Table 3
Scenarios to model the atmospheric spectra.
| Scenario | Description | Insolation |  (bar) |
 (bar) |
 |
|---|---|---|---|---|---|
| Dry 1 | Biotic, 3 Gyr | 1481.2 W m−2 | 1.366 · 10−1 bar | 4.333 · 10−2 bar | ~10−6 (a) |
| Moist 1 | Biotic, 3 Gyr | 1481.2 W m−2 | 1.366 · 10−1 bar | 4.333 · 10−2 bar | 10−1 − 10−5 (a) |
| Dry 2 | Biotic, 4 Gyr | 1602.2 W m−2 | 1.186 · 10−1 bar | 4.968 · 10−2 bar | ~10−6 (a) |
| Moist 2 | Biotic, 4 Gyr | 1602.2 W m−2 | 1.186 · 10−1 bar | 4.968 · 10−2 bar | 10−1 − 10−5 (a) |
| Steam 3 | Abiotic, 3 Gyr | 1481.2 W m−2 | 2.082 · 10−1 bar | 3.755 · 10−1 bar | 23.7% |
| Steam 4 | Abiotic, 4 Gyr | 1602.2 W m−2 | 8.513 bar | 2.715 · 102 bar | 96.6% |
| Desiccated 4 | Abiotic, 4 Gyr | 1602.2 W m−2 | 8.513 bar | 0 bar | 0% |
Notes. 
is the water volume mixing ratio. (a)H2O abundances in the atmosphere are modified by the assumed hydrological cycle. We note that the atmosphere model 1D TERRA starts 0.5 km above the modelling domain of the geophysical model (see Appendix E). For all scenarios, we assumed an oxygen fugacity of IW-0.2 and an orbital distance of 0.9 AU from a Sun-like star. We assumed a background gas for all models of 1 bar N2 and for the biotic model runs additionally 0.2 bar O2.
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