SN2017ein: bolometric light curve and physical parameters

Abstract

Apparent stellar magnitudes observed at Maidanak observatory for SN2017ein - peculiarly faint core-collapse supernova rumored to have images of progenitor - are processed to get exact photometric data. Technique of photometry is described and the data itself is presented. Based on photometric data of B and R bands we used the regressional equation proposed by Lyman and Bersier to reconstruct the quasi-bolometric light curve. Reconstructed light curve has a peak luminosity of $3.3\cdot 10^{41} \rm{erg/s}$ which is almost an order of magnitude lower than typical values for such supernovae. Further, we used reconstructed bolometric values to estimate physical parameters using simple one-component models for photospheric and nebular phases. Fitting the models to reconstructed quasi-bolometric light curve allows us to estimate physical parameters. Such estimation yields $0.037 M_{\odot}$ for nickel-56 mass, $1.246 M_{\odot}$ for ejected mass and $1.641\cdot 10^{51}$ erg for final kinetic energy of ejecta. Ejecta mass looks very small for proposed progenitor candidate, but some explanations for such discrepancy are already proposed.