Nucleosynthesis in Asymmetric, Core-collapse Supernovae of Massive Stars

We investigate nucleosynthesis in core-collapse supernovae (SNe) of massive stars of 10.8-40M(circle dot), based on 2D hydrodynamic simulations of the SN explosion. We follow long-term evolution of the explosion over 1s after the core bounce, adopting a neutrino-core model, with which we evaluate the evolution of neutrino luminosities and temperatures. We adopt two sets of parameters for the core model; one results in early explosion of 0.2-0.4s after the bounce and the other later explosion of 0.4-0.6s. We then calculate abundance evolution of the SN ejecta through post-processing calculation using a large nuclear reaction network. We find that for both the early and later explosion cases, the explosion energy, E-exp, and ejected masses of Ni-56, Ni-57, and Ti-44 strongly correlate with the compactness parameter at 2.5M(circle dot). Only for the early explosion case, we well reproduce a correlation of the mass of 56Ni to E-exp observed in Type II-Plateau SNe and find two progenitors (similar to 20 and 25M(circle dot)) whose Eexp, and the masses of Ni-56 and Ni-57 are comparable to those in SN1987A.