Constraints on the Progenitor of Cassiopeia A
  We compare a suite of 3D explosion calculations and stellar models incorporating advanced physics with observational constraints on the progenitor of Cassiopeia A. We consider binary and single stars from 16 to 40 solar masses with a range of explosion energies and geometries. The parameter space allowed by observations of nitrogen rich high velocity ejecta, ejecta mass, compact remnant mass, and 44Ti and 56Ni abundances individually and as an ensemble is considered. A progenitor of 15-25 solar masses which loses its hydrogen envelope to a binary interaction and undergoes an energetic explosion can match all the observational constraints. 
Patrick A. Young (1,2), Chris L. Fryer (1,3), Aimee Hungerford (1),   David Arnett (2), Gabriel Rockefeller (1,3), F. X. Tim...