论文标题
与恒星质量黑洞二进制的星星的紧密相遇
Close Encounters of Stars with Stellar-mass Black Hole Binaries
论文作者
论文摘要
许多天体物理环境，从星形簇和球状簇到活跃银河核的磁盘，都以恒星和它们留下的紧凑物体之间的频繁相互作用来表征。在这里，使用$ 3-D $流体动力学模拟的套件，我们探索了重力波状态中100万美元_ {\ odot} $星际与二进制黑洞（BBH）之间紧密相互作用的结果BH有效自旋。我们发现TDE可以对二进制轨道产生重大影响，这通常与纯散射不同。经历了前进（逆行）TDE的二进制文件往往会扩大（硬化）高达$ \ simeq 20 \％$。最初，圆形二进制文件变得更加偏心，而$ \ lyssim 10 \％$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ tde的偏心偏心的偏心率通过逆行（Prograde）TDE增加（减少）tde tde tde bials $ \ sillsim 5 \％。总体而言，单个TDE通常可以通过订单统一导致重力波驱动的合并时间尺度的变化。两个黑洞的积聚率都是非常高的超级埃德丁顿，在轨道时期的时间尺度上显示了调制（优先用于逆行TDE），这可能是BBH驱动的TDE的特征。 Prograde TDES导致有效的自旋参数$χ$变化为$ \ lyssim 0.02 $，而逆行TDE的$χ\ gtrsim -0.005 $。
Many astrophysical environments, from star clusters and globular clusters to the disks of Active Galactic Nuclei, are characterized by frequent interactions between stars and the compact objects that they leave behind. Here, using a suite of $3-D$ hydrodynamics simulations, we explore the outcome of close interactions between $1M_{\odot}$ stars and binary black holes (BBHs) in the gravitational wave regime, resulting in a tidal disruption event (TDE) or a pure scattering, focusing on the accretion rates, the back reaction on the BH binary orbital parameters and the increase in the binary BH effective spin. We find that TDEs can make a significant impact on the binary orbit, which is often different from that of pure scattering. Binaries experiencing a prograde (retrograde) TDE tend to be widened (hardened) by up to $\simeq 20\%$. Initially circular binaries become more eccentric by $\lesssim 10\%$ by a prograde or retrograde TDE, whereas the eccentricity of initially eccentric binaries increases (decreases) by a retrograde (prograde) TDE by $\lesssim 5\%$. Overall a single TDE can generally result in changes of the gravitational wave-driven merger time scale by order unity. The accretion rates of both black holes are very highly super-Eddington, showing modulations (preferentially for retrograde TDEs) on a time scale of the orbital period, which can be a characteristic feature of BBH-driven TDEs. Prograde TDEs result in the effective spin parameter $χ$ to vary by $\lesssim 0.02$ while $χ\gtrsim -0.005$ for retrograde TDEs.
