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arXiv 1509.01280astro-ph.SR
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流体力学中的Kozai-Lidov机制III。圆盘质量和自引力的影响

The Kozai-Lidov Mechanism in Hydrodynamical Disks. III. Effects of Disk Mass and Self-Gravity

Wen Fu, Stephen H. Lubow, Rebecca G. Martin

摘要:

以前,我们表明,一个基本上错位的粘性吸积盘的压力,轨道周围的一个组成部分的一个二元系统可以进行全球阻尼Kozai-Lidov(KL)振荡。这些振荡产生盘偏心率与倾角的周期性交换。盘KL机制是相当鲁棒的,并且在宽范围的二进制和盘参数上操作。然而,自引力的影响,这是预期抑制KL振荡足够大的磁盘,被忽略了。在这里,我们通过流体动力学模拟分析了磁盘自重的影响,并将结果与分析理论的预期进行了比较。在模拟中,抑制所需的盘质量是中心恒星质量的百分之几,这与分析估计大致一致。模拟中抑制KL振荡的条件接近于要求圆盘重力不稳定。我们讨论了我们的结果的动力学的原行星盘和相关的行星形成的一些影响。

英文摘要:

Previously we showed that a substantially misaligned viscous accretion disk with pressure that orbits around one component of a binary system can undergo global damped Kozai-Lidov (KL) oscillations. These oscillations produce periodic exchanges of the disk eccentricity with inclination. The disk KL mechanism is quite robust and operates over a wide range of binary and disk parameters. However, the effects of self-gravity, which are expected to suppress the KL oscillations for sufficiently massive disks, were ignored. Here, we analyze the effects of disk self-gravity by means of hydrodynamic simulations and compare the results with the expectations of analytic theory. The disk mass required for suppression in the simulations is a few percent of the mass of the central star and this roughly agrees with an analytical estimate. The conditions for suppression of the KL oscillations in the simulations are close to requiring that the disk be gravitationally unstable. We discuss some implications of our results for the dynamics of protoplanetary disks and the related planet formation.

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