General relativistic effects on neutrino-driven winds from young, hot neutron stars and r-process nucleosynthesis

被引:197
作者
Otsuki, K [1 ]
Tagoshi, H
Kajino, T
Wanajo, SY
机构
[1] Natl Astron Observ, Div Theoret Astrophys, Mitaka, Tokyo 1818588, Japan
[2] Osaka Univ, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan
关键词
nuclear reactions; nucleosynthesis; abundances; relativity; stars : neutron; stars; winds; outflows; supernovae : general;
D O I
10.1086/308632
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Neutrino-driven winds from young hot neutron stars, which are formed by supernova explosions, are the most promising candidate site for r-process nucleosynthesis. We study general relativistic effects on this wind in Schwarzschild geometry in order to look for suitable conditions for successful r-process nucleosynthesis. It is quantitatively demonstrated that: general relativistic effects play a significant role in increasing the entropy and decreasing the dynamic timescale of the neutrino-driven wind. Exploring the wide parameter region that determines the expansion dynamics of the wind, we find interesting physical conditions that lead to successful r-process nucleosynthesis. The conditions that we found are realized in a neutrino-driven wind with a very short dynamic timescale, tau(dyn) similar to 6 ms, and a relatively low entropy, S similar to 140. We carry out alpha-process and r-process nucleosynthesis calculations on these conditions with our single network code, which includes over 3000 isotopes, and confirm quantitatively that the second and third r-process abundance peaks are produced in neutrino-driven winds.
引用
收藏
页码:424 / 439
页数:16
相关论文
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