论文标题
合并的行星旋转和倾斜
Planetary Spin and Obliquity from Mergers
论文作者
论文摘要
在具有足够小的星际间距的行星系统中，紧密相遇会导致行星碰撞/合并或弹射。我们使用数值模拟和分析建模以统计方式研究了两个巨型行星的合并产品的自旋特性。行星碰撞导致迅速旋转的物体和广泛的倾斜范围。我们发现，在两行星散射的典型条件下，合并产品的旋转幅度$ s $和倾斜的$θ_{\ rm sl} $的分布具有简单的分析形式：$ f_ {s} \ propto s $ s $ s $ s $ s $ s $ and $ f _ {\cosθ_{\cosθ_{\ rm sl { SL}）^{ - 1/2} $。尽管参数研究，但我们确定了自旋和倾斜分析分布的有效性状态。由于行星合并是行星环形散射的主要结果，因此对系外行星的旋转/斜率签名的观察搜索将对行星系统的动态历史产生重要限制。
In planetary systems with sufficiently small inter-planet spacing, close encounters can lead to planetary collisions/mergers or ejections. We study the spin property of the merger products of two giant planets in a statistical manner using numerical simulations and analytical modeling. Planetary collisions lead to rapidly rotating objects and a broad range of obliquities. We find that, under typical conditions for two-planet scatterings, the distributions of spin magnitude $S$ and obliquity $Θ_{\rm SL}$ of the merger products have simple analytical forms: $f_{S} \propto S$ and $f_{\cosΘ_{\rm SL}} \propto (1-\cos^2Θ_{\rm SL})^{-1/2}$. Though parameter studies, we determine the regime of validity for the analytical distributions of spin and obliquity. Since planetary mergers is a major outcome of planet-planet scatterings, observational search for the spin/obliquity signatures of exoplanets would provide important constraints on the dynamical history of planetary systems.
