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We present high time‐resolution spectroscopy of the eclipsing cataclysmic variable SDSS J143317.78+101123.3 obtained with QUCAM2, a high‐speed/low‐noise electron‐multiplying CCD camera. Littlefair et al. measured the mass of the secondary star in SDSS J143317.78+101123.3 using a light‐curve fitting technique and obtained a value of   M  2 = 0.060 ± 0.003 M ⊙  , making it one of the three first bona fide detections of a brown dwarf mass donor in a cataclysmic variable. In this Letter, we present a dynamical measurement supporting this important result. We measured the radial velocity semi‐amplitude of the white dwarf from the motion of the wings of the Hα emission line and obtained a figure of   K  1 = 34 ± 4 km s −1  , in excellent agreement with the value of   K  1 = 35 ± 2 km s −1   predicted by Littlefair et al.'s model.

Radial velocity study of the post‐period minimum cataclysmic variable SDSS J143317.78+101123.3 with an electron‐multiplying CCD