10–13 Aug 2011
AlbaNova University Center
Europe/Stockholm timezone

Explosive nucleosynthesis in neutrino-driven, zero-metal supernovae

10 Aug 2011, 19:20
5m
Oskar Klein (AlbaNova University Center)

Oskar Klein

AlbaNova University Center

Speaker

Dr Shin-ichiro Fujimoto (Kumamoto National College of Technology)

Description

We examine explosive nucleosynthesis during neutrino-driven, aspherical supernova (SN) explosion aided by standing accretion shock instability, based on two-dimensional hydrodynamic simulations of the explosion of 15-40$M_\odot$ stars with zero metallicity. The magnitude and asymmetry of the explosion energy are estimated with the simulations, for a given set of neutrino luminosities and temperatures. 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 (Cayrel et al. 2004, Lai et al. 2008), as shown in the spherical models of Tominaga et al. (2007) and Heger \& Woosley (2008) and in the two-dimensional models of Joggerst et al. (2010), although in their models, the explosion is manually and spherically initiated by means of a thermal bomb or a piston. Sc and Co, which are underproduced in the two-dimensional models of Joggerst et al. (2010), are appropriately produced in our models. Hypernovae may not be required to reproduce the observed abundance patterns. No models in our simulations, however, can reproduce large [C,N,O/Mg] (> 1) observed in two hyper metal-poor stars.

Primary author

Dr Shin-ichiro Fujimoto (Kumamoto National College of Technology)

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