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A generic prediction of the single-degenerate model for Type Ia supernovae(SNe Ia) is that a significant amount of material will be stripped from thedonor star (~0.5 Msun for a giant donor and ~0.15 Msun for a main sequencedonor) by the supernova ejecta. This material, excited by gamma-rays fromradioactive decay, would then produce relatively narrow (1000 km s-1) emissionfeatures observable once the supernova enters the nebular phase. Such emissionhas never been detected, which already provides strong constraints on Type Iaprogenitor models. In this Letter we report the deepest limit yet on thepresence of H-alpha emission originating from the stripped hydrogen in thenebular spectrum of a Type Ia supernova obtained using a high signal-to-noisespectrum of the nearby normal SN Ia 2011fe 274 days after B-band maximum lightwith the Large Binocular Telescope's Multi-Object Double Spectrograph. We put aconservative upper limit on the H-alpha flux of 3.14 x 10^-17 erg s-1 cm-2,which corresponds to a luminosity of 1.57 x 10^35 erg s-1. By scaling modelsfrom the literature, our flux limit translates into an upper limit of 0.001Msun of stripped material. This is an order of magnitude stronger than previouslimits. SN 2011fe was a typical Type Ia supernova, special only in itsproximity, and we argue that lack of hydrogen emission in its nebular spectrumadds yet another strong constraint on the single degenerate class of models forSNe Ia.

No Stripped Hydrogen in the Nebular Spectra of Nearby Type Ia Supernova 2011fe