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

초록

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

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