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Superluminous supernovae from the dark energy survey

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, Gruen, 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, García-Bellido, J, Gruendl, R A, Gschwend, J, Hartley, W G, Hollowood, D L, Honscheid, K, Hoyle, B, James, D J, Kuehn, 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. Monthly Notices of the Royal Astronomical Society 487 (2) , pp. 2215-2241. 10.1093/mnras/stz1321

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Abstract

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 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 1 July 2019
Date of Acceptance: 30 April 2019
Last Modified: 02 Jul 2019 10:34
URI: http://orca.cf.ac.uk/id/eprint/123852

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