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arXiv 2003.14044astro-ph.EP
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热蒸发器中热驱动的Angular Momentum输运

Thermally Driven Angular Momentum Transport in Hot Jupiters

Cong Yu

摘要:

我们研究了在引力和热力强迫作用下热彗星内部的角动量输运。由于恒星的强辐射,对流区之上形成辐射区。内部重力波在辐射对流边界(RCB)处发射。热响应是动态的,在角动量输运中起着重要作用。通过分离引力和热强迫项,我们确定了增加角动量输运的热效应。对于低频(与行星共转)潮汐频率,角动量通量为正(负)。潮汐的相互作用倾向于将行星推向同步状态。我们发现,与内部重力波相关的角动量输运对RCB和热强迫穿透深度之间的相对位置非常敏感。如果RCB在热强迫穿透深度附近,即使是小幅度的热强迫,热驱动的角动量通量也可能远大于引力强迫引起的通量。热增强的扭矩可以在短短$10^4$年内将行星驱动到同步状态。

英文摘要:

We study the angular momentum transport inside the hot Jupiters under the the influences of gravitational and thermal forcing. Due to the strong stellar irradiation, radiative region develops on top of the convective region. Internal gravity waves are launched at the radiative-convective boundaries (RCBs). The thermal response is dynamical and plays an important role in the angular momentum transport. By separating the gravitational and thermal forcing terms, we identify the thermal effects for increasing the angular momentum transport. For the low frequency (in the co-rotating frame with planets) prograde (retrograde) tidal frequency, the angular momentum flux is positive (negative). The tidal interactions tends to drive the planet to the synchronous state. We find that the angular momentum transport associated with the internal gravity wave is very sensitive to relative position between the RCB and the penetration depth of the thermal forcing. If the RCB is in the vicinity of the thermal forcing penetration depth, even with small amplitude thermal forcing, the thermally driven angular momentum flux could be much larger than the flux induced by gravitational forcing. The thermally enhanced torque could drive the planet to the synchronous state in as short as a few $10^4$ years.

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