Modelling of SN 2013dx associated with the low-redshift GRB130702A points to 
diversity in GRB/SN properties

Mazzali, P. A.; Pian, E.; Bufano, F.; Ashall, C.

doi:10.1093/mnras/stab1594

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Modelling of SN 2013dx associated with the low-redshift GRB130702A points to diversity in GRB/SN properties

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Pian, E.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Citation

Mazzali, P. A., Pian, E., Bufano, F., & Ashall, C. (2021). Modelling of SN 2013dx associated with the low-redshift GRB130702A points to diversity in GRB/SN properties. Monthly Notices of the Royal Astronomical Society, 505(3), 4106-4119. doi:10.1093/mnras/stab1594.

Cite as: https://hdl.handle.net/21.11116/0000-0009-5F9C-E

Abstract

The properties of the broad-lined Type Ic supernova (SN) 2013dx, associated with the long gamma-ray burst GRB 130702A at a redshift z = 0.145, are derived via spectral modelling. SN 2013dx was similar in luminosity to other GRB/SNe, with a derived value of the mass of ⁵⁶Ni ejected in the explosion of ≈0.4 M_⊙. 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 (M_ej ≈ 9 M_⊙) is similar to that of all other well-studied GRB/SNe, the kinetic energy is significantly smaller (E_K ∼ 10⁵² erg). This leads to a smaller E_K/M_ej ratio, ≈10⁵¹ erg/M_⊙, which is reflected in the narrower appearance of the spectral lines. While the low E_K 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 E_K have never been seen in coincidence with a GRB, and no well-observed GRB/SN has shown similarly low E_K and E_K/M_ej.