Heavy-element Nucleosynthesis inMagnetohydrodynamical Jets from Collapsars

摘要

We investigate the heavy-element nucleosynthesis of a massive star whose mass in the main sequence stage is M_(ms) = 70 M_⊙. Numerical calculations of the nucleosynthesis are performed during the stage of hydrostatic stellar evolution until the core composed of iron-group nuclei begins to collapse. As a supernova explosion model, a collapsar model is constructed whose jets are driven by magnetohydrodynamical effects of a differentially rotating core. The heavy-element nucleosynthesis inside the jet of a collapsar model is followed along the trajectories of stream lines of the jet. We combine the results of both detailed hydrostatic and heavy-element nucleosyntheses to compare with the solar abundances. We find that neutron-rich elements of 70 < A < 160 are highly overproduced to the solar abundances. Therefore, we conclude that this scenario should be rare and elements of A ≤ 70 are compensated for other supernova explosion models.