标题： 供体星再生对共同包层演化的影响 显示英文标题

标题： The Effect of Donor Star Rejuvenation on Common Envelope Evolution

摘要： 在密近双星系统中，可能在之前的质量转移阶段之后发生共同包层演化。 一些孤立形成通道表明，共同包层演化的供体是之前稳定质量转移阶段的吸积体。 吸积应该显著改变供体的结构，特别是通过加深核心-包层界面处的密度梯度并使恒星恢复活力。 我们研究了一个供体的共同包层演化，该供体是之前稳定质量转移阶段的吸积体，并具有恢复活力的结构。 我们使用恢复活力和未恢复活力的一维恒星模型对一个18$M_\odot$超巨星和一个1.4$M_\odot$伴星的共同包层演化进行了三维流体动力学模拟。 我们比较了这两种模拟，以描述恢复活力对共同包层阶段结果和抛射物形状的影响。 我们发现，考虑到之前的质量转移阶段会将螺旋进阶段的持续时间减少两倍，这可能是由于供体外层结构的不同。 在恢复活力的情况下，模拟显示抛射物更集中在赤道且不对称，尽管两种情况都显示出形成压力支持的厚环双星盘的证据。 在动态螺旋进阶段，恢复活力对包层解离的影响尚不明确；我们发现恢复活力会减少未束缚质量的量，根据所使用的能量准则不同，减少量为20$\%$到40$\%$。 显示英文摘要

摘要： In close binary star systems, common envelope evolution may occur after a previous phase of mass transfer. Some isolated formation channels for double neutron star binaries suggest that the donor of common envelope evolution was the accretor of a previous phase of stable mass transfer. Accretion should substantially alter the structure of the donor, particularly by steepening the density gradient at the core-envelope interface and rejuvenating the star. We study the common envelope evolution of a donor that was the accretor of a previous phase of stable mass transfer and has a rejuvenated structure. We perform 3D hydrodynamics simulations of the common envelope evolution of a 18 $M_\odot$ supergiant with a 1.4 $M_\odot$ companion using rejuvenated and non-rejuvenated 1D stellar models for the donor. We compare the two simulations to characterize the effect of the rejuvenation on the outcome of the common envelope phase and the shape of the ejecta. We find that accounting for a previous phase of mass transfer reduces the duration of the inspiral phase by a factor of two, likely due to the different structure in the outer layers of the donor. In the rejuvenated case, the simulations show more equatorially concentrated and asymmetric ejecta, though both cases display evidence for the formation of a pressure-supported thick circumbinary disk. During the dynamical inspiral phase, the impact of rejuvenation on the unbinding of the envelope is unclear; we find that rejuvenation decreases the amount of unbound mass by 20$\%$ to 40$\%$ depending on the energy criterion used.