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We report the discovery of the likely white dwarf companions to radiomillisecond pulsars 47 Tuc Q and 47 Tuc S in the globular cluster 47 Tucanae.These blue stars were found in near-ultraviolet images from the Hubble SpaceTelescope for which we derived accurate absolute astrometry, and are located atpositions consistent with the radio coordinates to within 0.016 arcsec(0.2sigma). We present near-ultraviolet and optical colours for the previouslyidentified companion to millisecond pulsar 47 Tuc U, and we unambiguouslyconfirm the tentative prior identifications of the optical counterparts to 47Tuc T and 47 Tuc Y. For the latter, we present its radio-timing solution forthe first time. We find that all five near-ultraviolet counterparts haveU300-B390 colours that are consistent with He white dwarf cooling models formasses ~0.16-0.3 Msun and cooling ages within ~0.1-6 Gyr. The Ha-R625 coloursof 47 Tuc U and 47 Tuc T indicate the presence of a strong Ha absorption line,as expected for white dwarfs with an H envelope.

Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae