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This paper - http://arxiv.org/abs/1505.05158, Strong Ultraviolet Pulse From a Newborn Type Ia Supernova- discusses the first well established evidence of a type Ia supernova formed via the single degenerate mode. The double degenerate mode has gained considerable support over the past decade or so given the lack of evidence of any surviving companion star after an SNIa event. The single degenerate mode suffers the undeniable [and fortuitous] handicap that SNIa are generally too distant to permit detection of any surviving companion stars. It appears this particular SNIa belongs to a class of subluminous SNIa that are generally not relied upon as standard candles, although potential cosmological implications are not really addressed.
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