2021ApJ...908...75B

We assemble a large set of 2-10 GHz radio flux density measurements and upper limits of 294 different supernovae (SNe), from the literature and our own and archival data. Only 31% of SNe were detected. We characterize the SN radio lightcurves near the peak using a two-parameter model, with t_pk being the time to rise to a peak and L_pk the spectral luminosity at that peak. Over all SNe in our sample at D < 100 Mpc, we find that t_pk = 10^1.7±0.9 days and that L_pk = 10^25.5±1.6 erg s^–1 Hz^–1, and therefore that generally 50% of SNe will have L_pk < 10^25.5 erg s^–1 Hz^–1. These L_pk values are ∼30 times lower than those for only detected SNe. Types Ib/c and II (excluding IIn's) have similar mean values of L_pk but the former have a wider range, whereas Type IIn SNe have ∼10 times higher values with L_pk = 10^26.5±1.1 erg s^–1 Hz^–1. As for t_pk, Type Ib/c have t_pk of only 10^1.1±0.5 days while Type II have t_pk = 10^1.6±1.0 and Type IIn the longest timescales with t_pk = 10^3.1±0.7 days. We also estimate the distribution of progenitor mass-loss rates, {dot}M, and find that the mean and standard deviation of log₁₀({dot}M/[M_☉yr^–1]) are -5.4 ± 1.2 (assuming v_wind = 1000 km s^–1) for Type Ib/c SNe, and -6.9 ± 1.4 (assuming v_wind = 10 km s^–1) for Type II SNe excluding Type IIn.