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

• Published in: The Astrophysical journal Vol. 924; no. 1; pp. 29 - 35
• Main Authors: Sasaki, Hirokazu, Yamazaki, Yuta, Kajino, Toshitaka, Kusakabe, Motohiko, Hayakawa, Takehito, Cheoun, Myung-Ki, Ko, Heamin, Mathews, Grant J.
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01.01.2022; IOP Publishing
• Subjects: Abundance; ASTRONOMY AND ASTROPHYSICS; Astrophysics; Chemical evolution; Evolution; Explosive nucleosynthesis; Galactic abundances; Galactic evolution; Galaxies; Galaxy chemical evolution; Hypernovae; Iron; Metallicity; Nuclear fusion; Nuclei; Supernova
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/ac34f8

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.