Broad-line Type Ic supernova SN 2014ad

Sahu, D K ; Anupama, G C ; Chakradhari, N K ; Srivastav, S ; Tanaka, Masaomi ; Maeda, Keiichi ; Nomoto, Ken'ichi (2018) Broad-line Type Ic supernova SN 2014ad Monthly Notices of the Royal Astronomical Society, 475 (2). pp. 2591-2604. ISSN 0035-8711

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Official URL: http://doi.org/10.1093/mnras/stx3212

Related URL: http://dx.doi.org/10.1093/mnras/stx3212

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⊙.

Item Type:Article
Source:Copyright of this article belongs to The Royal Astronomical Society
Keywords:techniques: photometric, techniques: spectroscopic, supernovae: general, supernovae: individual: SN 2014ad, galaxies: individual: Mrk 1309
ID Code:130620
Deposited On:01 Dec 2022 11:09
Last Modified:01 Dec 2022 11:09

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