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arXiv 2108.01675astro-ph.EP
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潮汐畸变的Barytropes和Roche极限及其对WASP-12 b的应用

Tidally distorted barytropes and their Roche limits, with application to WASP-12b

Victoria Antonetti, Jeremy Goodman

摘要:

热木星WASP-12 b被发现处于1.09天的轨道上。从凌日和径向速度数据推断出的行星平均密度接近洛希极限;到底有多近取决于行星不确定的内部结构。也有光谱学证据表明质量损失。我们准确地计算罗氏密度的假设同步旋转$n=1$多面体,并发现这是只有$15-20\%$低于观测估计的平均密度。我们讨论了隐含的形状的行星,它的寿命完全破坏之前,其目前的质量损失率的基础上,我们改进的潮汐模型。然而,目前的质量损失率对行星大气层的不透明度和温度分布的敏感程度至少与其内部结构一样。

英文摘要:

The hot Jupiter WASP-12b has been found to be on a decaying 1.09-day orbit. The mean density of the planet inferred from transit and radial-velocity data is near its Roche limit; just how near depends on the planet's uncertain internal structure. There is also spectroscopic evidence of mass loss. We accurately calculate the Roche density on the assumption of a synchronously rotating $n=1$ polytrope, and find this to be only $15-20\%$ below the observational estimates for the mean density. We discuss the implied shape of the planet, its lifetime before complete disruption, and its current rate of mass loss based on our improved tidal model. The present mass-loss rate is at least as sensitive to the opacity and temperature profiles of the planet's atmosphere as to its internal structure, however.

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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