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We present the JHKs light curves for the double-lined eclipsing binary 2MASSJ05352184-0546085, in which both components are brown dwarfs. We analyze theselight curves with the published Ic-band light curve and radial velocities toprovide refined measurements of the system's physical parameters. The componentmasses and radii are here determined with an accuracy of ~6.5% and ~1.5%,respectively. We confirm the previous surprising finding that the primary browndwarf has a cooler effective temperature than its companion. Next, we perform adetailed study of the variations in the out-of-eclipse phases of the lightcurves to ascertain the properties of any inhomogeneities on the surfaces ofthe brown dwarfs. Our analysis reveals two low-amplitude periodic signals, oneattributable to the rotation of the primary (with a period of 3.293+/-0.001 d)and the other to that of the secondary (14.05+/-0.05 d). Finally, we explorethe effects on the derived physical parameters of the system when spots areincluded in the modeling. The observed low-amplitude rotational modulations arewell fit by cool spots covering a small fraction of their surfaces. To mimicthe observed ~200 K suppression of the primary's temperature, our modelrequires that the primary possess a very large spot coverage fraction of ~65%.Altogether, a spot configuration in which the primary is heavily spotted whilethe secondary is lightly spotted can explain the apparent temperature reversaland can bring the temperatures of the brown dwarfs into agreement with thepredictions of theoretical models.

Near-Infrared Light Curves of the Brown Dwarf Eclipsing Binary 2MASS J05352184-0546085: Can Spots Explain the Temperature Reversal?