We report the discovery of the likely white dwarf companions to radio millisecond 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 Space Telescope for which we derived accurate absolute astrometry , and are located at positions consistent with the radio coordinates to within 0 \aas@@fstack { \prime \prime } 016 ( 0.2 \sigma ) .
We present near-ultraviolet and optical colors for the previously identified companion to millisecond pulsar 47 Tuc U , and we unambiguously confirm the tentative prior identifications of the optical counterparts to 47 Tuc T and 47 Tuc Y .
For the latter we present its radio timing solution for the first time .
We find that all five near-ultraviolet counterparts have U _ { 300 } - B _ { 390 } colors that are consistent with He white dwarf cooling models for masses \sim 0.16 - 0.3 M _ { \odot } and cooling ages between \sim 0.1 - 6 Gyr .
The H \alpha - R _ { 625 } colors of 47 Tuc U and 47 Tuc T indicate the presence of a strong H \alpha absorption line , as expected for white dwarfs with a H envelope .