sep 062012
 
Where are the Companions of Supernovae?

  Japanese researchers discovered that a Type Ia supernova occurs after its companion star evolves into a faint helium white dwarf in many cases, given the fact that the white dwarf is spinning in the progenitor system. Figure 1. Configuration of progenitor binary system in the case of a red-giant (left) and a white dwarf (right, [continue reading]