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arXiv 2404.03333astro-ph.EP
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不同光谱型宿主恒星周围超级地球的撞击驱动大气损失

The Impact-driven Atmospheric Loss of Super-Earths around Different Spectral Type Host Stars

Wei Zhong, Cong Yu, Shi Jia, Shang-Fei Liu

AI总结:

本文研究撞击后超级地球的质量损失机制,发现不同光谱型宿主恒星周围行星的撞击驱动大气损失可形成1.3-2.0地球半径的半径谷,与观测一致。

摘要:

行星的质量损失对行星的形成和演化至关重要。半径谷(RV)被认为是由蒸发引起的质量损失所触发。作为半径谷的一种替代机制,本文对撞击后行星的质量损失进行了深入研究。撞击能量转化为行星的内能,增强其核心能量并加速质量损失和轨道迁移。随着宿主恒星从K型变为F型,行星的质量损失和轨道迁移增加。当初始气体与核心质量比(GCR)较小时,K型恒星周围行星的迁移效率会增加,这有助于抑制质量损失,并将行星的质量和半径保持在特定范围内。相反,围绕质量更大的F型恒星运行的行星会经历更显著的质量损失,可能导致完全失去大气,并迁移到周期更长的轨道上。我们的计算表明,不同光谱型宿主恒星周围的行星产生的半径谷范围为1.3-2.0 $R_{\oplus}$,与观测到的1.3-2.6 $R_{\oplus}$范围一致。尽管存在不确定参数,星子撞击可以促进不同光谱型宿主恒星周围行星半径谷的建立。

英文摘要:

The planet's mass loss is important for the planet's formation and evolution. The radius valley (RV) is believed to be triggered by evaporation-induced mass loss. As an alternative mechanism for the RV, the mass loss of post-impact planets is thoroughly investigated in this work. The impact energy is converted to the planet's internal energy, enhancing its core energy and accelerating mass loss and orbital migration. As the host star changes from K-type to F-type, the planet's mass loss and orbital migration increase. When the initial gas-to-core mass ratio (GCR) is small, the migration efficiency for planets around K-type stars will increase, which helps to suppress mass loss and retain the planet's mass and radius within a specific range. On the contrary, planets around more massive F-type stars experience more substantial mass loss, potentially leading to complete mass loss, and migrate to orbits with longer periods. Our calculation shows that planets around different spectral types of host stars give rise to an RV ranging from 1.3-2.0 $R_{\oplus}$, consistent with the observed range of 1.3-2.6 $R_{\oplus}$. Despite the presence of uncertain parameters, the planetesimal impact can promote the RV establishment for planets around host stars of different spectral types.

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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