Multicolour modelling of SN 2013dx associated with GRB 130702A
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 MSun, mass of a compact remnant MCR = 6 MSun, total energy of the outburst Eoburst = 3.5 x 10(52) erg, pre-supernova star radius R = 100 RSun, M56Ni = 0.2 MSun which is totally mixed through the ejecta; MO = 16.6 MSun, MSi = 1.2 MSun, and MFe = 1.2 MSun, and the radiative efficiency of the SN is 0.1 per cent.
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