Aspherical properties of hydrodynamics and nucleosynthesis in jet-induced supernovae

Abstract

Jet-induced supernovae (SNe) have been suggested to occur in gamma-ray bursts and highly-energetic SNe (hypernovae). I investigate hydrodynamical and nucleosynthetic properties of the jet-induced explosion of a population III 40 M star with a two-dimensional special relativistic hydrodynamical code. The abundance distribution after the explosion and the angular dependence of the yield are obtained for the models with high and low energy deposition rates erg s-1 and 1.5 × 1051 erg s-1, respectively. The ejection of Fe-peak products and the fallback of unprocessed materials in the jet-induced SNe account for the abundance patterns of the extremely metal-poor stars. It is also found that the peculiar abundance pattern of a Si-deficient metal-poor star HE 1424-0241 is reproduced by the angle-delimited yield for θ = 30°-35° of the model with erg s -1. Furthermore, I compare the yield of the jet-induced explosion with that of the spherical explosion and confirm the ejection and fallback in the jet-induced explosion is almost equivalent to the "mixing- fallback" in spherical explosions. In contrast to the spherical models, however, the high-entropy environment is realized in the jet-induced explosion and thus [(Sc, Ti, V, Cr, Co, Zn)/Fe] are enhanced. The enhancements of [Sc/Fe] and [Ti/Fe] improve agreements with the abundance patterns of the extremely metal-poor stars. © 2009. The American Astronomical Society. All rights reserved.