论文标题
积聚二进制的平衡偏心率
Equilibrium eccentricity of accreting binaries
论文作者
论文摘要
使用高分辨率的流体动力学模拟，我们表明，从电路磁盘从$ e \ simeq 0.45 $的轨道偏心演变中积聚的相等质量二进制物，除非它们是在$ e \ syssim 0.08 $的近乎圆形轨道上初始化的，否则它们会进一步圆形。隐含的双模式偏心率分布类似于AGB后恒星二进制中看到的。围绕佩里亚普（Periapse）围绕着大型积聚，在怪异的二进制文件的光曲线上散发出一个讲述的，准周期性的爆发签名。我们预测，输入\ emph {lisa}频段的中间质量和大型黑洞二进制文件将在$ e \ e \ simeq 10^{ - 3} -10^{ - 2} $的范围内具有可测量的偏心率，如果他们经历了燃气驱动的相位。另一方面，GW190521如果通过气盘将其驱动到重力波式示例中，则使用无法检测到的偏心度$ \ sim 10^{ - 6} $进入Ligo/Wigo带。
Using high-resolution hydrodynamics simulations, we show that equal-mass binaries accreting from a circumbinary disk evolve toward an orbital eccentricity of $e \simeq 0.45$, unless they are initialized on a nearly circular orbit with $e \lesssim 0.08$, in which case they further circularize. The implied bi-modal eccentricity distribution resembles that seen in post-AGB stellar binaries. Large accretion spikes around periapse impart a tell-tale, quasi-periodic, bursty signature on the light curves of eccentric binaries. We predict that intermediate-mass and massive black hole binaries at $z \lesssim 10$ entering the \emph{LISA} band will have measurable eccentricities in the range $e \simeq 10^{-3} - 10^{-2}$, if they have experienced a gas-driven phase. On the other hand, GW190521 would have entered the LIGO/Virgo band with undetectable eccentricity $\sim 10^{-6}$ if it had been driven into the gravitational wave regime by a gas disk.
