systems with misaligned spin–orbit angles. This is typically done as the planetary system precesses as a rigid disc under the influence of an inclined binary, and those systems with the highest spin–orbit angles should often retain their binary companion and possess multiple surviving planets.