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The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system

The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system
The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system
We present and analyse an extensive dataset of the superluminous supernova (SLSN) LSQ14mo (z = 0.256), consisting of a multi-colour light curve from −30 d to +70 d in the rest-frame (relative to maximum light) and a series of six spectra from PESSTO covering −7 d to +50 d. This is among the densest spectroscopic coverage, and best-constrained rising light curve, for a fast-declining hydrogen-poor SLSN. The bolometric light curve can be reproduced with a millisecond magnetar model with ~ 4 M⊙ ejecta mass, and the temperature and velocity evolution is also suggestive of a magnetar as the power source. Spectral modelling indicates that the SN ejected ~ 6 M⊙ of CO-rich material with a kinetic energy of ~7 × 1051 erg, and suggests a partially thermalised additional source of luminosity between −2 d and +22 d. This may be due to interaction with a shell of material originating from pre-explosion mass loss. We further present a detailed analysis of the host galaxy system of LSQ14mo. PESSTO and GROND imaging show three spatially resolved bright regions, and we used the VLT and FORS2 to obtain a deep (five-hour exposure) spectra of the SN position and the three star-forming regions, which are at a similar redshift. The FORS2 spectrum at + 300 days shows no trace of SN emission lines and we place limits on the strength of [O i] from comparisons with other Ic supernovae. The deep spectra provides a unique chance to investigate spatial variations in the host star-formation activity and metallicity. The specific star-formation rate is similar in all three components,as is the presence of a young stellar population. However, the position of LSQ14mo exhibits a lower metallicity, with 12 + log (O/H) = 8.2 in both the R23 and N2 scales (corresponding to ~0.3 Z⊙ ). We propose that the three bright regions in the host system are interacting, which could induce gas flows triggering star formation in low-metallicity regions.
supernovae: general, supernovae: individual: LSQ14mo, galaxies: abundances, galaxies: dwarf, galaxies: interactions
0004-6361
1-22
Chen, T.-W.
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Nicholl, M.
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Smartt, S.J.
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Mazzali, P.A.
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Yates, R.M.
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Moriya, T.J.
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Inserra, C.
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Langer, N.
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Krühler, T.
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Pan, Y.-C.
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Kotak, R.
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Galbany, L.
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Schady, P.
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Wiseman, P.
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Greiner, J.
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Schulze, S.
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Man, A.W.S.
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Jerkstrand, A.
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Dennefeld, M.
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Baltay, C.
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Bolmer, J.
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Kankare, E.
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Knust, F.
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Maguire, K.
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Rabinowitz, D.
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Rostami, S.
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Sullivan, M.
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Chen, T.-W.
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Nicholl, M.
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Smartt, S.J.
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Mazzali, P.A.
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Yates, R.M.
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Moriya, T.J.
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Inserra, C.
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Langer, N.
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Krühler, T.
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Pan, Y.-C.
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Kotak, R.
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Galbany, L.
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Schady, P.
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Wiseman, P.
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Greiner, J.
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Schulze, S.
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Man, A.W.S.
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Jerkstrand, A.
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Dennefeld, M.
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Baltay, C.
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Bolmer, J.
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Kankare, E.
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Knust, F.
15baf1c4-2331-4ae1-a1c7-4cffb264838a
Maguire, K.
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Rabinowitz, D.
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Rostami, S.
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Sullivan, M.
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Chen, T.-W., Nicholl, M., Smartt, S.J., Mazzali, P.A., Yates, R.M., Moriya, T.J., Inserra, C., Langer, N., Krühler, T., Pan, Y.-C., Kotak, R., Galbany, L., Schady, P., Wiseman, P., Greiner, J., Schulze, S., Man, A.W.S., Jerkstrand, A., Dennefeld, M., Baltay, C., Bolmer, J., Kankare, E., Knust, F., Maguire, K., Rabinowitz, D., Rostami, S. and Sullivan, M. (2017) The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system. Astronomy & Astrophysics, 602, 1-22. (doi:10.1051/0004-6361/201630163).

Record type: Article

Abstract

We present and analyse an extensive dataset of the superluminous supernova (SLSN) LSQ14mo (z = 0.256), consisting of a multi-colour light curve from −30 d to +70 d in the rest-frame (relative to maximum light) and a series of six spectra from PESSTO covering −7 d to +50 d. This is among the densest spectroscopic coverage, and best-constrained rising light curve, for a fast-declining hydrogen-poor SLSN. The bolometric light curve can be reproduced with a millisecond magnetar model with ~ 4 M⊙ ejecta mass, and the temperature and velocity evolution is also suggestive of a magnetar as the power source. Spectral modelling indicates that the SN ejected ~ 6 M⊙ of CO-rich material with a kinetic energy of ~7 × 1051 erg, and suggests a partially thermalised additional source of luminosity between −2 d and +22 d. This may be due to interaction with a shell of material originating from pre-explosion mass loss. We further present a detailed analysis of the host galaxy system of LSQ14mo. PESSTO and GROND imaging show three spatially resolved bright regions, and we used the VLT and FORS2 to obtain a deep (five-hour exposure) spectra of the SN position and the three star-forming regions, which are at a similar redshift. The FORS2 spectrum at + 300 days shows no trace of SN emission lines and we place limits on the strength of [O i] from comparisons with other Ic supernovae. The deep spectra provides a unique chance to investigate spatial variations in the host star-formation activity and metallicity. The specific star-formation rate is similar in all three components,as is the presence of a young stellar population. However, the position of LSQ14mo exhibits a lower metallicity, with 12 + log (O/H) = 8.2 in both the R23 and N2 scales (corresponding to ~0.3 Z⊙ ). We propose that the three bright regions in the host system are interacting, which could induce gas flows triggering star formation in low-metallicity regions.

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twc_LSQ14mo_host_0116 - Accepted Manuscript
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Accepted/In Press date: 25 January 2017
e-pub ahead of print date: 24 May 2017
Published date: June 2017
Keywords: supernovae: general, supernovae: individual: LSQ14mo, galaxies: abundances, galaxies: dwarf, galaxies: interactions

Identifiers

Local EPrints ID: 413053
URI: https://eprints.soton.ac.uk/id/eprint/413053
ISSN: 0004-6361
PURE UUID: e488aaa6-d411-4b60-a301-35a99c226195
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 14 Aug 2017 16:30
Last modified: 14 Mar 2019 01:35

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Contributors

Author: T.-W. Chen
Author: M. Nicholl
Author: S.J. Smartt
Author: P.A. Mazzali
Author: R.M. Yates
Author: T.J. Moriya
Author: C. Inserra ORCID iD
Author: N. Langer
Author: T. Krühler
Author: Y.-C. Pan
Author: R. Kotak
Author: L. Galbany
Author: P. Schady
Author: P. Wiseman
Author: J. Greiner
Author: S. Schulze
Author: A.W.S. Man
Author: A. Jerkstrand
Author: M. Dennefeld
Author: C. Baltay
Author: J. Bolmer
Author: E. Kankare
Author: F. Knust
Author: K. Maguire
Author: D. Rabinowitz
Author: S. Rostami
Author: M. Sullivan ORCID iD

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