Type Ia Supernovae and Remnant Neutron Stars
  On the basis of the current observational evidence, we put forward the case that the merger of two CO white dwarfs produces both a Type Ia supernova explosion and a stellar remnant, the latter in the form of a magnetar. The estimated occurrence rates raise the possibility that many, if not most, SNe Ia might result from white dwarf mergers. 
A.R. King (1,2), J.E. Pringle (2) and D.T. Wickramasinghe (2,3) ((1)   Univ. of Leicester, (2) IoA Cambridge, (3) Astrophysi...