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We report the detection of eclipses in GJ 3236, a bright (I = 11.6) very lowmass binary system with an orbital period of 0.77 days. Analysis of light- andradial velocity curves of the system yielded component masses of 0.38 +/- 0.02and 0.28 +/- 0.02 Msol. The central values for the stellar radii are largerthan the theoretical models predict for these masses, in agreement with theresults for existing eclipsing binaries, although the present 5% observationaluncertainties limit the significance of the larger radii to approximately 1sigma. Degeneracies in the light curve models resulting from the unknownconfiguration of surface spots on the components of GJ 3236 currently dominatethe uncertainties in the radii, and could be reduced by obtaining precise,multi-band photometry covering the full orbital period. The system appears tobe tidally synchronized and shows signs of high activity levels as expected forsuch a short orbital period, evidenced by strong Halpha emission lines in thespectra of both components. These observations probe an important region ofmass-radius parameter space around the predicted transition to fully-convectivestellar interiors, where there are a limited number of precise measurementsavailable in the literature.

GJ 3236: a new bright, very low-mass eclipsing binary system discovered by the MEarth observatory