Nucleosynthesis in Outflows from the Inner Regions of Collapsars
Nucleosynthesis in Outflows from the Inner Regions of Collapsars
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DOI：
10.1086/382036
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发表时间：
2003-09
期刊：
影响因子：
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通讯作者：
J. Pruet;T. Thompson;R. Hoffman
中科院分区：
文献类型：
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作者：
J. Pruet;T. Thompson;R. Hoffman
我们考虑源自旋转大质量恒星坍缩后形成的粘性吸积盘内部区域的流出物中的核合成。我们证明，由粘性和中微子加热驱动的风状外流可以有效地合成以接近相对论速度移动的铁族元素。合成的 56Ni 的质量和我们计算中获得的渐近速度与 SN 1998bw 和 SN 2003dh 的观测推断的一致。这些稳定的风状流出物通常富含质子，其特征是熵适中，因此基本上不会合成比 Fe 族元素更重的元素。我们还讨论了吸积盘附近或吸积盘内局部区域快速能量沉积导致的气泡状流出。这些间歇性喷射物具有低电子分数，是合成 A = 130 r 过程峰元素的有希望的场所。
We consider nucleosynthesis in outflows originating from the inner regions of viscous accretion disks formed after the collapse of a rotating massive star. We show that windlike outflows driven by viscous and neutrino heating can efficiently synthesize Fe group elements moving at near-relativistic velocities. The mass of 56Ni synthesized and the asymptotic velocities attained in our calculations are in accord with those inferred from observations of SN 1998bw and SN 2003dh. These steady windlike outflows are generally proton-rich, characterized by only modest entropies, and consequently synthesize essentially nothing heavier than the Fe group elements. We also discuss bubble-like outflows resulting from rapid energy deposition in localized regions near or in the accretion disk. These intermittent ejecta emerge with low electron fraction and are a promising site for the synthesis of the A = 130 r-process peak elements.