Table 3
Atmospheric parameters used in the simulations for nitrogen- and hydrogen-dominated atmospheres for 3, 7, 10, and 20 XUV.
| Parameter | 3 XUV | 7 XUV | 10 XUV | 20 XUV |
|---|---|---|---|---|
| Nitrogen-dominated atmosphere with Earth-like hydrogen content | ||||
| Rib (m) | 7.4 × 106 | – | – | – |
| nib (m−3; N) | 1.2 × 1013 | |||
| nib (m−3; H) | 7.0 × 1010 | |||
| Rs (m) | 7.4 × 106 | |||
| Tib (K) | 2.2 × 103 | |||
| Nitrogen-dominated atmosphere | ||||
| Rib (m) | 7.4 × 106 | 2.15 × 107 | 2.7 × 107 | 8.6 × 107 |
| nib (m−3; N) | 1.2 × 1013 | 2.2 × 1012 | 4.6 × 1011 | 4.4 × 1011 |
| Rs (m) | 7.4 × 106 | 2.23 × 107 | 2.8 × 107 | 8.64 × 107 |
| Tib (K) | 2.2 × 103 | 7.5 × 103 | 5.0 × 103 | 2.53 × 103 |
| Hydrogen-dominated atmosphere | ||||
| Rib (m) | 4.25 × 107 | 5.65 × 107 | 6.3 × 107 | 8.2 × 107 |
| nib (m−3; H) | 2.5 × 1011 | 1.74 × 1011 | 1.54 × 1011 | 1.07 × 1011 |
| Rs (m) | 4.31 × 107 | 5.73 × 107 | 6.37 × 107 | 8.28 × 107 |
| Tib (K) | 1.14 × 103 | 2.4 × 103 | 3.04 × 103 | 4.69 × 103 |
| Species photoionization rates | ||||
| H photoion. rate (s−1) | 1.43 × 10−7 | 3.17 × 10−7 | 4.82 × 10−7 | 1.03 × 10−6 |
| N photoion. rate (s−1) | 1.15 × 10−6 | 2.14 × 10−6 | 2.97 × 10−6 | 5.43 × 10−6 |
Notes. Adopted from Tian et al. (2008; 3 and 20 XUV) and Lammer et al. (2008; 7 and 10 XUV). The value of the hydrogen density at the modern terrestrial exobase has been adopted from Kislyakova et al. (2013). The value of Rs is chosen arbitrarily slightly above the exobase. Here, Rib is the inner boundary radius, Tib is the inner boundary temperature, nib is the inner boundary number density, Rs is the obstacle standoff distance. We assume the obstacle width equal to distance to the substellar point, therefore, Rs = Rt.
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