Table A.1
Physical and atmospheric parameters of the young planetary-mass objects and companions used to investigate the depth of the 1.62 μm methane absorption band.
| Name | Distance | Age | Separation | Mass | Teff | SpT | CH4 index | Ref. |
| (pc) | (Myr) | (au) | (MJup) | (K) | ||||
|
|
||||||||
| GJ 504 b | 17.56 ± 0.08 |
|
≃43.5 |
|
|
T | – | 1, 2 |
| AB Pic b |
|
30 | 248 ± 10 | 13−14 |
|
L0 ± 1 | 0.94 | 3, 4, 5 |
| 1RXS J1609-2105 b | 145 ± 20 | ≃5 | ≃330 |
|
1800 ± 200 |
|
0.88 | 6 |
| 2M 1207 b | 52.4 ± 1.1 | 8 | 40.8 ± 0.9 |
|
1600 ± 100 | M8−L5 | 0.89 | 7, 8, 9 |
| HN Peg B | 18.4 ± 0.3 | 300 ± 200 | 795 ± 15 | 21 ± 9 | 1130 ± 70 | T2.5 ± 0.5 | 1.09 | 10 |
| HR 8799 b | 39.4 ± 1.1 | 30 | 69.1 ± 0.2 |
|
1100 ± 100 |
|
0.77 | 11, 12 |
| 2M 0122 b | 36 ± 4 | ≃120 | 52 ± 6 | 12–14 | 1400 ± 100 | L4−L6 | 0.87 | 13 |
| Gu Psc b | 48 ± 5 | 100 | 2000 ± 200 | 9–13 | 1050 ± 50 | T3.5 ± 1 | 2.61 | 14 |
|
|
||||||||
| PSO J318.5-22 | 24.6 ± 1.4 | 21 | – |
|
|
L7 ± 1 | 0.88 | 15 |
| WISE 174102.78-464225 | 10–30 | 10–100 | – | 4–21 | 1450 ± 100 | L7 ± 2 | 0.85 | 16 |
| CFBDSIR 2149-0403 | 35–50 | ≃120 | – | 4–7 | ≃700 | T7−T7.5 | 5.45 | 17 |
Notes. Separations is given in projection unless the inclination of the system is known. The mass from HR 8799 b is based on spectrophotometry to be consistent with other works. Mass based on dynamical stability is always lower. The separation of HR 8799 b is the one derived from the latest orbital fit. We adopted the lowest solution in mass for 2M0122 b, but there is another solution at 23–27 MJup. The typical uncertainty on the CH4 index is 10%.
Reference. (1) Kuzuhara et al. (2013); (2) Janson et al. (2013); (3) Chauvin et al. (2005); (4) Bonnefoy et al. (2010); (5) Bonnefoy et al. (2014); (6) Lafrenière et al. (2010); (7) Ducourant et al. (2008); (8) Chauvin et al. (2004); (9) Patience et al. (2010); (10) Luhman et al. (2007); (11) Marois et al. (2008); (12) Barman et al. (2011); (13) Bowler et al. (2013); (14) Naud et al. (2014); (15) Liu et al. (2013); (16) Schneider et al. (2014); (17) Delorme et al. (2013).
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