Table 1
Parameters and associated priors for the retrieval of WASP-96b VLT/HST/Spitzer data using ARCiS.
| Name | Description | Priors |
|---|---|---|
| Parameters included for both cloud formation and clear retrievals | ||
| Rp | Planet radius | 5 σ around lit. value(a), units of RJ, flat linear prior |
| log10(gp) | Base-10 logarithm of the planet surface gravity(b) | 1 to 5 (with g given in cgs units) |
| C/O | Atmospheric carbon-to-oxygen ratio | 0.1 (sub-solar) to 1.3 (super-solar), flat linear prior |
| N/O | Atmospheric nitrogen-to-oxygen ratio | 0 (sub-solar) to 0.3 (super-solar), flat linear prior |
| Si/O | Atmospheric silicon-to-oxygen ratio | 0 (sub-solar) to 0.3 (super-solar), flat linear prior |
| [Z] | Atmospheric metallicity (global) | −3 (sub-solar) to 3 (super-solar) dex, flat linear prior |
| log10(γ) | Ratio of visible to IR opacity | −2 to 2, flat log prior |
| firr | Irradiation parameter | 0 to 0.25, flat linear prior |
| log10(κIR) | Infrared opacity | −4 to 4 cm2 g−1, flat log prior |
| Tint | Temperature at an optical depth  as caused by internal heat from the planet |
10 to 3000 K, flat log prior |
| Parameters included in cloud formation retrieval only | ||
| Kzz | Cloud diffusion coefficient | 105−1012 cm2 s−1, flat log prior |
 |
Nucleation rate | 10−17−10−7 g cm−2 s−1, flat log prior |
Notes. A description of these parameters can be found in Min et al. (2020); Chubb & Min (2022). (a) Hellier et al. (2014). (b) We use a Gaussian prior on the mass based on radial velocity measurements of WASP-96b (Hellier et al. 2014). We compute the mass based on Rp and log(gp) and then place the prior on this derived parameter.
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