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arXiv 0712.3250astro-ph
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木星和超级地球嵌入气体盘

Jupiter and Super-Earth embedded in a gaseous disc

E. Podlewska, E. Szuszkiewicz

备注：
10 pages with 8 figures, accepted for publication in MNRAS
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摘要：

在本文中，我们研究了一对相互作用的行星-木星质量的行星和一个超级地球与5.5地球质量-轨道太阳型恒星和嵌入在一个气体原行星盘的演化。我们重点研究了由行星-盘相互作用引起的I型和II型轨道迁移的影响，导致木星在一阶平均运动共振中捕获超级地球。通过全二维流体动力学模拟，研究了超级地球相对于木星位于内轨道的共振系统的稳定性。我们的主要动机是确定系统中存在气体巨星时的超级地球行为。研究发现，木星捕获超级地球的内部存在3：2或4：3的平均运动共振，这种构型的稳定性取决于行星的初始位置和偏心率的演化。如果行星轨道的初始间隔大于或接近精确共振所需的距离，那么最终结果是这对行星的迁移率与气体巨星的迁移率相似，至少在我们的模拟时间内是如此。否则，我们观察到超级地球从圆盘上散射。沉浸在气体盘的行星的演变进行了比较，在经典的三体问题的情况下，当磁盘是缺席的行为。

英文摘要：

In this paper we investigate the evolution of a pair of interacting planets - a Jupiter mass planet and a Super-Earth with the 5.5 Earth masses - orbiting a Solar type star and embedded in a gaseous protoplanetary disc. We focus on the effects of type I and II orbital migrations, caused by the planet-disc interaction, leading to the Super-Earth capture in first order mean motion resonances by the Jupiter. The stability of the resulting resonant system in which the Super-Earth is on the internal orbit relatively to the Jupiter has been studied numerically by means of full 2D hydrodynamical simulations. Our main motivation is to determine the Super-Earth behaviour in the presence of the gas giant in the system. It has been found that the Jupiter captures the Super-Earth into the interior 3:2 or 4:3 mean motion resonances and the stability of such configurations depends on the initial planet positions and eccentricity evolution. If the initial separation of planet orbits is larger or close to that required for the exact resonance than the final outcome is the migration of the pair of planets with the rate similar to that of the gas giant at least for time of our simulations. Otherwise we observe a scattering of the Super-Earth from the disc. The evolution of planets immersed in the gaseous disc has been compared with their behaviour in the case of the classical three-body problem when the disc is absent.

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