Table 3
Spectral type estimation.
| Data set/index | Ref. | Spectral type |
|
|
||
| J | 1 | L0.5 ± 1.5 |
| H | 1 | L2.5 ± 0.5 |
| K | 1 | L1.0 ± 1.0 |
| Weighted averagea | L2.1 ± 0.4 | |
|
|
||
| J | 2 | L0.0 ± 1.0 |
| H | 2 | L0.0 ± 4.0 |
| K | 2 | M9.5 ± 1.5 |
| Weighted averagea | M9.9 ± 0.8 | |
|
|
||
| FeH | 3 | >L0.6b |
| H2O-1 | 3 | L0.6 ± 1.1 |
| H2O | 4 | L1.1 ± 0.8 |
| H2O-2 | 3 | L1.0 ± 1.6 |
| H2OD | 5 | M7.1 ± 0.8b |
| Weighted average | L0.9 ± 0.6 | |
Notes. Spectral types as estimated from visual inspection (top two sections) and spectral indices (bottom).
These measurements do not enter our final spectral type estimate because the FeH index does not cover the entire range of interest for HD 106906 b (valid only for M3–L3; Slesnick et al. 2004) and H2OD is based on data that are strongly affected by residuals from the telluric correction (1.96–2.08 μm; McLean et al. 2003).
Reference. (1) Allers & Liu (2013); (2) Bonnefoy et al. (2014); (3) Slesnick et al. (2004); (4) Allers et al. (2007); (5) McLean et al. (2003).
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