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arXiv 2006.03077astro-ph.EP
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自引力盘中的行星迁移:行星的生存

Planet Migration in Self-Gravitating Discs: Survival of Planets

Sahl Rowther, Farzana Meru

摘要:

我们进行三维SPH模拟研究行星是否可以生存在自引力原行星盘。这里模拟的圆盘使用了一个冷却处方,模拟了一个真正的圆盘,它只在外部区域引力不稳定。我们通过使用简化方法对冷却进行建模来实现这一点,使得盘的外部部分的冷却时间比内部区域的冷却时间短,正如在真实盘中所预期的那样。我们发现巨行星(> M_Sat)和低质量行星(< M_Nep)最初都非常迅速地向内迁移,但在盘的内部引力稳定区域能够减速,而不需要打开一个间隙。这与以前的研究相反,在以前的研究中,冷却是以更简化的方式建模的,无论质量如何,行星都无法减缓它们向内迁移的速度。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,当它们仍然相当巨大和自引力时,可以生存下来。

英文摘要:

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.

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