Progenitor for Type Ic Supernova 2007bi

We investigate the evolution of very massive stars with Z = 0.2 Z _⊙ to constrain the progenitor of the extremely luminous Type Ic SN 2007bi. In order to reproduce the ⁵⁶Ni amount produced in SN 2007bi, the range of the stellar mass at the zero-age main-sequence is expected to be 515 - 575M _⊙ for pair-instability supernova and 110 - 280M _⊙ for core-collapse supernova. Uncertainty in the mass loss rate affects the mass range appropriate for the explosion of SN 2007bi. A core-collapse supernova of a WO star evolved from a 110 M _⊙ star produces sufficient radioactive ⁵⁶Ni to reproduce the light curve of SN 2007bi.