Supernova Rates and Luminosity Functions from ASAS-SN I: 2014--2017 Type Ia SNe and Their Subtypes

Abstract

We present the volumetric rates and luminosity functions (LFs) of Type Ia supernovae (SNe Ia) from the $V$-band All-Sky Automated Survey for Supernovae (ASAS-SN) catalogues spanning discovery dates from UTC 2014-01-26 to UTC 2017-12-29. Our standard sample consists of 404 SNe Ia with $m_{V,\mathrm{peak}}<17$ mag and Galactic latitude $|b|>15^{\circ }$. Our results are both statistically more precise and systematically more robust than previous studies due to the large sample size and high spectroscopic completeness. We make completeness corrections based on both the apparent and absolute magnitudes by simulating the detection of SNe Ia in ASAS-SN light curves. We find a total volumetric rate for all subtypes of $R_{\mathrm{tot}}=2.28_{-0.20}^{+0.20}\times 10^4{\mathrm{yr}}^{-1}{\mathrm{Gpc}}^{-3}{h}_{70}^3$ for $M_{V,\mathrm{peak}}<-16.5$ mag ($R_{\mathrm{tot}}=1.91_{-0.12}^{+0.12}\times 10^4{\mathrm{yr}}^{-1}{\mathrm{Gpc}}^{-3}{h}_{70}^3$ for $M_{V,\mathrm{peak}}<-17.5$ mag) at the median redshift of our sample, $z_{\mathrm{med}}=0.024$. This is in agreement ($1\sigma$) with the local volumetric rates found by previous studies. We also compile luminosity functions (LFs) for the entire sample as well as for subtypes of SNe Ia for the first time. The major subtypes with more than one SN include Ia-91bg, Ia-91T, Ia-CSM, and Ia-03fg with total rates of $R_{\mathrm{Ia}-91bg}=1.4_{-0.5}^{+0.5}\times 10^3{\mathrm{yr}}^{-1}{\mathrm{Gpc}}^{-3}{h}_{70}^3$, $R_{\mathrm{Ia}-91T}=8.5_{-1.7}^{+1.6}\times 10^2{\mathrm{yr}}^{-1}{\mathrm{Gpc}}^{-3}{h}_{70}^3$, $R_{\mathrm{Ia}-\mathrm{CSM}}=10_{-7}^{+7}{\mathrm{yr}}^{-1}{\mathrm{Gpc}}^{-3}{h}_{70}^3$, and $R_{\mathrm{Ia}-03fg}=30_{-20}^{+20}{\mathrm{yr}}^{-1}{\mathrm{Gpc}}^{-3}{h}_{70}^3$, respectively. We estimate a mean host extinction of $E(V-r)\approx 0.2$ mag based on the shift between our $V$-band and the ZTF $r$-band LFs.

arXiv comment14 pages, 9 figures, 8 tables, accepted to MNRAS

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