Kavli Affiliate: Subo Dong
| First 5 Authors: T. Pessi, T. Pessi, , ,
| Summary:
The volumetric rates and luminosity functions (LFs) of core-collapse
supernovae (ccSN) and their subtypes are important for understanding the cosmic
history of star formation and the buildup of ccSN products. To estimate these
rates, we use data of nearby ccSNe discovered by the All-Sky Automated Survey
for Supernovae (ASAS-SN) from 2014–2017, when all observations were made in
the $V$-band. The sample is composed of 174 discovered or recovered events,
with high spectroscopic completeness from followup observations. This allows us
to obtain a statistically precise and systematically robust estimate of nearby
rates for ccSNe and their subtypes. The volumetric rates are estimated by
correcting the observed number of events for the survey completeness, which was
estimated through injection recovery simulations using ccSN light curves. We
find a total volumetric rate for ccSNe of $7.0^+1.0_-0.9 times 10^-5
textrmyr^-1 textrmMpc^-3 h^3_70$, at a median redshift of
0.0149, for absolute magnitudes at peak $M_V,peak leq -14$ mag. This result
is in agreement with previous local volumetric rates. We obtain volumetric
rates for the different ccSN subtypes (II, IIn, IIb, Ib, Ic, Ibn, and Ic-BL),
and find that the relative fractions of Type II, stripped-envelope, and
interacting ccSNe are $63.2%$, $32.3%$, and $4.4%$, respectively. We also
estimate a volumetric rate for superluminous SNe of $1.5^+4.4_-1.1
textrmyr^-1 textrmGpc^-3 h^3_70$, corresponding to a fraction
of $0.002%$ of the total ccSN rate. We produce intrinsic $V$-band LFs of ccSNe
and their subtypes, and show that ccSN rates steadily decline for increasing
luminosities. We further investigate the specific ccSN rate as a function of
their host galaxy stellar mass, and find that the rate decreases with
increasing stellar mass, with significantly higher rates at lower mass
galaxies.
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