Nucleosynthesis in the Innermost Ejecta of Neutrino-Drive Supernova Explosions in Two Dimensions

Abstract

We examine the nucleosynthesis in the innermost, neutrino-processed ejecta (a few $10^{-3}{M}_{\odot }$) of self-consistent, two-dimensional explosion models of core-collapse supernovae for six progenitor stars with different initial masses. Three models have initial masses near the low-mass end of the supernova range, $8.8M_{\odot }$ (e8.8; electron-capture supernova), $9.6M_{\odot }$ (z9.6), and $8.1M_{\odot }$ (u8.1), with initial metallicities of 1, 0, and $10^{-4}$ times the solar metallicity, respectively. The other three are solar-metallicity models with initial masses of $11.2M_{\odot }$ (s11), $15M_{\odot }$ (s15), and $27M_{\odot }$ (s27). The low-mass models e8.8, z9.6, and u8.1 exhibit high production factors (nucleosynthetic abundances relative to the solar ones) of 100--200 for light trans-iron elements from Zn to Zr. This is associated with appreciable ejection of neutron-rich matter in these models. Remarkably, the nucleosynthetic outcomes for progenitors e8.8 and z9.6 are almost identical, including interesting productions of ${}^{48}$Ca and ${}^{60}$Fe, irrespective of their quite different (O-Ne-Mg and Fe) cores prior to collapse. In the more massive models s11, s15, and s27, several proton-rich isotopes of light trans-iron elements, including the $p$-isotope ${}^{92}$Mo (for s27) are made, up to production factors of $\sim$30. Both electron-capture and core-collapse supernovae near the low-mass end can therefore be dominant contributors to the Galactic inventory of light trans-iron elements from Zn to Zr and probably ${}^{48}$Ca and live ${}^{60}$Fe. The innermost ejecta of more massive supernovae may have only sub-dominant contributions to the chemical enrichment of the Galaxy except for ${}^{92}$Mo.

25 pages, 15 figures, accepted by ApJ

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