Out of one, many: distinguishing time delays from lensed supernovae

ABSTRACT Gravitationally lensed Type Ia supernovae are an emerging probe with great potential for constraining dark energy, spatial curvature, and the Hubble constant. The multiple images their time delayed magnified fluxes may be unresolved, however, blended into a single light curve. We demonstrate methods without fixed source template matching extracting individual images, determining whether there one (no lensing) or two four (lensed) measuring delays between them that valuable cosmological probes. find 100 per cent success number of greater than ∼10 d.