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We present results from adaptive optics imaging of the T Tauri triple systemobtained at the Keck and Gemini Observatories in 2015-2019. We fit the orbitalmotion of T Tau Sb relative to Sa and model the astrometric motion of theircenter of mass relative to T Tau N. Using the distance measured by Gaia, wederived dynamical masses of M_Sa = 2.05 +/- 0.14 Msun and M_Sb = 0.43 +/- 0.06Msun. The precision in the masses is expected to improve with continuedobservations that map the motion through a complete orbital period; this isparticularly important as the system approaches periastron passage in 2023.Based on published properties and recent evolutionary tracks, we estimate amass of ~ 2 Msun for T Tau N, suggesting that T Tau N is similar in mass to TTau Sa. Narrow-band infrared photometry shows that T Tau N remained relativelyconstant between late 2017 and early 2019 with an average value of K = 5.54 +/-0.07 mag. Using T Tau N to calibrate relative flux measurements since 2015, wefound that T Tau Sa varied dramatically between 7.0 to 8.8 mag in the K-bandover timescales of a few months, while T Tau Sb faded steadily from 8.5 to 11.1mag in the K-band. Over the 27 year orbital period of the T Tau S binary, bothcomponents have shown 3-4 magnitudes of variability in the K-band, relative toT Tau N.

Orbital Motion, Variability, and Masses in the T Tauri Triple System