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Supernova 2013fc in a circumnuclear ring of a luminous infrared galaxy: the big brother of SN 1998S

Kangas, T and Mattila, S and Kankare, E and Lundqvist, P and Vaeisaenen, P and Childress, M and Pignata, G and McCully, C and Valenti, S and Vinko, J and Pastorello, A and Elias-Rosa, N and Fraser, M and Gal-Yam, A and Kotak, R and Kotilainen, JK and Smartt, SJ and Galbany, L and Harmanen, J and Howell, DA and Inserra, C and Marion, GH and Quimby, RM and Silverman, JM and Szalai, T and Wheeler, JC and Ashall, C and Benetti, S and Romero-Canizales, C and Smith, KW and Sullivan, M and Takats, K and Young, DR (2016) Supernova 2013fc in a circumnuclear ring of a luminous infrared galaxy: the big brother of SN 1998S. Monthly Notices of the Royal Astronomical Society, 456 (1). pp. 323-346. ISSN 0035-8711

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Abstract

We present photometric and spectroscopic observations of SN 2013fc, a bright type II supernova (SN) in a circumnuclear star-forming ring in the luminous infrared galaxy ESO 154-G010, observed as part of the Public ESO Spectroscopic Survey of Transient Objects. SN 2013fc is both photometrically and spectroscopically similar to the well-studied type IIn SN 1998S and to the bright type II-L SN 1979C. It exhibits an initial linear decline, followed by a short plateau phase and a tail phase with a decline too fast for 56Co decay with full γ-ray trapping. Initially, the spectrum was blue and featureless. Later on, a strong broad (∼8000 km s−1) H α emission profile became prominent. We apply a starlight stellar population model fit to the SN location (observed when the SN had faded) to estimate a high extinction of AV = 2.9 ± 0.2 mag and an age of
10 +3 −2
10−2+3
Myr for the underlying cluster. We compare the SN to SNe 1998S and 1979C and discuss its possible progenitor star considering the similarities to these events. With a peak brightness of B = −20.46 ± 0.21 mag, SN 2013fc is 0.9 mag brighter than SN 1998S and of comparable brightness to SN 1979C. We suggest that SN 2013fc was consistent with a massive red supergiant (RSG) progenitor. Recent mass loss probably due to a strong RSG wind created the circumstellar matter illuminated through its interaction with the SN ejecta. We also observe a near-infrared excess, possibly due to newly condensed dust.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 17 Feb 2017 11:19
Last Modified: 17 Feb 2017 11:19
DOI or Identification number: 10.1093/mnras/stv2567
URI: http://researchonline.ljmu.ac.uk/id/eprint/5555

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