脱离的环行星盘的快速增长的倾斜不稳定性
A fast-growing tilt instability of detached circumplanetary disks
摘要：
双星系统中的吸积盘会表现出倾斜不稳定性，这种不稳定性是由潮汐位和耗散之间的相互作用引起的。使用线性分析，我们表明，纵横比和外半径的环行星盘倾斜生长提供了有利的条件。我们使用基于粒子（{ \sc phantom}）和基于网格（{ \sc athena++}）的流体动力学模拟来量化不稳定性的增长率。对于一个外宽比为$H/r \simeq 0.1$的盘，在大约15-30个双星轨道的时间尺度上，最初的中等倾斜会加倍。我们的研究结果意味着，分离的环行星盘，其演变并不完全控制的吸积从拱星盘，通常可能是不对准的行星轨道平面。我们讨论了行星自旋演化的影响，以及倾斜不稳定性和Kozai-Lidov动力学之间可能的相互作用。
英文摘要：
Accretion disks in binary systems can exhibit a tilt instability, arising from the interaction between components of the tidal potential and dissipation. Using a linear analysis, we show that the aspect ratios and outer radii of circumplanetary disks provide favorable conditions for tilt growth. We quantify the growth rate of the instability using particle-based ({\sc phantom}) and grid-based ({\sc athena++}) hydrodynamic simulations. For a disk with outer aspect ratio $H/r \simeq 0.1$, initially moderate tilts double on a time scale of about 15-30 binary orbits. Our results imply that detached circumplanetary disks, whose evolution is not entirely controlled by accretion from the circumstellar disk, may commonly be misaligned to the planetary orbital plane. We discuss implications for planetary spin evolution, and possible interactions between the tilt instability and Kozai-Lidov dynamics.
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