论文标题
大型恒星的共同环境阶段的两阶段形式主义
A two-stage formalism for common-envelope phases of massive stars
论文作者
论文摘要
我们提出了一种新的简单形式主义，以预测带有大量恒星捐助者的普通层阶段后的轨道分离。我们专注于这样一个事实，即巨大的红色超级巨人倾向于在密集的氦芯和对流包膜之间具有相当大的辐射层。我们的形式主义分为两个阶段将共同的阶段对待：通过对流外络的动力学内刺激和从辐射互壳中的热时间尺度传递。通过对参数的基准选择，新的形式主义通常可以预测与经典能量形式主义相比，相比之下。此外，我们的形式主义预测，最终分离在很大程度上取决于供体进化阶段和伴侣质量。我们的形式主义为人群合成研究提供了一种物理动机的替代选择，以治疗共同启动的进化。这种治疗方法将影响大型明星二进制文件的预测，包括重力波源，X射线二进制文件和剥离的envelope Supernovae。
We propose a new simple formalism to predict the orbital separations after common-envelope phases with massive star donors. We focus on the fact that massive red supergiants tend to have a sizeable radiative layer between the dense helium core and the convective envelope. Our formalism treats the common-envelope phase in two stages: dynamical in-spiral through the outer convective envelope and thermal timescale mass transfer from the radiative intershell. With fiducial choices of parameters, the new formalism typically predicts much wider separations compared to the classical energy formalism. Moreover, our formalism predicts that final separations strongly depend on the donor evolutionary stage and companion mass. Our formalism provides a physically-motivated alternative option for population synthesis studies to treat common-envelope evolution. This treatment will impact on predictions for massive-star binaries, including gravitational-wave sources, X-ray binaries and stripped-envelope supernovae.
