2016A&A...587A..35K

We present new astrometric measurements of the components in the T Tauri system and derive new orbits and masses. T Tauri was observed during the science verification time of the new extreme adaptive optics facility SPHERE at the VLT. We combine the new positions with recalibrated NACO-measurements and data from the literature. Model fits for the orbits of T Tau Sa and Sb around each other and around T Tau N yield orbital elements and individual masses of the stars Sa and Sb. Our new orbit for T Tau Sa/Sb is in good agreement with other recent results, which indicates that enough of the orbit has been observed for a reliable fit. The total mass of T Tau S is 2.65±0.11M_☉. The mass ratio M_Sb:M_Sa is 0.25±0.03, which yields individual masses of M_Sa=2.12±0.10M_☉ and M_Sb=0.53±0.06M_☉. If our current knowledge of the orbital motions is used to compute the position of the southern radio source in the T Tauri system, then we find no evidence of the proposed dramatic change in its path.