Jets in Common Envelopes: A low mass main sequence star in a red giant
Jets in Common Envelopes: A low mass main sequence star in a red giant
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共同包层中的喷流：红巨星中的低质量主序星
DOI：
10.1093/mnras/stac932
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发表时间：
2021
影响因子：
4.8
通讯作者：
R. Iaconi
中科院分区：
文献类型：
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作者：
D. López;F. De Colle;E. Mendez;Sagiv Shiber;R. Iaconi
我们给出了0.3M⊙主序星在0.88M⊙红巨星包层内发射两个垂直喷流的小尺度三维流体动力学模拟。基于之前的大规模模拟，我们研究了副星掠过、俯冲或完好地在红巨星的包层内(在∼11天的每个阶段)时喷流的动力学。喷流通过公共包络(CE)的动力学取决于环境条件以及它们的动力。在放牧阶段和俯冲开始阶段，自主调节射流需要更高的效率才能突破RG的包络。在行政长官内部，在模拟的时间尺度上，喷气式飞机被扼杀，无论它们是自我调节还是持续提供动力。能够在大规模模拟中突破RG的包络的喷气式飞机，在我们的小规模模拟中被扼杀。附加到第二颗恒星上的角动量还不够大，不足以形成圆盘。MS恒星上的质量吸积是邦迪-霍伊尔-利特尔顿速率(∼10−3-10−1 M⊙−1)的1-10%。如果喷流离开CE，预计会有从X射线到紫外线和光学的高光度发射。我们的模拟说明了在CES的动力学演化中包含更真实的吸积和喷流模型的必要性。
We present small-scale three-dimensional hydrodynamical simulations of the evolution of a 0.3 M⊙ main sequence star which launches two perpendicular jets within the envelope of a 0.88 M⊙ red giant. Based on previous large-scale simulations, we study the dynamics of the jets either when the secondary star is grazing, when it has plunged-in, or when it is well-within the envelope of the red giant (in each stage for ∼11 days). The dynamics of the jets through the common envelope (CE) depend on the conditions of the environment as well as on their powering. In the grazing stage and the commencement of the plunge self-regulated jets need higher efficiencies to break out of the envelope of the RG. Deep inside the CE, on the timescales simulated, jets are choked independently of whether they are self-regulated or constantly powered. Jets able to break out of the envelope of the RG in large-scale simulations, are choked in our small-scale simulations. The accreted angular momentum on to the secondary star is not large enough to form a disk. The mass accretion on to the MS star is 1-10 per cent of the Bondi-Hoyle-Littleton rate (∼10−3–10−1 M⊙ yr−1). High luminosity emission, from X-rays to UV and optical, is expected if the jets break out of the CE. Our simulations illustrate the need for inclusion of more realistic accretion and jet models in the dynamical evolution of the CEs.