论文标题
陆地环行星的错位不对作为其形成机制的指标
Misalignment of terrestrial circumbinary planets as an indicator of their formation mechanism
论文作者
论文摘要
通常观察到环形气盘与二进制轨道未对准，这表明行星形成可能会在未对准的磁盘中进行。通过N体模拟，我们考虑了最初未对准的粒子磁盘的环形陆地行星的形成。我们发现，如果以这种方式形成陆地行星，则在没有气体的情况下，它们只能形成靠近共面或接近二进制轨道的极性。圆形二进制形成共面的行星，而偏心二进制周围的行星则根据初始磁盘的未对准和二元偏心率形成共面或极性。陆地行星越庞大，它越对齐（对共面或极地），因为它经历了更多的合并，这平均导致较小的未对准角度。具有非常大初始倾斜的粒子盘的淋巴结进液会导致颗粒之间的高相互倾斜。这会在颗粒之间产生较高的相对速度，从而导致质量弹出，从而完全抑制行星的形成。未对准的陆地环行星可能能够在存在未对准的电路磁盘的情况下形成，这可能有助于在颗粒轨道上结对并保持行星形成过程中的倾斜度。
Circumbinary gas disks are often observed to be misaligned to the binary orbit suggesting that planet formation may proceed in a misaligned disk. With N-body simulations we consider the formation of circumbinary terrestrial planets from a particle disk that is initially misaligned. We find that if terrestrial planets form in this way, in the absence of gas, they can only form close to coplanar or close to polar to the binary orbit. Planets around a circular binary form coplanar while planets around an eccentric binary can form coplanar or polar depending on the initial disk misalignment and the binary eccentricity. The more massive a terrestrial planet is, the more aligned it is (to coplanar or polar) since it has undergone more mergers that lead on average to smaller misalignment angles. Nodal precession of particle disks with very large initial inclinations lead to high mutual inclinations between the particles. This produces high relative velocities between particles that leads to mass ejections that can completely inhibit planet formation. Misaligned terrestrial circumbinary planets may be able to form in the presence of a misaligned circumbinary gas disk that may help to nodally align the particle orbits and maintain the inclination of the planets during their formation.
