Arpine G. Karapetyan
Center for Cosmology and Astrophysics, Alikhanyan National Science Laboratory, Armenia

Abstract
Based on a sample of supernovae (SNe) Ia hosted in spiral galaxies and our measurements of their distances from the nearby spiral arms, we analyze the SNe distribution relative to the host arms and investigate their light curve decline rates (Δm15). We find that arm SNe Ia typically have smaller (slower declining) Δm15 values than those which are located in interarm regions (faster declining). We illustrate that there is a correlation between the SN Ia distances from the spiral arms and their galactocentric radii: SNe Ia are located close to the inner and outer edges (shock fronts) of spiral arms, respectively, before and after galactic corotation radii. In this study, we find a significant correlation between the SN distances from the shock fronts of the arms (progenitor birthplace) and their Δm15 values. The sub-Chandrasekhar-mass white dwarf explosion models and density wave theory, where SN progenitors were born around shock fronts of spiral arms and migrate crossing the spiral pattern to the explosion sites, are used to explain these results, where the Δm15 parameter and SN distance from the shock front are suitable progenitor age indicators.

2024 June 12, 13:30

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