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arXiv 2109.08562astro-ph.SRastro-ph.EPphysics.flu-dyn
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低质量恒星和巨大气态行星对流包层中潮汐的非线性模拟

Nonlinear simulations of tides in the convective envelopes of low-mass stars and giant gaseous planets

A. Astoul, A. J. Barker

摘要:

在接近的二体天体物理系统中,例如双星或热木星系统,潮汐相互作用经常驱动长期时间尺度上的动力学演化。许多主星和可能的巨型气态行星都有对流包层。伴随物的潮汐势产生的潮汐流可以通过粘性摩擦消散,导致对流壳层内和与伴随物的角动量的重新分配和交换。在最紧密的系统中,非线性效应可能对潮汐耗散产生重大影响,并以纬向流的形式触发差异旋转,如先前的研究所示。在这种情况下,我们研究如何增加非线性影响潮汐流的特性,能量和角动量平衡,使用3D非线性模拟的绝热和不可压缩的对流壳。在我们的研究中,我们选择了一个身体强迫平衡潮汐(准流体静力学潮流分量)的作用,通过有效的强迫激发潮汐惯性波的球壳。在此设置中,我们展示了新的结果存储在纬向流,角动量演化的能量的振幅,其后果潮汐耗散在低质量恒星和巨型气态行星的信封。

英文摘要:

In close two-body astrophysical systems, such as binary stars or Hot Jupiter systems, tidal interactions often drive dynamical evolution on secular timescales. Many host stars and presumably giant gaseous planets feature a convective envelope. Tidal flows generated therein by the tidal potential of the companion can be dissipated through viscous friction, leading to the redistribution and exchange of angular momentum within the convective shell and with the companion, respectively. In the tightest systems, nonlinear effects are likely to have a significant impact on the tidal dissipation and trigger differential rotation in the form of zonal flows, as has been shown in previous studies. In this context, we investigate how the addition of nonlinearities affect the tidal flow properties, and energy and angular momentum balances, using 3D nonlinear simulations of an adiabatic and incompressible convective shell. In our study, we have chosen a body forcing where the equilibrium tide (the quasi-hydrostatic tidal flow component) acts via an effective forcing to excite tidal inertial waves in a spherical shell. Within this set-up, we show new results for the amplitude of the energy stored in zonal flows, angular momentum evolution, and its consequences on tidal dissipation in the envelopes of low-mass stars and giant gaseous planets.

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