A New Detached M Dwarf Eclipsing Binary

We describe a newly-discovered detached M-dwarf eclipsing binary system, thefourth such system known. This system was first observed by the TrES networkduring a long term photometry campaign of 54 nights. Analysis of the foldedlight curve indicates two very similar components orbiting each other with aperiod of 1.12079 +/- 0.00001 days. Spectroscopic observations with theHobby-Eberly Telescope show the system to consist of two M3e dwarfs in anear-circular orbit. Double-line radial velocity amplitudes, combined with theorbital inclination derived from light-curve fitting, yield Mass total = 0.983+/- 0.007 solar masses, with component masses M(1) = 0.493 +/- 0.003 and M(2) =0.489 +/- 0.003 solar masses. The light-curve fit yields component radii ofR(1) = 0.453 +/- 0.060 and R(2) = 0.452 +/- 0.050 solar radii. Though a preciseparallax is lacking, broadband VJHK colors and spectral typing suggestcomponent absolute magnitudes of M_V(1) = 11.18 +/- 0.30 and M_V(2) = 11.28 +/-0.30.Comment: 15 pages, 3 figure, 3 tables, accepted by ApJL, additional reference