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Open Access Publications from the University of California

Superluminous supernovae from the Dark Energy Survey

  • Author(s): Angus, CR;
  • Smith, M;
  • Sullivan, M;
  • Inserra, C;
  • Wiseman, P;
  • D’Andrea, CB;
  • Thomas, BP;
  • Nichol, RC;
  • Galbany, L;
  • Childress, M;
  • Asorey, J;
  • Brown, PJ;
  • Casas, R;
  • Castander, FJ;
  • Curtin, C;
  • Frohmaier, C;
  • Glazebrook, K;
  • Gruen, D;
  • Gutierrez, C;
  • Kessler, R;
  • Kim, AG;
  • Lidman, C;
  • Macaulay, E;
  • Nugent, P;
  • Pursiainen, M;
  • Sako, M;
  • Soares-Santos, M;
  • Thomas, RC;
  • Abbott, TMC;
  • Avila, S;
  • Bertin, E;
  • Brooks, D;
  • Buckley-Geer, E;
  • Burke, DL;
  • Carnero Rosell, A;
  • Carretero, J;
  • da Costa, LN;
  • de Vicente, J;
  • Desai, S;
  • Diehl, HT;
  • Doel, P;
  • Eifler, TF;
  • Flaugher, B;
  • Fosalba, P;
  • Frieman, J;
  • García-Bellido, J;
  • Gruendl, RA;
  • Gschwend, J;
  • Hartley, WG;
  • Hollowood, DL;
  • Honscheid, K;
  • Hoyle, B;
  • James, DJ;
  • Kuehn, K;
  • Kuropatkin, N;
  • Lahav, O;
  • Lima, M;
  • Maia, MAG;
  • March, M;
  • Marshall, JL;
  • Menanteau, F;
  • Miller, CJ;
  • Miquel, R;
  • Ogando, RLC;
  • Plazas, AA;
  • Romer, AK;
  • Sanchez, E;
  • Schindler, R;
  • Schubnell, M;
  • Sobreira, F;
  • Suchyta, E;
  • Swanson, MEC;
  • Tarle, G;
  • Thomas, D;
  • Tucker, DL
  • et al.

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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 timescales. 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 the DES 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 events with pre-max data display such initial peaks. However, 10 events show no evidence for such peaks, in some cases down to an absolute magnitude 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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