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

Journal
Date Issued
2016
Author(s)
Kangas, T.
•
Mattila, S.
•
Kankare, E.
•
Lundqvist, P.
•
Väisänen, P.
•
Childress, M.
•
Pignata, G.
•
McCully, C.
•
Valenti, S.
•
Vinkó, J.
•
•
•
Fraser, M.
•
Gal-Yam, A.
•
Kotak, R.
•
Kotilainen, J. K.
•
Smartt, S. J.
•
Galbany, L.
•
Harmanen, J.
•
Howell, D. A.
•
Inserra, C.
•
Marion, G. H.
•
Quimby, R. M.
•
Silverman, J. M.
•
Szalai, T.
•
Wheeler, J. C.
•
Ashall, C.
•
•
Romero-Cañizales, C.
•
Smith, K. W.
•
Sullivan, M.
•
Takáts, K.
•
Young, D. R.
DOI
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_{-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.
Volume
456
Issue
1
Start page
323
Uri
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.456..323K
Rights
open.access
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