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Title: Broad-line Type Ic supernova SN 2014ad
Authors: Sahu, D. K
Anupama, G. C
Chakradhari, N. K
Srivastav, S
Tanaka, M
Maeda, K
Nomoto, K
Keywords: Techniques: photometric;Techniques: spectroscopic;Supernovae: general;Supernovae: individual: SN 2014ad;Galaxies: individual: Mrk 1309
Issue Date: Apr-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 475, No. 2, pp. 2591–2604
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) × 1052 erg and a total ejected mass of ∼(3.3 ± 0.8) M⊙, and that ∼0.24 M⊙ of 56Ni was synthesized in the explosion. The metallicity of the host galaxy near the supernova region is estimated to be ∼0.5 Z⊙.
Description: Restricted Access
ISSN: 1365-2966
???metadata.dc.rights???: © Royal Astronomical Society
Appears in Collections:IIAP Publications

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