Kavli Affiliate: Subo Dong
| Summary:
We present volumetric rates and luminosity functions (LFs) of Type Ia supernovae (SNe Ia) from the All-Sky Automated Survey for Supernovae (ASAS-SN), covering the 11-year period from 2014 to 2024. By combining the 2014–2017 $V$-band sample with the 2018–2024 $g$-band sample, we construct a large statistical dataset of $1776$ SNe Ia. We compute completeness corrections based on injection-recovery simulations of the ASAS-SN light curves, taking into account the variations in light curve shapes. For our standard sample ($M_g,mathrmpeak<-16.0$ mag), we extract a total volumetric SN Ia rate of $R_mathrmtot = (2.55 pm 0.12) times 10^4,mathrmyr^-1,mathrmGpc^-3,h_70^3$ at a median redshift of $z=0.029$. With a statistical uncertainty of $4.7%$, this is the most precise local measurement to date. While the "normal" SNe Ia account for $(92.7 pm 1.9)%$ of this rate, the total LF reveals immense diversity, with $M_g,mathrmpeak$ spanning over five magnitudes. The LF of SNe Iax is also broad and rises toward lower luminosities, resulting in a likely lower limit of $(4.3 pm 1.8)%$ of the total rate. We place strong constraints on the rate of SNe Ia-CSM, finding they account for only $(0.036 pm 0.017)%$ of the total local rate. Finally, we find that the low-luminosity 02es-like SNe are $7 pm 5$ times more common than the luminous 03fg-like SNe. This places demographic constraints on models proposing a physical continuum for these two subtypes, implying that any common channel for the two classes must strongly favor lower-luminosity explosions.
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