Radio view of a broad-line Type Ic supernova ASASSN-16fp

Abstract

We present extensive radio observations of a Type Ic supernova, ASASSN-16fp. Our data represents the lowest frequency observations of the SN beyond 1000 days with a frequency range of $0.33-25$ GHz and a temporal range of $\sim$ 8 to 1136 days post-explosion. The observations are best represented by a model of synchrotron emission from a shocked circumstellar shell initially suppressed by synchrotron self-absorption. Assuming equipartition of energy between relativistic particles and magnetic fields, we estimate the velocity and radius of the blast wave to be $v\sim 0.15c$ and $r\sim 3.4$ $\times$ $10^{15}$ cm respectively at $t_0$ $\sim$ 8 days post-explosion. We infer the total internal energy of the radio-emitting material evolves as $E$ $\sim$ 0.37 $\times$ $10^{47}$ (t/t${}_0$)${}^{0.65}$ erg. We determine the mass-loss rate of the progenitor star to be $\dot{M}$ $\sim$ $(0.4-3.2)\times 10^{-5}$ $M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$ at various epochs post-explosion, consistent with the mass-loss rate of Galactic Wolf-Rayet stars. The radio light curves and spectra show a signature of density enhancement in the CSM at a radius of $\sim$ $1.10\times 10^{16}$ cm from the explosion center.

14 pages, 7 figures, Accepted for publication in MNRAS

References in corpus (9)

• Circumstellar Emission from Type Ib and Ic Supernovae
• The Broad-lined Type Ic SN 2003jd
• iPTF13bvn: The First Evidence of a Binary Progenitor for a Type Ib Supernova
• Evolutionary Models for Type Ib/c Supernova Progenitors
• Possible binary progenitors for the type Ib supernova iPTF13bvn
• IPAC Image Processing and Data Archiving for the Palomar Transient Factory
• Giant Metrewave Radio Telescope monitoring of the black hole X-ray binary, V404 Cygni, during its June 2015 outburst
• ASASSN-16fp (SN 2016coi): A transitional supernova between Type Ic and broad-lined Ic
• Broad-Lined Supernova 2016coi with Helium Envelope

Cited by in corpus (3)

• uGMRT observations of a Fast and Blue Optical Transient -- AT 2018cow
• The final months of massive star evolution from the circumstellar environment around SN Ic 2020oi
• Radio evolution of a Type IIb supernova SN 2016gkg