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We present DES14X3taz, a new hydrogen-poor super luminous supernova (SLSN-I)discovered by the Dark Energy Survey (DES) supernova program, with additionalphotometric data provided by the Survey Using DECam for SuperluminousSupernovae (SUDSS). Spectra obtained using OSIRIS on the Gran TelescopioCANARIAS (GTC) show DES14X3taz is a SLSN-I at z=0.608. Multi-color photometryreveals a double-peaked light curve: a blue and relatively bright initial peakthat fades rapidly prior to the slower rise of the main light curve. Ourmulti-color photometry allows us, for the first time, to show that the initialpeak cools from 22,000K to 8,000K over 15 rest-frame days, and is faster andbrighter than any published core-collapse supernova, reaching 30% of thebolometric luminosity of the main peak. No physical Nickel powered model canfit this initial peak. We show that a shock-cooling model followed by amagnetar driving the second phase of the light curve can adequately explain theentire light curve of DES14X3taz. Models involving the shock-cooling ofextended circumstellar material at a distance of ~400 solar radii are preferredover the cooling of shock-heated surface layers of a stellar envelope. Wecompare DES14X3taz to the few double-peaked SLSN-I events in the literature.Although the rise-times and characteristics of these initial peaks differ,there exists the tantalizing possibility that they can be explained by onephysical interpretation.

DES14X3taz: A Type I Superluminous Supernova Showing a Luminous, Rapidly Cooling Initial Pre-Peak Bump