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 | J−FeH | 0.90 ± 0.01 | M8 ± 2 |
| H2OC | 0.68 ± 0.01 | L2 ± 2 | z−FeH | 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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