Broad-line Type Ic supernova SN 2014ad. Issue 2 (31st January 2018)

• Record Type: Journal Article
• Authors: Sahu, D K; Anupama, G C; Chakradhari, N K; Srivastav, S; Tanaka, Masaomi; Maeda, Keiichi; Nomoto, Ken'ichi
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 475:Issue 2(2018)
• Page Start: 2591
• Page End: 2604
• Publication Date: 2018-01-31
• Subjects: techniques: photometric -- techniques: spectroscopic -- supernovae: general -- supernovae: individual: SN 2014ad -- galaxies: individual: Mrk 1309; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stx3212
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: We present optical and ultraviolet photometry and low-resolution optical spectroscopy of the broad-line Type Ic supernova SN 2014ad in the galaxy PGC 37625 (Mrk 1309), covering the evolution of the supernova during −5 to +87 d with respect to the date of maximum in the B band. A late-phase spectrum obtained at +340 d is also presented. With an absolute V -band magnitude at peak of MV = −18.86 ± 0.23 mag, SN 2014ad is fainter than supernovae associated with gamma ray bursts (GRBs), and brighter than most of the normal and broad-line Type Ic supernovae without an associated GRB. The spectral evolution indicates that the expansion velocity of the ejecta, as measured using the Si ii line, is as high as ∼33 500 km s −1 around maximum, while during the post-maximum phase it settles at ∼15 000 km s −1 . The expansion velocity of SN 2014ad is higher than that of all other well-observed broad-line Type Ic supernovae except for the GRB-associated SN 2010bh. The explosion parameters, determined by applying Arnett's analytical light-curve model to the observed bolometric light-curve, indicate that it was an energetic explosion with a kinetic energy of ∼(1 ± 0.3) × 10 52 erg and a total ejected mass of ∼(3.3 ± 0.8) M⊙, and that ∼0.24 M⊙ of 56 Ni was synthesized in the explosion. The metallicity of the host galaxy near the supernova region is estimated to be ∼0.5 Z⊙ .