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We have used Aperture Masking Interferometry and Adaptive Optics (AO) at thePalomar 200'' to obtain precise mass measurements of the binary M dwarf GJ 623.AO observations spread over 3 years combined with a decade of radial velocitymeasurements constrain all orbital parameters of the GJ 623 binary systemaccurately enough to critically challenge the models. The dynamical massesmeasured are $m_{1}=0.371\pm0.015 M_{\sun}$ (4%) and $m_{2}=0.115\pm0.0023M_{\sun}$ (2%) for the primary and the secondary respectively. Models are notconsistent with color and mass, requiring very low metallicities.Comment: 7 pages, 5 figures. Accepted for Ap

Precision Masses of the Low‐Mass Binary System GJ 623