Tidal Disruption Events by Compact Supermassive Black Hole Binaries
Tidal Disruption Events by Compact Supermassive Black Hole Binaries
复制标题
致密超大质量黑洞双星的潮汐破坏事件
DOI：
10.1093/mnras/stac1987
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
N.W.C.Leigh
中科院分区：
文献类型：
--
作者：
T.Ryu ;A.A.Trani;N.W.C.Leigh
恒星可以被超大质量黑洞双星（SMBHB）潮汐摧毁或吞噬。使用大量的少体模拟，我们研究了具有宽范围关键参数的硬SMBHB对完全和部分破裂以及直接捕获事件的增强和抑制，这些参数包括初级BH质量（），二元质量比（10−3-1），二元半长轴与硬化半径的比值（10−4-1），双星偏心率（0.0-0.9）和恒星质量。这是一个显着的扩展参数空间相比，以前的工作。我们发现，所有三个事件的遭遇概率很好地描述了遭遇横截面。由SMBHB的完全潮汐中断事件（FTDEs）的概率可以提高高达40-50倍或抑制高达10倍，相对于由单个BH，取决于二进制参数。相对论效应可以提供一个额外的增强的FTDE概率小于2-3的因素。我们提供了一个拟合公式的FTDE概率SMBHB的工程参数范围很广。部分中断事件可能在FTDE或直接捕获之前多次发生，其概率可能比FTDE大三倍。由于部分破裂事件会引起恒星自旋和质量损失，并改变轨道，因此它会显著影响整体FTDE率和光变曲线的形状。
Stars can be tidally destroyed or swallowed by supermassive black hole binaries (SMBHBs). Using a large number of few-body simulations, we investigate the enhancement and suppression of full and partial disruption and direct capture events by hard SMBHBs with wide ranges of key parameters, i.e. the primary BH mass (), the binary mass ratio (10−3–1), the ratio of the binary semimajor axis to the hardening radius (10−4–1), the binary eccentricity (0.0–0.9) and the stellar mass. This is a significant extension of the parameter space compared to previous work. We show that the encounter probabilities of all three events are well-described by the encounter cross-section. The probability of full tidal disruption events (FTDEs) by SMBHBs can be enhanced by up to a factor of 40–50 or suppressed by up to a factor of 10, relative to that by single BHs, depending on the binary parameters. Relativistic effects can provide an additional enhancement of the FTDE probability by less than a factor of 2–3 for. We provide a fitting formula for the FTDE probability by SMBHBs that works for a wide range of parameters. Partial disruption events can occur multiple times before FTDEs or direct captures, and their probabilities can be greater than that of FTDEs by a factor of three. Because partial disruption events can induce stellar spins and mass loss, and change the orbits, it can significantly affect the overall FTDE rate and the shape of the light curves.