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Angus, C. R.; Smith, M.; Sullivan, M.; Inserra, C.; Wiseman, P.; D'Andrea, C. B.; Thomas, B. P.; Nichol, R. C.; Galbany, L.; Childress, M.; Asorey, J.; Brown, P. J.; Casas, R.; Castander, F. J.; Curtin, C.; Frohmaier, C.; Glazebrook, K.; Grün, D.; Gutierrez, C.; Kessler, R.; Kim, A. G.; Lidman, C.; Macaulay, E.; Nugent, P.; Pursiainen, M.; Sako, M.; Soares-Santos, M.; Thomas, R. C.; Abbott, T. M. C.; Avila, S.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Carnero Rosell, A.; Carretero, J.; da Costa, L. N.; De Vicente, J.; Desai, S.; Diehl, H. T.; Doel, P.; Eifler, T. F.; Flaugher, B.; Fosalba, P.; Frieman, J.; Garcia-Bellido, J.; Gründl, R. A.; Gschwend, J.; Hartley, W. G.; Hollowood, D. L.; Honscheid, K.; Hoyle, B.; James, D. J.; Kühn, K.; Kuropatkin, N.; Lahav, O.; Lima, M.; Maia, M. A. G.; March, M.; Marshall, J. L.; Menanteau, F.; Miller, C. J.; Miquel, R.; Ogando, R. L. C.; Plazas, A. A.; Romer, A. K.; Sanchez, E.; Schindler, R.; Schubnell, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D. and Tucker, D. L. (2019): Superluminous supernovae from the Dark Energy Survey. In: Monthly Notices of the Royal Astronomical Society, Vol. 487, No. 2: pp. 2215-2241

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We present a sample of 21 hydrogen-free superluminous supernovae (SLSNe-I) and one hydrogen-rich SLSN (SLSN-II) detected during the five-year Dark Energy Survey (DES). These SNe, located in the redshift range 0.220 < z < 1.998, represent the largest homogeneously selected sample of SLSN events at high redshift. We present the observed g, r, i, z light curves for these SNe, which we interpolate using Gaussian processes. The resulting light curves are analysed to determine the luminosity function of SLSNe-I, and their evolutionary time-scales. The DES SLSN-I sample significantly broadens the distribution of SLSN-I light-curve properties when combined with existing samples from the literature. We fit a magnetar model to our SLSNe, and find that this model alone is unable to replicate the behaviour of many of the bolometric light curves. We search theDES SLSN-I light curves for the presence of initial peaks prior to the main light-curve peak. Using a shock breakout model, our Monte Carlo search finds that 3 of our 14 eventswith pre-max data display such initial peaks. However, 10 events showno evidence for such peaks, in some cases downto an absolutemagnitude of <-16, suggesting that such features are not ubiquitous to all SLSN-I events. We also identify a red pre-peak feature within the light curve of one SLSN, which is comparable to that observed within SN2018bsz.

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