论文标题
行星迁移在自我磨削光盘中：行星的生存
Planet Migration in Self-Gravitating Discs: Survival of Planets
论文作者
论文摘要
我们进行了三维SPH模拟，以研究行星是否可以在自我磨削的原球盘中生存。在此建模的碟片使用冷却处方，该冷却处方模仿真实的光盘，该光盘仅在外部区域在重力上不稳定。我们通过使用简化的方法对冷却进行建模来做到这一点，以使光盘外部的冷却时间短于内部区域，如真实的盘中所预期的那样。我们发现，巨型（> M_SAT）和低质量（<M_NEP）行星最初非常迅速地向内迁移，但能够在圆盘的内部重力稳定区域放慢速度，而无需张开间隙。这与以前的研究相反，在先前的研究中，冷却以更简化的方式建模，而无论质量如何，行星都无法减慢其内向迁移。这表明了热力学对行星迁移的重要影响。在更广泛的背景下，这些结果表明，在圆盘演化的早期阶段形成的行星（当它们仍然相当庞大且自我磨损时）可以生存。
We carry out three-dimensional SPH simulations to study whether planets can survive in self-gravitating protoplanetary discs. The discs modelled here use a cooling prescription that mimics a real disc which is only gravitationally unstable in the outer regions. We do this by modelling the cooling using a simplified method such that the cooling time in the outer parts of the disc is shorter than in the inner regions, as expected in real discs. We find that both giant (> M_Sat) and low mass (< M_Nep) planets initially migrate inwards very rapidly, but are able to slow down in the inner gravitationally stable regions of the disc without needing to open up a gap. This is in contrast to previous studies where the cooling was modelled in a more simplified manner where regardless of mass, the planets were unable to slow down their inward migration. This shows the important effect the thermodynamics has on planet migration. In a broader context, these results show that planets that form in the early stages of the discs' evolution, when they are still quite massive and self-gravitating, can survive.
