Constraining Type Ia supernovae through their heights in edge-on galaxies

ABSTRACT In this Letter, using classified 197 supernovae (SNe) Ia, we perform an analysis of their height distributions from the disc in edge-on spirals and investigate light-curve (LC) decline rates (Δm15). We demonstrate, for first time, that 91T- 91bg-like subclasses SNe Ia are distributed differently toward plane host disc. The average its comparison with scales thin/thick components gives a possibility to roughly estimate progenitor ages: 91T-like events, being at smallest heights, originate relatively younger progenitors ages about several 100 Myr, SNe, having highest distribution, arise significantly older ∼10 Gyr, normal which between those two others, one up Gyr. find correlation LC SN is explained by vertical age gradient stellar population discs sub-Chandrasekhar mass white dwarf explosion models, where Δm15 parameter indicator.