Comparison of observed spectra for 2M2117 and theoretical models from the BT-Settle CIFIST library, as in Fig. 11, but with the best-fit model being K with logg = 4.5−0.5. The theoretical models show strong signs of degeneracy when we match them to the target, and we obtain better fits for unlikely models with much higher temperature than what is expected for the given spectral type of T0. The blue line in the upper plots depicts a lower-temperature model with Teff = 1400 K and logg = 4.0 with similar goodness-of-fit statistics as the higher-temperature best-fit model.
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