Presentation #551.17 in the session “Supernova”.
The stellar progenitors of Type Ia Supernovae (SNe Ia) are still debated. PTF11kx provided ground-breaking evidence for the single -degenerate channel (main sequence or red giant star companion) because it showed interaction with ~0.2 Solar Masses of hydrogen-rich material, too low of a mass to be the core-degenerate scenario. PTF11kx-like SNe Ia are rare but it’s unknown whether their rarity is due to the single-degenerate channel or a long delay between mass ejection and SN. Delayed interaction causes photometric light-curves to flatten at late times and be brighter than their non-interacting counterparts. Therefore, we undertook a search of the Zwicky Transient Facility r-band public data for SNe Ia that are over luminous at late times. We obtained light-curves from a sample that is representative of the intrinsic SN Ia distribution at z < 0.02. From this, we found instances of late-time interactions that could illuminate the rate of these PTF11kx-like SNe Ia upon further study.