arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.04927astro-ph.EPastro-ph.SR
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迁移的热移民的通货膨胀

Inflation of Migrated Hot Jupiters

Marit Mol Lous, Yamila Miguel

摘要:

当一部分表面辐射沉积在内部更深处时,可以在模型中模拟观察到的具有高平衡温度的气体巨行星的低密度。与此同时,迁移理论表明,热彗星形成于远离其宿主恒星的地方,并向内迁移。我们将磁盘迁移的模拟不断变化的内部热彗星,以确定迁移是否有一个长期持久的影响膨胀的行星。我们将迁移行星的半径与原地形成的行星的半径之间的差异量化为半径差异。我们对内部加热背后的物理机制仍然不可知,但假设它与接收到的恒星通量成一定比例。我们发现行星在迁移过程中从主星接收到的辐射变化会影响行星的膨胀和最终半径。当沉积物处于比P=1 bar更高的压力时,具有高比例的能量沉积在内部(> 5%)的模型显示出显著的半径差异。对于1%的较小部分,对于任何沉积深度都没有半径差异。我们表明,一个统一的加热机制可以导致不同的通货膨胀率,这取决于迁移历史。如果即将对气体巨星的平均密度和大气进行的观测能够更好地表明潜在的加热机制,这可能有助于限制此类行星的先前迁移。

英文摘要:

The observed low densities of gas giant planets with a high equilibrium temperature can be simulated in models when a fraction of the surface radiation is deposited deeper in the interior. Meanwhile migration theories suggest that hot Jupiters formed further away from their host-star and migrated inward. We incorporate disk migration in simulations of the evolving interior of hot Jupiters to determine whether migration has a long lasting effect on the inflation of planets. We quantify the difference between the radius of a migrated planet and the radius of a planet that formed in situ as the radius discrepancy. We remain agnostic about the physical mechanism behind interior heating, but assume it scales with the received stellar flux by a certain fraction. We find that the change in irradiation received from the host-star while the planet is migrating can affect the inflation and final radius of the planet. Models with a high fraction of energy deposited in the interior ( > 5%) show a significant radius discrepancy when the deposit is at higher pressures than P=1 bar. For a smaller fraction of 1%, there is no radius discrepancy for any deposit depth. We show that a uniform heating mechanism can cause different rates of inflation, depending on the migration history. If the forthcoming observations on mean densities and atmospheres of gas giants give a better indication of a potential heating mechanism, this could help to constrain the prior migration of such planets.

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