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The newly discovered brown-dwarf eclipsing binary 2MASS J05352184-0546085provides a unique laboratory for testing the predictions of theoretical modelsof brown-dwarf formation and evolution. The finding that the lower-mass browndwarf in this system is hotter than its higher-mass companion represents achallenge to brown-dwarf evolutionary models, none of which predict thisbehavior. Here we present updated determinations of the basic physicalproperties of 2M0535-05, bolstering the surprising reversal of temperatureswith mass in this system. We compare these measurements with widely usedbrown-dwarf evolutionary tracks, and find that the temperature reversal can beexplained by some models if the components of 2M0535-05 are mildly non-coeval,possibly consistent with dynamical simulations of brown-dwarf formation.Alternatively, a strong magnetic field on the higher-mass brown dwarf mightexplain its anomalously low surface temperature, consistent with emergingevidence that convection is suppressed in magnetically active, low-mass stars.Finally, we discuss future observational and theoretical work needed to furthercharacterize and understand this benchmark system.

A Surprising Reversal of Temperatures in the Brown-Dwarf Eclipsing Binary 2MASS J05352184-0546085