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Understanding the extreme luminosity of DES14X2fna

Understanding the extreme luminosity of DES14X2fna
Understanding the extreme luminosity of DES14X2fna
We present DES14X2fna, a high-luminosity, fast-declining Type IIb supernova (SN IIb) at redshift z = 0.0453, detected by the Dark Energy Survey (DES). DES14X2fna is an unusual member of its class, with a light curve showing a broad, luminous peak reaching Mr ≃ -19.3 mag 20 d after explosion. This object does not show a linear decline tail in the light curve until ≃60 d after explosion, after which it declines very rapidly (4.30 ± 0.10 mag 100 d-1 in the r band). By fitting semi-analytic models to the photometry of DES14X2fna, we find that its light curve cannot be explained by a standard 56Ni decay model as this is unable to fit the peak and fast tail decline observed. Inclusion of either interaction with surrounding circumstellar material or a rapidly-rotating neutron star (magnetar) significantly increases the quality of the model fit. We also investigate the possibility for an object similar to DES14X2fna to act as a contaminant in photometric samples of SNe Ia for cosmology, finding that a similar simulated object is misclassified by a recurrent neural network (RNN)-based photometric classifier as an SN Ia in ~1.1-2.4 per cent of cases in DES, depending on the probability threshold used for a positive classification.
supernovae: general, supernovae: individual: DES14X2fna
1365-2966
3950-3967
Grayling, M.
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Gutiérrez, C. P.
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Sullivan, M.
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Wiseman, P.
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Vincenzi, M.
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González-Gaitán, S.
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Lidman, C.
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Swann, E.
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Frohmaier, C.
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Möller, A.
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Bhargava, S.
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Carretero, J.
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Costanzi, M.
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da Costa, L. N.
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De Vicente, J.
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Desai, S.
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Everett, S.
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Ferrero, I.
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Fosalba, P.
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Frieman, J.
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García-Bellido, J.
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Gaztanaga, E.
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Gruen, D.
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Gruendl, R. A.
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Gschwend, J.
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Gutierrez, G.
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Hoyle, B.
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Kuehn, K.
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Kuropatkin, N.
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Lima, M.
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MacCrann, N.
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Martini, P.
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Miquel, R.
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Palmese, A.
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Paz-Chinchón, F.
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Plazas, A. A.
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The Dark Energy Survey Collaboration
Grayling, M.
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Gutiérrez, C. P.
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Sullivan, M.
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Wiseman, P.
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Vincenzi, M.
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González-Gaitán, S.
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Tucker, B. E.
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Galbany, L.
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Kelsey, L.
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Lidman, C.
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Swann, E.
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Frohmaier, C.
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Carollo, D.
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Glazebrook, K.
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Möller, A.
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Hinton, S. R.
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Uddin, S. A.
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Aguena, M.
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Avila, S.
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Bertin, E.
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Bhargava, S.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Carretero, J.
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Costanzi, M.
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da Costa, L. N.
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De Vicente, J.
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Desai, S.
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Diehl, H. T.
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Doel, P.
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Everett, S.
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Ferrero, I.
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Fosalba, P.
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Frieman, J.
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García-Bellido, J.
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Gaztanaga, E.
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Gruen, D.
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Gruendl, R. A.
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Gschwend, J.
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Gutierrez, G.
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Hoyle, B.
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Kuehn, K.
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Kuropatkin, N.
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Lima, M.
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MacCrann, N.
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Martini, P.
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Miquel, R.
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Palmese, A.
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Paz-Chinchón, F.
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Plazas, A. A.
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The Dark Energy Survey Collaboration (2021) Understanding the extreme luminosity of DES14X2fna. Monthly Notices of the Royal Astronomical Society, 505 (3), 3950-3967. (doi:10.1093/mnras/stab1478).

Record type: Article

Abstract

We present DES14X2fna, a high-luminosity, fast-declining Type IIb supernova (SN IIb) at redshift z = 0.0453, detected by the Dark Energy Survey (DES). DES14X2fna is an unusual member of its class, with a light curve showing a broad, luminous peak reaching Mr ≃ -19.3 mag 20 d after explosion. This object does not show a linear decline tail in the light curve until ≃60 d after explosion, after which it declines very rapidly (4.30 ± 0.10 mag 100 d-1 in the r band). By fitting semi-analytic models to the photometry of DES14X2fna, we find that its light curve cannot be explained by a standard 56Ni decay model as this is unable to fit the peak and fast tail decline observed. Inclusion of either interaction with surrounding circumstellar material or a rapidly-rotating neutron star (magnetar) significantly increases the quality of the model fit. We also investigate the possibility for an object similar to DES14X2fna to act as a contaminant in photometric samples of SNe Ia for cosmology, finding that a similar simulated object is misclassified by a recurrent neural network (RNN)-based photometric classifier as an SN Ia in ~1.1-2.4 per cent of cases in DES, depending on the probability threshold used for a positive classification.

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Accepted/In Press date: 18 May 2021
e-pub ahead of print date: 24 May 2021
Published date: 1 August 2021
Keywords: supernovae: general, supernovae: individual: DES14X2fna

Identifiers

Local EPrints ID: 457726
URI: http://eprints.soton.ac.uk/id/eprint/457726
ISSN: 1365-2966
PURE UUID: fd478bb7-0028-4968-96a2-bcc7beea1e93
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512

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Date deposited: 16 Jun 2022 00:26
Last modified: 28 Feb 2024 03:01

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Contributors

Author: M. Grayling
Author: C. P. Gutiérrez
Author: M. Sullivan ORCID iD
Author: P. Wiseman ORCID iD
Author: M. Vincenzi
Author: S. González-Gaitán
Author: B. E. Tucker
Author: L. Galbany
Author: L. Kelsey
Author: C. Lidman
Author: E. Swann
Author: C. Frohmaier
Author: D. Carollo
Author: K. Glazebrook
Author: A. Möller
Author: S. R. Hinton
Author: S. A. Uddin
Author: M. Aguena
Author: S. Avila
Author: E. Bertin
Author: S. Bhargava
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: M. Costanzi
Author: L. N. da Costa
Author: J. De Vicente
Author: S. Desai
Author: H. T. Diehl
Author: P. Doel
Author: S. Everett
Author: I. Ferrero
Author: P. Fosalba
Author: J. Frieman
Author: J. García-Bellido
Author: E. Gaztanaga
Author: D. Gruen
Author: R. A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: B. Hoyle
Author: K. Kuehn
Author: N. Kuropatkin
Author: M. Lima
Author: N. MacCrann
Author: P. Martini
Author: R. Miquel
Author: A. Palmese
Author: F. Paz-Chinchón
Author: A. A. Plazas
Corporate Author: The Dark Energy Survey Collaboration

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