Aspherical Properties of Hydrodynamics and Nucleosynthesis in Jet-induced Supernovae

Jet-induced supernovae (SNe) have been suggested to occur in gamma-ray bursts (GRBs) and highly-energetic SNe (hypernovae). I investigate hydrodynamical and nucleosynthetic properties of the jet-induced explosion of a population III 40M⊙ 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 Ėdep = 120 × 10ergs s and 1.5× 10ergs s. I also find that the peculiar abundance pattern of a Si-deficient metal-poor star HE 1424–0241 can be reproduced by the angle-delimited yield for θ = 30−35 of the model with the energy deposition rate of Ėdep = 120×10 51 ergs s. The ejection of Fe-peak products and the fallback of unprocessed materials can account for the abundance patterns of the extremely metal-poor (EMP) stars. 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 model is almost equivalent to the “mixing-fallback” in spherical explosions. In contrast to the spherical models, however, the high-entropy environment realized in the jet-induced explosion enhances [(Sc, Ti, V, Cr, Co, Zn)/Fe]. The enhancements of [Sc/Fe] and [Ti/Fe] improve agreements with the abundance pattern of the EMP stars. Subject headings: Galaxy: halo — gamma rays: bursts — nuclear reactions, nucleosynthesis, abundances — stars: abundances — stars: Population II — supernovae: general