Binary population synthesis models for core-collapse gamma-ray burst progenitors
Binary population synthesis models for core-collapse gamma-ray burst progenitors
复制标题
DOI：
10.1093/mnras/stz3246
复制
发表时间：
2019-11
影响因子：
4.8
通讯作者：
A. Chrimes;E. Stanway;J. Eldridge
中科院分区：
文献类型：
--
作者：
A. Chrimes;E. Stanway;J. Eldridge
长时间的伽马射线暴（grb）被认为是大质量、被剥离的包膜、快速旋转的恒星子集的最终命运。除此之外，我们对祖先系统的了解是有限的。利用双星人口和光谱合成（bpass）恒星演化模型，我们研究了双星中的一些大质量恒星可以保持产生喷流所需的角动量，同时仍然通过风或双星相互作用失去其外层包层的可能性。我们发现，总氢质量MH < 5 × 10−4 M⊙和氦喷射质量分数FHe < 0.20分别为II/Ibc和Ib/Ic型超新星划分提供了最佳阈值。双星中的潮汐相互作用通过应用潮汐算法对bpass输出的恒星演化模型进行后处理来解释。我们表明，观测到的体积伽马射线暴速率演化可以通过两种不同的路径和似是而非的爆发参数分布来重现。在第一种路径中，恒星被质量吸积旋转成一种准均匀状态。在第二种情况下，潮汐维持着恒星的旋转，否则恒星就会自旋而下。两者都导致了Ic型超新星祖先，并且金属丰度分布与GRB宿主星系种群一致。根据我们模型中所做的假设，推断出的射流产生的核心角动量阈值与坍缩的理论要求是一致的。因此，我们可以同时再现核心坍缩超新星/GRB观测和理论的几个方面。我们讨论了预测的GRB祖星系及其幸存同伴的可观测性质。
Long-duration gamma-ray bursts (GRBs) are understood to be the final fate for a subset of massive, stripped envelope, rapidly rotating stars. Beyond this, our knowledge of the progenitor systems is limited. Using the Binary Population and Spectral Synthesis (bpass) stellar evolution models, we investigate the possibility that some massive stars in binaries can maintain the angular momentum required for jet production, while still loosing their outer envelope through winds or binary interactions. We find that a total hydrogen mass of MH < 5 × 10−4 M⊙ and a helium ejecta mass fraction of FHe < 0.20 provide the best thresholds for the supernova type II/Ibc and Ib/Ic divisions, respectively. Tidal interactions in binaries are accounted for by applying a tidal algorithm to post-process the stellar evolution models output by bpass. We show that the observed volumetric GRB rate evolution can be recreated using two distinct pathways and plausible distributions for burst parameters. In the first pathway, stars are spun up by mass accretion into a quasi-homogeneous state. In the second, tides maintain rotation where otherwise the star would spin-down. Both lead to type Ic supernova progenitors, and a metallicity distribution consistent with the GRB host galaxy population. The inferred core angular momentum threshold for jet production is consistent with theoretical requirements for collapsars, given the assumptions made in our model. We can therefore reproduce several aspects of core-collapse supernova/GRB observation and theory simultaneously. We discuss the predicted observable properties of GRB progenitors and their surviving companions.