论文标题
高度偏心盘的动态结构，并应用于潮汐破坏事件
Dynamical structure of highly eccentric discs with applications to tidal disruption events
论文作者
论文摘要
潮汐破坏事件是否直接像高度偏心的光盘一样循环或增生是当前研究的主题，并且似乎敏感地取决于椎间盘热力学。没有得到太多关注的这个问题的一个方面是，高度偏心的光盘必须对每个轨道周围的圆盘尺度高度具有很强的非静态变化。作为对其他组进行的数值模拟的补充，我们使用偏心胶盘的非线性理论研究了TDE盘的动力结构。特别是，我们研究了动态垂直结构以及粘性耗散和辐射冷却，研究每个椭圆轨道周围的物理量的变化。该解决方案包括与模拟中看到的类似喷嘴样结构的结构。我们发现证据表明，在辐射压力主导的高度偏心盘中的热不稳定性存在。对于热稳定溶液，我们的许多模型表明$α-$处方的湍流应力失败。我们讨论了我们结果对偏心TDE盘结构的后果。
Whether tidal disruption events circularise or accrete directly as highly eccentric discs is the subject of current research and appears to depend sensitively on the disc thermodynamics. One aspect of this problem that has not received much attention is that a highly eccentric disc must have a strong, non-hydrostatic variation of the disc scale height around each orbit. As a complement to numerical simulations carried out by other groups, we investigate the dynamical structure of TDE discs using the nonlinear theory of eccentric accretion discs. In particular, we study the variation of physical quantities around each elliptical orbit, taking into account the dynamical vertical structure, as well as viscous dissipation and radiative cooling. The solutions include a structure similar to the nozzle-like structure seen in simulations. We find evidence for the existence of the thermal instability in highly eccentric discs dominated by radiation pressure. For thermally stable solutions many of our models indicate a failure of the $α-$prescription for turbulent stresses. We discuss the consequences of our results for the structure of eccentric TDE discs.
