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arXiv 1804.06019astro-ph.EP
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木星的原始熵

The Primordial Entropy of Jupiter

Andrew Cumming, Ravit Helled, Julia Venturini

摘要:

巨行星的形成历史决定了它们的原始结构和随后的演化。我们模拟了木星的各种形成路径,以确定其原始熵,并发现一个共同的结果是原木星有非对流区域在其内部。我们使用行星形成模型来计算熵和形成后的光度如何依赖于模型的属性,如固体吸积率和不透明度,并表明气体吸积率及其时间演化在确定熵分布中起着关键作用。预测的木星形成后不久的光度变化的一个因素$2$ - $3$为不同的选择模型参数。我们发现木星内部的熵梯度在形成后持续了$\sim 10\ {\rm Myr}$。我们建议,这些梯度应考虑与重元素成分梯度时,建模木星的演变和内部结构。

英文摘要:

The formation history of giant planets determines their primordial structure and consequent evolution. We simulate various formation paths of Jupiter to determine its primordial entropy, and find that a common outcome is for proto-Jupiter to have non-convective regions in its interior. We use planet formation models to calculate how the entropy and post-formation luminosity depend on model properties such as the solid accretion rate and opacity, and show that the gas accretion rate and its time evolution play a key role in determining the entropy profile. The predicted luminosity of Jupiter shortly after formation varies by a factor of $2$--$3$ for different choices of model parameters. We find that entropy gradients inside Jupiter persist for $\sim 10\ {\rm Myr}$ after formation. We suggest that these gradients should be considered together with heavy-element composition gradients when modeling Jupiter's evolution and internal structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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