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arXiv 2004.01756astro-ph.EP
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具有冰冻内部的天王星的热演化

Thermal Evolution of Uranus with a Frozen Interior

Lars Stixrude, Stefano Baroni, Federico Grasselli

摘要:

天王星的内禀光度比海王星小10倍,这是标准的巨行星演化模型无法捕捉到的观测结果,因为模型假设粘性可以忽略不计。在这里,我们表明,超过一半的天王星内部可能是在一个固体状态,和热演化模型,占这个高粘度区域满足观测到的微弱的天王星通过存储吸积热在内部深处。冰冻的内部也解释了天王星卫星轨道演化所需的品质因数。

英文摘要:

The intrinsic luminosity of Uranus is a factor of 10 less than that of Neptune, an observation that standard giant planetary evolution models, which assume negligible viscosity, fail to capture. Here we show that more than half of the interior of Uranus is likely to be in a solid state, and that thermal evolution models that account for this high viscosity region satisfy the observed faintness of Uranus by storing accretional heat deep in the interior. A frozen interior also explains the quality factor of Uranus required by the evolution of the orbits of its satellites.

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