English

Impact of hypernova {\nu}p-process nucleosynthesis on the galactic chemical evolution of Mo and Ru

Astrophysics of Galaxies 2022-01-19 v3 High Energy Astrophysical Phenomena Solar and Stellar Astrophysics

Abstract

We calculate Galactic Chemical Evolution (GCE) of Mo and Ru by taking into account the contribution from νp\nu p-process nucleosynthesis. We estimate yields of pp-nuclei such as 92,94Mo^{92,94}\mathrm{Mo} and 96,98Ru^{96,98}\mathrm{Ru} through the νp\nu p-process in various supernova (SN) progenitors based upon recent models. In particular, the νp\nu p-process in energetic hypernovae produces a large amount of pp-nuclei compared to the yield in ordinary core-collapse SNe. Because of this the abundances of 92,94Mo^{92,94}\mathrm{Mo} and 96,98Ru^{96,98}\mathrm{Ru} in the Galaxy are significantly enhanced at [Fe/H]=0 by the νp\nu p-process. We find that the νp\nu p-process in hypernovae is the main contributor to the elemental abundance of 92^{92}Mo at low metallicity [Fe/H]<2]<-2. Our theoretical prediction of the elemental abundances in metal-poor stars becomes more consistent with observational data when the νp\nu p-process in hypernovae is taken into account.

Keywords

Cite

@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