Table B.1
Fixed and free parameters in the PLATON and SCARLET retrievals.
| Parameter | PLATON priors | SCARLET priors |
|---|---|---|
| R⋆ [R⊙] | F (0.4445) | F (0.4445) |
| Teff [K] | F (3457) | F (3457) |
| Mp [M≕] | N (8.63,1.352) | N (8.63,1.352) |
| Rp [R≕] | U (2.4,2.8) | optimizeda |
| Tp [K] | U (200,500) | U (200,1000) |
| log Pcloud [Pa] | U (0,8) | U (−3,6.98) |
| log X | U(−12, −0.522) | U (−12, −0.522) |
| NIRISS offset [ppm] | U (−200,200) | U (−250,250) |
| NRS1 offset [ppm] | U (−200,200) | U (−250,250) |
| MIRI offset [ppm] | U (−200,200) | U (−250,250) |
| Tspot [K] | U (2000,3457) | ... |
| fspot | U (0,0.2) | ... |
Notes. We retrieve log X for CH4, CO2, H2O, NH3, HCN, and CO in the baseline retrievals. DMS, DMDS, and C2H6 are added to the model depending on the test. F, U, and N indicate fixed, uniform, and normal prior distributions, respectively. The SCARLET retrievals did not fit for stellar contamination, which was previously not found to impact the atmospheric inferences for the NIRISS and NIRSpec spectrum of K2-18 b (Schmidt et al. 2025). a SCARLET fits the planet radius for each combination of atmosphere model parameters, see Sec. B.2.
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