向IIb型超新星祖先的偏心掠食包层演化
Eccentric grazing envelope evolution towards type IIb supernova progenitors
摘要：
我们模拟的框架下的掠包络演化（GEE）通道的形成IIb型超新星（SNe IIb）的偏心双星系统的演化，并发现，额外的质量去除喷流增加的参数空间在这个通道中形成的SNe IIb。为了探索偏心率的作用和额外的质量去除喷流，我们使用恒星演化代码MESA二进制。初始的一次和二次质量分别为M1 i = 15 Mo和M2 i =2.5Mo。我们研究了初始半长轴为600- 1000 Ro，偏心率为e=0-0.9。洛希瓣溢出（RLOF）和喷流的质量移除，以及随后的风，都在M（H，f）= 0.05 Mo的爆炸恒星中留下氢质量，与SN IIb的祖先相容。当初始轨道不是圆形时，最终轨道可能有很高的偏心率。在许多情况下，无论有无射流的额外质量去除，系统都可以进入共同包络演化（CEE）阶段，然后从该阶段出来。在某些偏心率范围内，射流更有效地防止CEE。尽管有很大的不确定性，额外的质量去除喷流大大增加了系统的可能性，从CEE。这加强了早先关于圆形轨道的结论。在某些情况下，单独的RLOF，没有通过射流去除质量，可以形成SN IIb祖细胞。我们估计，额外的质量去除GEE通道中的喷气机增加祖细胞的数量相对于单独的RLOF约2倍。
英文摘要：
We simulate the evolution of eccentric binary systems in the frame of the grazing envelope evolution (GEE) channel for the formation of Type IIb supernovae (SNe IIb), and find that extra mass removal by jets increases the parameter space for the formation of SNe IIb in this channel. To explore the role of eccentricity and the extra mass removal by jets we use the stellar evolutionary code MESA binary. The initial primary and secondary masses are M1i=15Mo and M2i=2.5Mo. We examine initial semi-major axes of 600-1000Ro, and eccentricities of e=0-0.9. Both Roche lobe overflow (RLOF) and mass removal by jets, followed by a wind, leave a hydrogen mass in the exploding star of M(H,f)=0.05Mo, compatible with a SN IIb progenitor. When the initial orbit is not circular the final orbit might have a very high eccentricity. In many cases, with and without the extra mass removal by jets, the system can enter a common envelope evolution (CEE) phase, and then gets out from it. For some ranges of eccentricities the jets are more efficient in preventing the CEE. Despite the large uncertainties, extra mass removal by jets substantially increases the likelihood of the system to get out from a CEE. This strengthens earlier conclusions for circular orbits. In some cases RLOF alone, without mass removal by jets, can form SN IIb progenitors. We estimate that the extra mass removal by jets in the GEE channel increases the number of progenitors relative to that by RLOF alone by about a factor of two.
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