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We report on the discovery of Swift J011511.0-725611, a rare Be X-ray binarysystem (BeXRB) with a White Dwarf (WD) compact object, in the Small MagellanicCloud (SMC) by S-CUBED, a weekly X-ray/UV survey of the SMC by the Neil GehrelsSwift Observatory. Observations show an approximately 3 month outburst fromSwift J011511.0-725611, the first detected by S-CUBED since it began in 2016June. Swift J011511.0-725611 shows super-soft X-ray emission, indicative of aWhite Dwarf compact object, which is further strengthened by the presence of an0.871 keV edge, commonly attributed to O viii K-edge in the WD atmosphere.Spectroscopy by SALT confirms the Be nature of the companion star, and longterm light-curve by OGLE finds both the signature of a circumstellar disk inthe system at outburst time, and the presence of a 17.4 day periodicity, likelythe orbital period of the system. Swift J011511.0-725611 is suggested to beundergoing a Type-II outburst, similar to the previously reported SMC Be WhiteDwarf binary (BeWD), Swift J004427.3-734801. It is likely that the rarity ofknown BeWD is in part due to the difficulty in detecting such outbursts due toboth their rarity, and their relative faintness compared to outbursts inNeutron Star BeXRBs.

Swift J011511.0-725611: Discovery of a rare Be Star / White Dwarf binary system in the SMC