Production of 44Ti in neutrino-driven aspherical supernova explosions

We examine the synthesis of 44Ti in a neutrino-driven aspherical supernova (SN), focusing on reaction rates related to 44Ti and rotation of a progenitor. We have performed 2D hydrodynamic simulations of SN of a 15M⊙ progenitor, whose angular velocity is manually set to be a cylindrical distribution and have followed explosive nucleosynthesis in the ejecta. We find that the faster rates of 40Ca(α,γ)44Ti and the slower rate of 44Ti(α,p)47V lead to more massive ejection of 44Ti and 56Ni and larger ratios . Faster rotation also results in more massive ejection of 44Ti and 56Ni. Ratios are however independent from rotation. Large masses of 44Ti and large ratios observed in SN 1987A and Cas A (> 1O−4M⊙ and 1-2 respectively) are not realized in all the models.