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Table 3

Spectral indices for WISE J0720, defined by McLean et al. (2003) and measured on our low-resolution FIRE spectrum.

Index Value Sp. type Index Value Sp. type

H2OA 0.66 ± 0.01 L1 ± 1.5 H2OD 1.02 ± 0.01 M9 ± 1
H2OB 0.77 ± 0.01 L2 ± 1 JFeH 0.90 ± 0.01 M8 ± 2
H2OC 0.68 ± 0.01 L2 ± 2 zFeH 0.76 ± 0.04 M7 ± 2

Notes. The derived spectral types from the spectral sequences in McLean et al. (2003) are listed. The methane indices were omitted, because they cannot constrain the spectral type of M- or L-type objects, and the CO index was omitted because it is in an unreliable part of the spectrum.

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