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

Abstract

In this Letter, using classified 197 supernovae (SNe) Ia, we perform an analyses of their height distributions from the disc in edge-on spirals and investigate their light-curve (LC) decline rates $(\Delta m_{15})$. We demonstrate, for the first time, that 91T- and 91bg-like subclasses of SNe Ia are distributed differently toward the plane of their host disc. The average height from the disc and its comparison with scales of thin/thick disc components gives a possibility to roughly estimate the SNe Ia progenitor ages: 91T-like events, being at the smallest heights, originate from relatively younger progenitors with ages of about several 100 Myr, 91bg-like SNe, having the highest distribution, arise from progenitors with significantly older ages $\sim 10$ Gyr, and normal SNe Ia, which distributed between those of the two others, are from progenitors of about one up to $\sim 10$ Gyr. We find a correlation between LC decline rates and SN Ia heights, which is explained by the vertical age gradient of stellar population in discs and a sub-Chandrasekhar mass white dwarf explosion models, where the $\Delta m_{15}$ parameter is a progenitor age indicator.

7 pages, 2 figures, 8 tables, online data, accepted for publication in MNRAS Letters

References in corpus (14)

• SkyMapper Southern Survey: Second Data Release (DR2)
• Ages of Type Ia Supernovae Over Cosmic Time
• Evidence for sub-Chandrasekhar-mass progenitors of Type Ia supernovae at the faint end of the width-luminosity relation
• The dust distribution in edge-on galaxies. Radiative transfer fits of V and K'-band images
• The distribution of interstellar dust in CALIFA edge-on galaxies via oligochromatic radiative transfer fitting
• The Catalog of Edge-on Disk Galaxies from SDSS. Part I: the catalog and the Structural Parameters of Stellar Disks
• Lick Indices in the Thin and Thick Disks of Edge-On Disk Galaxies
• Supernovae and their host galaxies -- VII. The diversity of Type Ia supernova progenitors
• The Evolution of the Type Ia Supernova Luminosity Function
• The continuous rise of bulges out of galactic disks
• Supernovae and their host galaxies - V. The vertical distribution of supernovae in disc galaxies
• SNIa Host Galaxy Properties and the Dust Extinction Distribution
• The vertical metallicity gradients of mono-age stellar populations in the Milky Way with the RAVE and Gaia data
• A prediction on the age of thick discs as a function of the stellar mass of the host galaxy

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