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There are no field brown dwarf analogs with measured masses, radii, andluminosities, precluding our ability to connect the population of transitingbrown dwarfs with measurable masses and radii and field brown dwarfs withmeasurable luminosities and atmospheric properties. LHS 6343 C, aweakly-irradiated brown dwarf transiting one member of an M+M binary in theKepler field, provides the first opportunity to probe the atmosphere of anon-inflated brown dwarf with a measured mass and radius. Here, we analyze fourSpitzer observations of secondary eclipses of LHS 6343 C behind LHS 6343 A.Jointly fitting the eclipses with a Gaussian process noise model of theinstrumental systematics, we measure eclipse depths of 1.06 \pm 0.21 ppt at 3.6microns and 2.09 \pm 0.08 ppt at 4.5 microns, corresponding to brightnesstemperatures of 1026 \pm 57 K and 1249 \pm 36 K, respectively. We then applybrown dwarf evolutionary models to infer a bolometric luminosity log(L_star /L_sun) = -5.16 \pm 0.04. Given the known physical properties of the brown dwarfand the two M dwarfs in the LHS 6343 C system, these depths are consistent withmodels of a 1100 K T dwarf at an age of 5 Gyr and empirical observations offield T5-6 dwarfs with temperatures of 1070 \pm 130 K. We investigate thepossibility that the orbit of LHS 6343 C has been altered by the Kozai-Lidovmechanism and propose additional astrometric or Rossiter-McLaughlinmeasurements of the system to probe the dynamical history of the system.

Benchmark Transiting Brown Dwarf LHS 6343 C: Spitzer Secondary Eclipse Observations Yield Brightness Temperature and mid-T Spectral Class