The fast evolving type Ib Supernova SN 2015dj in NGC 7371

TL;DR

This paper presents a detailed optical study of the type Ib supernova SN 2015dj, including light curve analysis, spectral evolution, and progenitor mass estimation, contributing new insights into its explosion parameters and progenitor system.

Contribution

It provides the first comprehensive optical evolution analysis of SN 2015dj, including modeling of its light curve and spectral features, and estimates progenitor properties suggesting a binary origin.

Findings

SN 2015dj peaks at M_V = -17.37 mag.

Ejecta mass estimated at 1.4 M_sun.

Progenitor mass between 13-20 M_sun.

Abstract

We present the detailed optical evolution of a type Ib SN 2015dj in NGC 7371, using data spanning up to $\sim$ 170 days after discovery. SN 2015dj shares similarity in light curve shape with SN 2007gr and peaks at M$_{V}$ = $-17.37\pm$0.02 mag. Analytical modelling of the quasi bolometric light curve yields 0.06$\pm$0.01 M$_{\odot}$ of $^{56}$Ni, ejecta mass $M_{\rm ej} = 1.4^{+1.3}_{-0.5}$ \msol\, and kinetic energy $E_{\rm k} = 0.7^{+0.6}_{-0.3} \times 10^{51}$ erg. The spectral features show a fast evolution and resemble those of spherically symmetric ejecta. The analysis of nebular phase spectral lines indicate a progenitor mass between 13-20 M$_{\odot}$ suggesting a binary scenario.