Nucleosynthesis of an $11.8M_{\odot }$ Supernova with 3D Simulation of the Inner Ejecta: Overall Yields and Implications for Short-Lived Radionuclides in the Early Solar System

Abstract

Based on a 3D supernova simulation of an $11.8M_{\odot }$ progenitor model with initial solar composition, we study the nucleosynthesis using tracers covering the innermost $0.1M_{\odot }$ of the ejecta. These ejecta are mostly proton-rich and contribute significant amounts of ${}^{45}$Sc and ${}^{64}$Zn. The production of heavier isotopes is sensitive to the electron fraction and hence the neutrino emission from the proto-neutron star. The yields of these isotopes are rather uncertain due to the approximate neutrino transport used in the simulation. In order to obtain the total yields for the whole supernova, we combine the results from the tracers with those for the outer layers from a suitable 1D model. Using the yields of short-lived radionuclides (SLRs), we explore the possibility that an $11.8M_{\odot }$ supernova might have triggered the formation of the solar system and provided some of the SLRs measured in meteorites. In particular, we discuss two new scenarios that can account for at least the data on ${}^{41}$Ca, ${}^{53}$Mn, and ${}^{60}$Fe without exceeding those on the other SLRs.

16 pages, 9 Figures, 4 Tables

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