论文标题
重新审视共同的包膜演化 - 一种用于N体和种群合成代码的新的半分析模型
Revisiting Common Envelope Evolution -- A New Semi-Analytic Model for N-body and Population Synthesis Codes
论文作者
论文摘要
我们提出了一种建模二进制和少数体系统中常见包膜演化的新方法。我们认为由拖力的驱动力以相对距离和速度依赖的阻力驱动。轨道运动是通过直接N体积分或使用扰动理论得出的轨道元素的一组微分方程来解决的。我们的形式主义可以在共同的包膜灵感中对偏心率进行建模，并给出与平滑颗粒流体动力学模拟一致的结果。我们将形式主义应用于二元人口综合模型的常见包络事件，发现最终的偏心分布与观察到的后共元二进制文件的分布相似。我们的模型可用于人口综合计算中的时间分辨共同层次的演变，也可以作为恒星簇直接N体仿真中的二元相互作用的一部分。
We present a novel way of modeling common envelope evolution in binary and few-body systems. We consider the common envelope inspiral as driven by a drag force with a power-law dependence in relative distance and velocity. The orbital motion is resolved either by direct N-body integration or by solving the set of differential equations for the orbital elements as derived using perturbation theory. Our formalism can model the eccentricity during the common envelope inspiral, and it gives results consistent with smoothed particles hydrodynamical simulations. We apply our formalism to common envelope events from binary population synthesis models and find that the final eccentricity distribution resembles the observed distribution of post-common-envelope binaries. Our model can be used for time-resolved common-envelope evolution in population synthesis calculations or as part of binary interactions in direct N-body simulations of star clusters.
