Impact of Hypernova νp-process Nucleosynthesis on the Galactic Chemical Evolution of Mo and Ru

Abstract

We calculate the Galactic Chemical Evolution of Mo and Ru by taking into account the contribution from ν p -process nucleosynthesis. We estimate yields of p -nuclei such as 92,94 Mo and 96,98 Ru through the ν p -process in various supernova progenitors based upon recent models. In particular, the ν p -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 92,94 Mo and 96,98 Ru in the Galaxy are significantly enhanced at [Fe/H] = 0 by the ν p -process. We find that the ν p -process in hypernovae is the main contributor to the elemental abundance of 92 Mo 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 ν p -process in hypernovae is taken into account.