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Out of One, Many: Distinguishing Time Delays from Lensed Supernovae

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arxiv 2109.13282 v2 pith:F4N56QOH submitted 2021-09-27 astro-ph.CO

Out of One, Many: Distinguishing Time Delays from Lensed Supernovae

Mikhail Denissenya , Satadru Bag , Alex G. Kim , Eric V. Linder , Arman Shafieloo This is my paper
classification astro-ph.CO
keywords imagestimedelayslenseddeterminingsupernovaeblendedconstant
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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 and their time delayed and magnified fluxes may be unresolved, however, blended into a single lightcurve. We demonstrate methods without a fixed source template matching for extracting the individual images, determining whether there are one (no lensing) or two or four (lensed) images, and measuring the time delays between them that are valuable cosmological probes. We find 100% success for determining the number of images for time delays greater than $\sim10$ days.

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  1. Finding Strongly Lensed Supernovae from Blended Light Curves

    astro-ph.IM 2026-04 unverdicted novelty 4.0

    A model-independent method fits blended supernova light curves as superpositions of two time-delayed components and finds only one candidate above a 12-day delay threshold in 445 ZTF Type Ia supernovae, for a 0.22% fa...