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We report on the discovery of Swift J004516.6-734703, a Be/X-ray binarysystem by the Swift SMC Survey, S-CUBED. Swift J004516.6-734703, or SXP 146.6,was found to be exhibiting a bright (~10^37 erg/s) X-ray outburst in 2020 June18. The historical UV and IR light-curves from OGLE and Swift/UVOT showed thatafter a long period of steady brightness, it experienced a significantbrightening beginning around 2019 March. This IR/UV rise is likely thesignature of the formation of a circumstellar disc, confirmed by the presenceof strong a H{\alpha} line in SALT spectroscopy, that was not previouslypresent. Periodicity analysis of the OGLE data reveals a plausible 426 daybinary period, and in the X-ray a pulsation period of 146.6s period isdetected. The onset of X-ray emission from Swift J004516.6-734703 is likely thesignature of a Type-I outburst from the first periastron passage of the neutronstar companion through the newly formed circumstellar disc. We note that theformation of the circumstellar disc began at the predicted time of the previousperiastron passage, suggesting its formation was spurred by tidal interactionwith the neutron star.

The newly discovered Be/X-ray binary Swift J004516.6-734703 in the SMC: witnessing the emergence of a circumstellar disc