Investigating the observational properties of Type Ib supernova SN 2017iro

Abstract

We report results of optical imaging and low-resolution spectroscopic monitoring of supernova (SN) 2017iro that occurred in the nearby ($\sim$\,31 Mpc) galaxy NGC 5480. The \ion{He}{1} 5876 Å\, feature present in the earliest spectrum (--\,7 d) classified it as a Type Ib SN. The follow-up observations span from --\,7 to +\,266 d with respect to the $B$-band maximum. With a peak absolute magnitude in $V$-band, ($M_V$)\,=\,$-17.76\pm 0.15$ mag and bolometric luminosity (log${}_{10}$\,L)\,=\,42.39\,$\pm$\, 0.09 erg s${}^{-1}$, SN 2017iro is a moderately luminous Type Ib SN. The overall light curve evolution of SN 2017iro is similar to SN 2012au and SN 2009jf during the early (up to $\sim$100 d) and late phases ($>$150 d), respectively. The line velocities of both \ion{Fe}{2} 5169 Å\, and \ion{He}{1} 5876 Å\, are $\sim$\,9000 km s${}^{-1}$ near the peak. The analysis of the nebular phase spectrum ($\sim$\,+209 d) indicates an oxygen mass of $\sim$\,0.35 M${}_{\odot }$. The smaller [\ion{O}{1}]/[\ion{Ca}{2}] flux ratio of $\sim$\,1 favours a progenitor with a zero-age main-sequence mass in the range $\sim$\,13--15 M${}_{\odot }$, most likely in a binary system, similar to the case of iPTF13bvn. The explosion parameters are estimated by applying different analytical models to the quasi-bolometric light curve of SN 2017iro. ${}^{56}$Ni mass synthesized in the explosion has a range of $\sim$\,0.05\,--\,0.10 M${}_{\odot }$, the ejecta mass $\sim$1.4\,--\,4.3 M${}_{\odot }$ and the kinetic energy $\sim$\,0.8\,--\,1.9\,$\times$ 10${}^{51}$ erg.

23 pages, 15 figures, 8 tables. Accepted for publication in ApJ

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