Table 3
Parameters used to generate the petitRADTRANS templates.
| For all templates | ||||
|---|---|---|---|---|
| Parameter | Units | Value | ||
| Wavelength range | μm | 1.8–2.7 | ||
| Pressure range | bar | 1–10−10 | ||
| Eq. temperatureW | Teq (K) | 738 | ||
| Int. temperatureS | Tint (K) | 460 | ||
| Planet radiusW | Rp (RJ) | 0.94 | ||
| GravityW | g (cm/s2) | 102.45 ≈ 282 | ||
| Reference pressureD | P0 (bar) | 0.01 | ||
| Atmospheric IR opacityD | κIR (cm2/g) | 0.01 | ||
| Ratio of optical and IR opacityD | γ | 0.4 | ||
| Non-metallic mass fractionsD | H:He | 0.72:0.28 | ||
| Rayleigh species | H2, He | |||
| Continuum opacities | H2–H2, H2–He | |||
| Convolved spec. resolution | R | 140 000 | ||
| Per retrieval | ||||
| Parameter | Units | Line list | CHI | Aur |
| Mean mol. weight* | u | 3.02 | 2.64 | |
| VMR per species:** | (dex) | |||
| CH4 | HITEMP (2020) | −5.8 | −6.1 | |
| CO | HITEMP (2010) | −1.9 | −3.0 | |
| CO2 | HITEMP (2010) | −3.9 | −4.4 | |
| H2O | ExoMol (2018) | −2.1 | −2.6 | |
| H2S | HITRAN (2013) | −8.5 | −8.6 | |
| NH3 | ExoMol (2011) | −5.0 | −5.1 | |
| †SO2 | −5.2 | −5.7 | ||
Notes. Superscripts D, S, W correspond to values taken from Dyrek et al. (2024), Sing et al. (2024), and Welbanks et al. (2024) respectively. *The mean molecular weight (MMW), denoted by μ and as calculated in Eq. (4), is given here for the atmosphere when considering the presence of all species. **The values rV cited here for VMRs are given in dex, i.e. as log10(rV) for each species. These values are taken from the Extended Data Table 2 columns for CHIMERA (CHI) and Aurora (Aur) of Welbanks et al. (2024), as indicated, and were originally published with errors. However, we do not include these errors here, as our templates are generated without uncertainties. † The published VMR for SO2 was accounted for in our generation of templates insofar as its weight was included in our calculation of MMW, but this species is not part of our analysis, as it does not have features present in our wavelength range.
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