Interacting supernovae and supernova impostors. SN 2007sv: the major eruption of a massive star in UGC 5979

Journal
Date Issued
2015
Author(s)
•
•
Taubenberger, S.
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•
Maund, J. R.
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•
Boles, T.
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•
Duszanowicz, G.
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•
Harutyunyan, A.
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Hermansson, L.
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Höflich, P.
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Maguire, K.
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Navasardyan, H.
•
Smartt, S. J.
•
Taddia, F.
•
DOI
Description
This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We acknowledge the usage of the HyperLeda database ( http://leda.univ-lyon1.fr ). Based on observations made with: The Cima Ekar 1.82 m telescope of the INAF-Astronomical Observatory of Padua, Italy. The Liverpool Telescope operated on the island of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias with financial support from the UK Science and Technology Facilities Council. The NOT, operated by the NOT Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. The WHT operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofsica de Canarias. The Italian TNG operated on the island of La Palma by the Fundacion Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The HET, joint project of the University of Texas at Austin, Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen. The Calar Alto 2.2 m telescope operated at the CAHA at Calar Alto, owned and operated jointly by the Max-Planck-Institut für Astronomie in Heidelberg, Germany, and the Instituto de Astrofisica de Andalucia in Granada, Spain. We thank P. Corelli (Mandi observatory, Pagnacco, UD, Italy) for the observations of (SN) 2007sv. Based also on observations performed at the NOT (Proposal number 49-016, PI: F. Taddia), La Palma, Spain. This work is part of the European supernova collaboration involved in the ESO-NTT large programme 184.D-1140 led by Stefano Benetti. LT, AP, SB, EC, AH and MT are partially supported by the PRIN-INAF 2011 with the project ‘Transient Universe: from ESO Large to PESSTO’. NER is supported by the MICINN grant AYA2011-24704/ESP, by the ESF EUROCORES Program EuroGENESIS (MICINN grant EUI2009-04170), by SGR grants of the Generalitat de Catalunya, and by EU-FEDER funds. NER also acknowledges the support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 267251. ST acknowledges support by TRR 33 ‘The Dark Universe’ of the German Research Foundation (DFG). The research of JRM is supported through a Royal Society Research Fellowship. The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant agreement no. [291222]
Abstract
We report the results of the photometric and spectroscopic monitoring campaign of the transient SN 2007sv. The observables are similar to those of Type IIn supernovae, a well-known class of objects whose ejecta interact with pre-existing circumstellar material (CSM). The spectra show a blue continuum at early phases and prominent Balmer lines in emission; however, the absolute magnitude at the discovery of SN 2007sv (MR = -14.25 ± 0.38) indicate it to be most likely a supernova impostor. This classification is also supported by the lack of evidence in the spectra of very high velocity material as expected in supernova ejecta. In addition, we find no unequivocal evidence of broad lines of α- and/or Fe-peak elements. The comparison with the absolute light curves of other interacting objects (including Type IIn supernovae) highlights the overall similarity with the prototypical impostor SN 1997bs. This supports our claim that SN 2007sv was not a genuine supernova, and was instead a supernova impostor, most likely similar to the major eruption of a luminous blue variable.
Volume
447
Issue
1
Start page
117
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.447..117T
Rights
open.access
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