Modelling of SN2013dx associated with the low-redshift GRB130702A points to diversity in GRB/SN properties
Date Issued
2021
Author(s)
Abstract
The properties of the broad-lined type Ic supernova (SN) 2013dx, associated
with the long gamma-ray burst GRB130702A at a redshift z = 0.145, are derived
via spectral modelling. SN2013dx was similar in luminosity to other GRB/SNe,
with a derived value of the mass of 56Nickel ejected in the explosion of ~0.4
Msun. However, its spectral properties suggest a smaller explosion kinetic
energy. Radiation transport models were used to derive a plausible mass and
density distribution of the SN ejecta in a one-dimensional approximation. While
the mass ejected in the explosion that is obtained from the modelling (Mej ~ 9
Msun) is similar to that of all other well-studied GRB/SNe, the kinetic energy
is significantly smaller (KE ~ 10^{52}erg). This leads to a smaller KE/Mej
ratio, ~ 10^{51} erg/Msun, which is reflected in the narrower appearance of the
spectral lines. While the low KE does not represent a problem for the scenario
in which magnetar energy aids powering the explosion and the nucleosynthesis,
it is nevertheless highly unusual. SNe Ic with similar KE have never been seen
in coincidence with a GRB, and no well-observed GRB/SN has shown similarly low
KE and KE/Mej.
Volume
505
Issue
3
Start page
4106
Issn Identifier
0035-8711
Rights
open.access
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