Name: Brajesh Kumar
Affiliation: Aryabhatta Research Institute of Observational Sciences, Nainital
Conference ID : ASI2022_689
Title : Type Ib supernova SN 2017iro: A moderately luminous event with a possible binary progenitor
Authors : Brajesh Kumar, Avinash Singh, D. K. Sahu, and G. C. Anupama
Abstract Type: Oral
Abstract Category : Extragalactic Astronomy
Abstract : We present results based on densely sampled optical imaging (UBVRI-bands) and medium-resolution spectroscopic follow-up of nearby (~31 Mpc) Type Ib supernova (SN) 2017iro. The observations were carried out with the 2-m Himalayan Chandra Telescope (IAO, Hanle) spanning from -7 to + 266 day with respect to the B-band maximum. With a peak absolute magnitude in V-band (MV) = -17.76 ± 0.15 mag and bolometric luminosity (log10L) = 42.39 ± 0.09 erg s^-1, SN 2017iro is moderately luminous. The explosion parameters were estimated by fitting different analytical models to the quasi-bolometric light curve of SN 2017iro. Mass of 56Ni synthesized in the explosion has a range of ~0.05 – 0.10 MSun, the ejecta mass ~1.4 – 4.3 MSun, and the kinetic energy ~0.8 – 1.9 × 10^51 erg. The investigation of the nebular phase spectrum (+209 day) indicates an oxygen mass of ~0.35 MSun. The smaller [O I ]/[Ca II ] flux ratio of ~1 favours a progenitor with a zero-age main-sequence mass in the range ~13–15 MSun, which likely underwent stripping due to a binary companion, similar to the case of iPTF13bvn.