Jets from main sequence and white dwarf companions during common envelope evolution
Jets from main sequence and white dwarf companions during common envelope evolution
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共同包层演化过程中来自主序带和白矮星伴星的喷流
DOI：
10.1093/mnras/stac1529
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发表时间：
2022
影响因子：
4.8
通讯作者：
Frank, Adam
中科院分区：
文献类型：
--
作者：
Zou, Yangyuxin;Chamandy, Luke;Carroll-Nellenback, Jonathan;Blackman, Eric G.;Frank, Adam
长期以来，人们一直推测，在一个共同的包层（CE）事件中，从吸积到伴星的喷流反馈可能会影响轨道演化和包层解绑过程。我们提出了全球3D流体动力学模拟CE演变（CEE），包括一个射流亚网格模型，并将它们与其他相同的模型没有射流。我们的双星由一个2-M的红巨星分支主星和一个1-或0.5-M的主星序（MS）或白色矮星（WD）的次级伴星组成。我们运行模拟10个轨道（40 d）。我们的喷流模型以爱丁顿速率的数量级的恒定速率增加质量，最大速度vj的逃逸速度的数量级，两个球形扇区的喷流轴垂直于轨道平面。我们探讨的影响，喷气轨道演化，信封形态和信封解绑，并评估的依赖关系的喷气质量损失率，发射速度，同伴质量，开角，吸积率的结果。根据我们的理论估计，喷流在第一次近星点通过时被阻塞，此后一直被阻塞。在阻塞之后，但不是在阻塞之前，射流有效地将能量传递到结合的封套材料。与没有射流的模拟相比，这导致未结合质量增加高达。我们还估计了一个完整的CE阶段的喷气机的累积效应，发现MS和WD同伴发射的喷气机不太可能主导包络线解绑。
It has long been speculated that jet feedback from accretion on to the companion during a common envelope (CE) event could affect the orbital evolution and envelope unbinding process. We present global 3D hydrodynamical simulations of CE evolution (CEE) that include a jet subgrid model and compare them with an otherwise identical model without a jet. Our binary consists of a 2-M⊙red giant branch primary and a 1- or 0.5-M⊙main sequence (MS) or white dwarf (WD) secondary companion modelled as a point particle. We run the simulations for 10 orbits (40 d). Our jet model adds mass at a constant rateof the order of the Eddington rate, with maximum velocityvjof the order of the escape speed, to two spherical sectors with the jet axis perpendicular to the orbital plane. We explore the influence of the jet on orbital evolution, envelope morphology and envelope unbinding, and assess the dependence of the results on the jet mass-loss rate, launch speed, companion mass, opening angle, and accretion rate. In line with our theoretical estimates, jets are choked around the time of first periastron passage and remain choked thereafter. Subsequent to choking, but not before, jets efficiently transfer energy to bound envelope material. This leads to increases in unbound mass of up to, as compared to the simulations without jets. We also estimate the cumulative effects of jets over a full CE phase, finding that jets launched by MS and WD companions are unlikely to dominate envelope unbinding.