Multicolour modelling of SN 2013dx associated with GRB 130702A

TL;DR

This paper presents detailed optical observations and multicolour light curve modeling of SN 2013dx, associated with GRB 130702A, revealing key physical parameters of the explosion and progenitor star.

Contribution

It provides the second-best sampled GRB-associated supernova light curves and applies numerical modeling to derive physical parameters of the explosion and progenitor star.

Findings

Derived progenitor star mass of 25 solar masses.

Estimated total explosion energy of 3.5 x 10^52 erg.

Determined nickel mass of 0.2 solar masses.

Abstract

We present optical observations of SN 2013dx, related to the Fermi burst GRB 130702A occurred at a redshift z = 0.145. It is the second-best sampled GRB-SN after SN~1998bw: the observational light curves contain more than 280 data points in uBgrRiz filters until 88 day after the burst, and the data were collected from our observational collaboration (Maidanak Observatory, Abastumani Observatory, Crimean Astrophysical Observatory, Mondy Observatory, National Observatory of Turkey, Observatorio del Roque de los Muchachos) and from the literature. We model numerically the multicolour light curves using the one-dimensional radiation hydrodynamical code STELLA, previously widely implemented for the modelling of typical non-GRB SNe. The best-fitted model has the following parameters: pre-supernova star mass M = 25 M_Sun, mass of a compact remnant M_CR = 6 M_Sun, total energy of the outburst E_oburst = 3.5 x 10^(52) erg, pre-supernova star radius R = 100 R_Sun, M_56Ni = 0.2 M_Sun which is totally mixed through the ejecta; M_O = 16.6 M_Sun, M_Si = 1.2 M_Sun, and M_Fe = 1.2 M_Sun, and the radiative efficiency of the SN is 0.1 per cent.