论文标题
脱落的磁盘的快速增长的倾斜不稳定
A fast-growing tilt instability of detached circumplanetary disks
论文作者
论文摘要
二元系统中的积聚磁盘可能表现出倾斜的不稳定性，这是由于潮汐电势和耗散之间的相互作用而产生的。使用线性分析，我们表明，圆盘的长宽比和外部半径为倾斜生长提供了有利的条件。我们使用基于粒子的（\ sc Phantom}）和基于网格的（{\ sc achena ++}）水力动力模拟来量化不稳定性的生长速率。对于具有外纵横比$ h/r \ simeq 0.1 $的磁盘，最初在约15-30个二进制轨道的时间范围内进行中等倾斜度。我们的结果表明，脱离的圆盘磁盘的进化并非完全由折内磁盘的积聚控制，通常可能将其与行星轨道平面失去原状。我们讨论对行星旋转进化的含义，以及倾斜不稳定性与Kozai-Lidov动力学之间的可能相互作用。
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.
