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We show that by appealing to a Quark-Nova (the explosive transition of aneutron star to a quark star) occurring in an He-HMXB system we can account forthe lightcurve of the first superluminous SN, DES13S2cmm, discovered by theDark-Energy Survey. The neutron star's explosive conversion is triggered as aresult of accretion during the He-HMXB second Common Envelope phase. The dense,relativistic, Quark-Nova ejecta in turn energizes the extended He-rich CommonEnvelope in an inside-out shock heating process. We find an excellent fit(reduced chi^2 of 1.09) to the bolometric light-curve of SN DES13S2cmmincluding the late time emission, which we attribute to Black Hole accretionfollowing the conversion of the Quark Star to a Black hole.

The superluminous SN DES13S2cmm as a signature of a Quark-Nova in a He-HMXB system