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We report the detection of eclipses in LSPM J1112+7626, which we find to be amoderately bright (I_C = 12.14 +/- 0.05) very low-mass binary system with anorbital period of 41.03236 +/- 0.00002 days, and component masses M_1 = 0.395+/- 0.002 Msol and M_2 = 0.275 +/- 0.001 Msol in an eccentric (e = 0.239 +/-0.002) orbit. A 65 day out of eclipse modulation of approximately 2%peak-to-peak amplitude is seen in I-band, which is probably due to rotationalmodulation of photospheric spots on one of the binary components. This paperpresents the discovery and characterization of the object, including radialvelocities sufficient to determine both component masses to better than 1%precision, and a photometric solution. We find that the sum of the componentradii, which is much better-determined than the individual radii, is inflatedby 3.8 +0.9 -0.5 % compared to the theoretical model predictions, depending onthe age and metallicity assumed. These results demonstrate that thedifficulties in reproducing observed M-dwarf eclipsing binary radii withtheoretical models are not confined to systems with very short orbital periods.This object promises to be a fruitful testing ground for the hypothesized linkbetween inflated radii in M-dwarfs and activity.

LSPM J1112+7626: detection of a 41-day M-dwarf eclipsing binary from the MEarth transit survey