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Table 2
Atmosphere parameters used in our petitRADTRANS simulation.
| Parameter | HR8799 b (a) | HR8799 c, d, e (b) | GJ504 b (c) |
|---|---|---|---|
| Rplanet [RJ] | 1.2 | 1.3 | 1.0 |
| Distance [pc] | 41 | 41 | 17.5 |
| log(g) [cgs] | 4.0 | 4.0 | 3.9 |
| Teff [K] | 1100 | 1200 | 550 |
| Fe/H [dex] (*) | 0.2 | 0.2 | 0.2 |
| C/O [dex] (*) | 0.4 | 0.4 | 0.4 |
| Molecule | log(Xmol) | ||
| H2O | −2.1 | −2.2 | −2.0 |
| CO | −2.8 | −2.3 | <−10 |
| CH4 | −2.4 | −2.7 | −2.3 |
| NH3 | −5.0 | −5.3 | −2.9 |
| H2S | −3.3 | −3.3 | −3.3 |
| PH3 | −5.0 | −5.1 | −8.0 |
| CO2 | −5.3 | −5.0 | <−10 |
Notes. (*) The parameters of Fe/H and C/O were kept constant in order to have a more comparable atmosphere chemistry.
References. (a) Wang et al. (2018). (b)Wang et al. (2020). (c)Bonnefoy et al. (2018).
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