We calculate Galactic Chemical Evolution (GCE) of Mo and Ru by taking into account the contribution from νp-process nucleosynthesis. We estimate yields of p-nuclei such as 92,94Mo and 96,98Ru through the νp-process in various supernova (SN) progenitors based upon recent models. In particular, the νp-process in energetic hypernovae produces a large amount of p-nuclei compared to the yield in ordinary core-collapse SNe. Because of this the abundances of 92,94Mo and 96,98Ru in the Galaxy are significantly enhanced at [Fe/H]=0 by the νp-process. We find that the νp-process in hypernovae is the main contributor to the elemental abundance of 92Mo at low metallicity [Fe/H]<−2. Our theoretical prediction of the elemental abundances in metal-poor stars becomes more consistent with observational data when the νp-process in hypernovae is taken into account.
@article{arxiv.2106.01679,
title = {Impact of hypernova {\nu}p-process nucleosynthesis on the galactic chemical evolution of Mo and Ru},
author = {Hirokazu Sasaki and Yuta Yamazaki and Toshitaka Kajino and Motohiko Kusakabe and Takehito Hayakawa and Myung-Ki Cheoun and Heamin Ko and Grant J. Mathews},
journal= {arXiv preprint arXiv:2106.01679},
year = {2022}
}
Comments
15 pages, 5 figures, accepted for publication in ApJ