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The classic single-degenerate model for the progenitors of Type Ia Supernova(SN Ia) predicts that the supernova ejecta should be enriched with solar-likeabundance material stripped from the companion star. Spectroscopic observationsof normal SNe Ia at late times, however, have not resulted in definitedetection of hydrogen. In this Letter, we study line formation in SNe Ia atnebular times using non-LTE spectral modeling. We present, for the first time,multidimensional radiative transfer calculations of SNe Ia with strippedmaterial mixed in the ejecta core, based on hydrodynamical simulations ofejecta-companion interaction. We find that interaction models with mainsequence companions produce significant H$\alpha$ emission at late times,ruling out this type of binaries being viable progenitors of SNe Ia. We alsopredict significant He I line emission at optical and near-infrared wavelengthsfor both hydrogen-rich or helium-rich material, providing an additionalobservational probe of stripped ejecta. We produce models with reduced strippedmasses and find a more stringent mass limit of $M_{st} \lesssim 1\times 10^{-4}M_\odot$ of stripped companion material for SN 2011fe.

the astrophysical journal. letters

Multidimensional Models of Type Ia Supernova Nebular Spectra: Strong  Emission Lines from Stripped Companion Gas Rule Out Classic Single Degenerate  Systems