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In the single degenerate (SD) scenario of type Ia supernovae (SNe Ia), thecollision of the ejecta with its companion results in stripping hydrogen richmatter from the companion star. This hydrogen rich matter might leave its tracein the light curves and/or spectra. In this paper, we perform radiationhydrodynamical simulations of this collision for three binary systems. As aresult, we find that the emission from the shock-heated region is not as strongas in the previous study. This weak emission, however, may be a result of ourunderestimate of the coupling between the gas and radiation in the shockinteraction. Therefore, though our results suggest that the observed earlylight curves of SNe Ia can not rule out binary systems with a short separationas the progenitor system, more elaborate numerical studies will be needed toreach a fair conclusion. Alternatively, our results indicate that the featureobserved in the early phase of a recent type Ia SN 2014J might result frominteraction of the ejecta with a red giant companion star. We also discuss thedependence of spectral features of H alpha and Si II absorption lines onviewing angles and investigate whether they can constrain the event rate of theSD progenitor.

Revealing progenitors of type Ia supernovae from their light curves and spectra