The circumstellar matter of supernova 2014J and the core-degenerate scenario (February 2015)

I show that the circumstellar matter of the type Ia supernova 2014J is too massive and its momentum too large to be accounted for by any but the core-degenerate scenario for type Ia supernovae. I conclude that if the absorbing gas originated from the progenitor of SN 2014J, then a common envelope phase took place about 15,000 years ago, leading to the merging of the core with the white dwarf companion, i.e., the core-degenerate scenario. Else, the absorbing material is of interstellar medium origin.  Paper was posted on astro-ph.