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Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star

Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star
Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star
We report photometric and spectroscopic observations of the optical transient LSQ13zm. Historical data reveal the presence of an eruptive episode (that we label as ‘2013a’) followed by a much brighter outburst (‘2013b’) three weeks later, that we argue to be the genuine supernova explosion. This sequence of events closely resemble those observed for SN 2010mc and (in 2012) SN 2009ip. The absolute magnitude reached by LSQ13zm during 2013a (MR = ?14.87 ± 0.25?mag) is comparable with those of supernova impostors, while that of the 2013b event (MR = ?18.46 ± 0.21?mag) is consistent with those of interacting supernovae. Our spectra reveal the presence of a dense and structured circumstellar medium, probably produced through numerous pre-supernova mass-loss events. In addition, we find evidence for high-velocity ejecta, with a fraction of gas expelled at more than 20 000?km s?1. The spectra of LSQ13zm show remarkable similarity with those of well-studied core-collapse supernovae. From the analysis of the available photometric and spectroscopic data, we conclude that we first observed the last event of an eruptive sequence from a massive star, likely a Luminous Blue Variable, which a short time later exploded as a core-collapse supernova. The detailed analysis of archival images suggest that the host galaxy is a star-forming Blue Dwarf Compact Galaxy.
0035-8711
1039-1059
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Pastorello, A.
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Barbieri, M.
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Mattila, S.
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Morales-Garoffolo, A
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Ochner, P.
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Tartaglia, L.
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Gal-Yam, A.
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Schulze, S.
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Fasano, G.
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Barbieri, M.
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Kankare, E.
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Mattila, S.
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Morales-Garoffolo, A
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Ochner, P.
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Rebbapragada, Umaa D.
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Terreran, G.
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Tomasella, L.
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Turatto, M.
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Verroi, E.
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Woźniak, P.R.
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Tartaglia, L., Pastorello, A., Sullivan, M., Baltay, C., Rabinowitz, D., Nugent, P., Drake, A.J., Djorgovski, S.G., Gal-Yam, A., Fabrika, S., Barsukova, E.A., Goranskij, V.P., Valeev, A.F., Fatkhullin, T., Schulze, S., Mehner, A., Bauer, F.E., Taubenberger, S., Nordin, J., Valenti, S., Howell, D.A., Benetti, S., Cappellaro, E., Fasano, G., Elias-Rosa, N., Barbieri, M., Bettoni, D., Harutyunyan, A., Kangas, T., Kankare, E., Martin, J.C., Mattila, S., Morales-Garoffolo, A, Ochner, P., Rebbapragada, Umaa D., Terreran, G., Tomasella, L., Turatto, M., Verroi, E. and Woźniak, P.R. (2016) Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star. Monthly Notices of the Royal Astronomical Society, 459 (1), 1039-1059. (doi:10.1093/mnras/stw675).

Record type: Article

Abstract

We report photometric and spectroscopic observations of the optical transient LSQ13zm. Historical data reveal the presence of an eruptive episode (that we label as ‘2013a’) followed by a much brighter outburst (‘2013b’) three weeks later, that we argue to be the genuine supernova explosion. This sequence of events closely resemble those observed for SN 2010mc and (in 2012) SN 2009ip. The absolute magnitude reached by LSQ13zm during 2013a (MR = ?14.87 ± 0.25?mag) is comparable with those of supernova impostors, while that of the 2013b event (MR = ?18.46 ± 0.21?mag) is consistent with those of interacting supernovae. Our spectra reveal the presence of a dense and structured circumstellar medium, probably produced through numerous pre-supernova mass-loss events. In addition, we find evidence for high-velocity ejecta, with a fraction of gas expelled at more than 20 000?km s?1. The spectra of LSQ13zm show remarkable similarity with those of well-studied core-collapse supernovae. From the analysis of the available photometric and spectroscopic data, we conclude that we first observed the last event of an eruptive sequence from a massive star, likely a Luminous Blue Variable, which a short time later exploded as a core-collapse supernova. The detailed analysis of archival images suggest that the host galaxy is a star-forming Blue Dwarf Compact Galaxy.

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1604.00013v1.pdf - Accepted Manuscript
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Accepted/In Press date: 18 March 2016
e-pub ahead of print date: 23 March 2016
Published date: 11 June 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 394633
URI: https://eprints.soton.ac.uk/id/eprint/394633
ISSN: 0035-8711
PURE UUID: 441b93df-11be-4e50-ad4e-7d39c35499bc
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 23 May 2016 08:29
Last modified: 06 Jun 2018 12:27

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Contributors

Author: L. Tartaglia
Author: A. Pastorello
Author: M. Sullivan ORCID iD
Author: C. Baltay
Author: D. Rabinowitz
Author: P. Nugent
Author: A.J. Drake
Author: S.G. Djorgovski
Author: A. Gal-Yam
Author: S. Fabrika
Author: E.A. Barsukova
Author: V.P. Goranskij
Author: A.F. Valeev
Author: T. Fatkhullin
Author: S. Schulze
Author: A. Mehner
Author: F.E. Bauer
Author: S. Taubenberger
Author: J. Nordin
Author: S. Valenti
Author: D.A. Howell
Author: S. Benetti
Author: E. Cappellaro
Author: G. Fasano
Author: N. Elias-Rosa
Author: M. Barbieri
Author: D. Bettoni
Author: A. Harutyunyan
Author: T. Kangas
Author: E. Kankare
Author: J.C. Martin
Author: S. Mattila
Author: A Morales-Garoffolo
Author: P. Ochner
Author: Umaa D. Rebbapragada
Author: G. Terreran
Author: L. Tomasella
Author: M. Turatto
Author: E. Verroi
Author: P.R. Woźniak

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