Understanding the extreme luminosity of DES14X2fna

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...

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Veröffentlicht in:Mon.Not.Roy.Astron.Soc 2021-08, Vol.505 (3), p.3950-3967
Hauptverfasser: Grayling, M, Gutiérrez, C P, Sullivan, M, Wiseman, P, Vincenzi, M, González-Gaitán, S, Tucker, B E, Galbany, L, Kelsey, L, Lidman, C, Swann, E, Smith, M, Frohmaier, C, Carollo, D, Glazebrook, K, Lewis, G F, Möller, A, Hinton, S R, Uddin, S A, Abbott, T M C, Aguena, M, Avila, S, Bertin, E, Bhargava, S, Brooks, D, Carnero Rosell, A, Carrasco Kind, M, Carretero, J, Costanzi, M, da Costa, L N, De Vicente, J, Desai, S, Diehl, H T, Doel, P, Everett, S, Ferrero, I, Fosalba, P, Frieman, J, García-Bellido, J, Gaztanaga, E, Gruen, D, Gruendl, R A, Gschwend, J, Gutierrez, G, Hoyle, B, Kuehn, K, Kuropatkin, N, Lima, M, MacCrann, N, Marshall, J L, Martini, P, Miquel, R, Morgan, R, Palmese, A, Paz-Chinchón, F, Plazas, A A, Romer, A K, Sánchez, C, Sanchez, E, Scarpine, V, Serrano, S, Sevilla-Noarbe, I, Soares-Santos, M, Suchyta, E, Tarle, G, Thomas, D, To, C, Varga, T N, Walker, A R, Wilkinson, R D
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Sprache:eng
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Zusammenfassung: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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stab1478