论文标题
通过与伴侣行星的共振相互作用来雕刻环球行星的大小分布
Sculpting the circumbinary planet size distribution through resonant interactions with companion planets
论文作者
论文摘要
两个行星的共振锁定是收敛盘迁移的预期结果。行星随后以谐振对迁移。在环形行星的背景下，光盘在内部被二进制截断。如果只有一个行星，那么这个内部光盘边缘将提供自然的停车位。但是，对于在共振中一起迁移的两个行星，在圆盘边缘停止的内行星与外部行星之间将存在张力，而外行星继续向内扭转。在本文中，我们研究了这种效果，表明结果是行星态质量比的函数。较小的外行星倾向于将其停放在稳定的外部2：1或3：2与内行星的共鸣，该行星本身保持在圆盘边缘附近。相等或更大的质量外行星倾向于将内行星推到圆盘边缘并太近的二进制中，导致它被弹出或有时翻转到外部轨道上。我们的模拟表明，此过程可能会解释观察到的小（<3地球半径）环形行星的缺乏，因为经常弹出小行星或在长期轨道上留下的小行星，而对于该轨道，其可能性较小。这也可能是生产自由浮动行星和诸如`oumuamua之类的星际闯入者的有效机制。
Resonant locking of two planets is an expected outcome of convergent disc migration. The planets subsequently migrate together as a resonant pair. In the context of circumbinary planets, the disc is truncated internally by the binary. If there were only a single planet, then this inner disc edge would provide a natural parking location. However, for two planets migrating together in resonance there will be a tension between the inner planet stopping at the disc edge, and the outer planet continuing to be torqued inwards. In this paper we study this effect, showing that the outcome is a function of the planet-planet mass ratio. Smaller outer planets tend to be parked in a stable exterior 2:1 or 3:2 resonance with the inner planet, which itself remains near the disc edge. Equal or larger mass outer planets tend to push the inner planet past the disc edge and too close to the binary, causing it to be ejected or sometimes flipped to an exterior orbit. Our simulations show that this process may explain an observed dearth of small (< 3 Earth radii) circumbinary planets, since small planets are frequently ejected or left on long-period orbits, for which transit detection is less likely. This may also be an efficient mechanism for producing free-floating planets and interstellar interlopers like `Oumuamua.
