The Dark Energy Survey 5-year photometrically classified type Ia supernovae without host-galaxy redshifts

Understand

Current and future Type Ia Supernova (SN Ia) surveys will need to adopt new approaches to classifying SNe and obtaining their redshifts without spectra if they wish to reach their full potential.

• We present here a novel approach that uses only photometry to identify SNe Ia in the 5-year Dark Energy Survey (DES) dataset using the SuperNNova classifier.
• Our approach, which does not rely on any information from the SN host-galaxy, recovers SNe Ia that might otherwise be lost due to a lack of an identifiable host.
• We select 2,298 high-quality SNe Ia from the DES 5-year dataset an almost complete sample of detected SNe Ia.