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Contribution of collapsars, supernovae, and neutron star mergers to the evolution of r-process elements in the Galaxy

We study the evolution of rapid neutron-capture process (r-process) isotopes in the Galaxy. We analyze relative contributions from core collapse supernovae (CCSNe), neutron star mergers (NSMs) and collapsars under a range of astrophysical conditions and nuclear input data. Although the r-process in each of these sites can lead to similar (or differing) isotopic abundances, our simulations reveal that the early contribution of r-process material to the Galaxy was dominated by CCSNe and collapsar r-process nucleosynthesis, while the NSM contribution is unavoidably delayed even under the assumption of the shortest possible minimum merger time.

preprint2021arXivOpen access
Yuta YamazakiToshitaka KajinoGrant J. MathewsXiaodong TangJianrong ShiMichael A. Famiano
astro-ph.GA
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Yuta YamazakiToshitaka KajinoGrant J. MathewsXiaodong TangJianrong ShiMichael A. Famiano

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