Spectroscopy of the Type Ic Supernova SN\,2017iuk Associated with Low-redshift GRB\,171205A

TL;DR

This paper presents spectroscopic observations of the supernova SN 2017iuk associated with a low-luminosity gamma-ray burst, identifying it as a typical broad-line type Ic supernova and comparing it to SN 2006aj.

Contribution

It provides the first detailed spectroscopic monitoring of SN 2017iuk at low redshift and compares its properties to a similar supernova, suggesting neutron star formation in the core-collapse event.

Findings

SN 2017iuk is a typical broad-line type Ic supernova.

Spectral and velocity evolution resemble SN 2006aj.

The host galaxy is an early type, high-mass, star-forming galaxy with low SFR.

Abstract

We here report a spectroscopic monitor for the supernova SN\,2017iuk associated with the long-duration low-luminosity gamma-ray burst GRB\,171205A at a redshift of 0.037, which is up to now the third GRB-SN event away from us. Our spectroscopic observations and spectral analysis allow us to identify SN\,2017iuk as a typical broad-line type Ic SN. A comparison study suggests that the type-IcBL SN\,2017iuk resembles to SN\,2006aj in following aspects: 1) similar spectra at the nearby epochs, 2) comparable evolution of the photospheric velocity obtained from the measurements based on both \ion{Si}{2}$\lambda$6355 line and spectral modeling, and 3) comparable explosion parameters. This analogy could imply a formation of a neutron star in the core-collapse of GRB\,171205A/SN\,2017iuk as previously suggested in GRB\,060218/SN\,2006aj. The properties of the host galaxy is discussed, which suggests that GRB\,171205A/SN\,2017iuk occurred in an early type (S0), high-mass, starforming galaxy with low specific SFR and solar metallicity.