A Surprising Dynamical Mass for V773~Tau~B
A. Boden, G. Torres, G. Duchene, Q. Konopacky, A. Ghez, R. Torres, and, L. Loinard

TL;DR
This study uses high-resolution imaging and spectroscopy to determine the dynamical mass of V773 Tau B, revealing it is likely a multiple star system with significant implications for understanding T Tauri star systems.
Contribution
The paper provides the first dynamical mass estimate for V773 Tau B, suggesting it is a multiple star system, and offers new spectroscopic insights into its nature and variability.
Findings
B's dynamical mass is 1.7-3.0 solar masses, higher than previous estimates.
B is likely a close binary of two ~1.2 solar mass PMS stars.
B exhibits high near-IR variability likely due to circumstellar material.
Abstract
We report on new high-resolution imaging and spectroscopy on the multiple T Tauri star system V773 Tau over the 2003 -- 2009 period. With these data we derive relative astrometry, photometry between the A and B components, and radial velocity (RV) of the A-subsystem components. Combining these new data with previously published astrometry and RVs, we update the relative A-B orbit model. This updated orbit model, the known system distance, and A subsystem parameters yields a dynamical mass for the B component for the first time. Remarkably the derived B dynamical mass is in the range of 1.7 -- 3.0 M. This is much higher than previous estimates, and suggests that like A, B is also a multiple stellar system. Among these data, spatially-resolved spectroscopy provide new insight into the nature of the B component. Similar to A, these near-IR spectra indicate that the dominant source…
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