He-accreting WDs as SNe Ia Progenitors
  We investigate the thermal response of CO WDs accreting He-rich matter directly from their companions in binary systems. Our results suggest that the He-channel cannot provide progenitors for majority of "normal" SNe Ia. 
Luciano Piersanti, Amedeo Tornambe', Lev Yungelson and Oscar Straniero
astro-ph.SR