Two years of optical and NIR observations of the superluminous supernova UID 30901 discovered by the UltraVISTA SN survey

Emilio D. Hueichapán; Carlos Contreras V.; Regis Cartier; Paulina Lira; Paula Sanchez-Saez; Bo Milvang-Jensen; Johan P. U. Fynbo; Joseph P. Anderson; Mario Hamuy

doi:10.1093/mnras/stac1025

paper

Two years of optical and NIR observations of the superluminous supernova UID 30901 discovered by the UltraVISTA SN survey

arXiv:2204.02293 · doi:10.1093/mnras/stac1025

Abstract

We present deep optical and near-infrared photometry of UID 30901, a superluminous supernova (SLSN) discovered during the UltraVISTA survey. The observations were obtained with VIRCAM ( $Y J H K_{s}$ ) mounted on the VISTA telescope, DECam ( $g r i z$ ) on the Blanco telescope, and SUBARU Hyper Suprime-Cam (HSC; $g r i z y$ ). These multi-band observations comprise +700 days making UID 30901 one of the best photometrically followed SLSNe to date. The host galaxy of UID 30901 is detected in a deep HST F814W image with an AB magnitude of $27.3 \pm 0.2$ . While no spectra exist for the SN or its host galaxy, we perform our analysis assuming $z = 0.37$ , based on the photometric redshift of a possible host galaxy found at a projected distance of 7 kpc. Fitting a blackbody to the observations, the radius, temperature, and bolometric light curve are computed. We find a maximum bolometric luminosity of $5.4 \pm 0.34 \times 1 0^{43}$ erg s $^{- 1}$ . A flattening in the light curve beyond 600 days is observed and several possible causes are discussed. We find the observations to clearly favour a SLSN type I, and plausible power sources such as the radioactive decay of $^{56}$ Ni and the spin-down of a magnetar are compared to the data. We find that the magnetar model yields a good fit to the observations with the following parameters: a magnetic field $B = 1.4 \pm 0.3 \times 1 0^{14} G$ , spin period of $P = 6.0 \pm 0.1 m s$ and ejecta mass $M_{e j} = 11. 9_{- 6.4}^{+ 4.8} M_{⊙}$ .

arXiv comment22 pages, 15 figures, Accepted for publication in MNRAs

Two years of optical and NIR observations of the superluminous supernova UID 30901 discovered by the UltraVISTA SN survey

Abstract

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