Nucleosynthesis in a neutrino-driven supernova explosion of first stars

Abstract

We examine explosive nucleosynthesis during neutrino-driven, aspherical supernovae (SNe) of Population (Pop) III stars, based on two-dimensional (2D) hydrodynamic simulations of the explosion of 11-40M⊙ Pop III stars. The magnitude and asymmetry of the explosion energy are estimated with the simulations. By post-processing calculations with a large nuclear reaction network, we have evaluated abundances and masses of ejecta from the aspherical SNe. We find that the evaluated abundance patterns are similar to those observed in extremely metal poor stars, as shown in spherical and 2D models, in which the explosion is manually and spherically initiated. Faint SNe of 11 and 15M⊙ progenitors show large [C/Fe] > 0.7, as observed in C-enhanced metalpoor stars. Moreover, observed increasing trend of [C/O] towards for lower [O/H] could rely on a fact that [C/O] increases and [O/H] decreases for a progenitor with a lower mass.