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Table A.1.
Parameters of star and planets used for the simulation with VPLanet for K2-18 and K2-18b.
| Parameter | Value |
|---|---|
| Stellar Mass (M⊙) | 0.413 |
| Initial Rotation Period (days) | 1.0 |
| Planet’s Mass (M⊕) | 8.0 |
| Planet Mass-Radius Model | Lehmer17* / NONE |
| Planet’s Radius (present-day) (R⊕) | 2.38 |
| Planet’s Eccentricity | 0.2 |
| Planet’s Semi-major axis (AU) | 0.143 |
| Envelope mass (M⊕) | 0.06 |
| Thermosphere temperature (K) | 400 |
| Saturated XUV luminosity fraction | 10−3 |
| Initial Age (Myr) | 5.0 |
| Flare Energy (erg) | 1033 to 1036 |
Notes. Reference *Lehmer & Catling (2017)
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