Table 2
Stellar, planetary, and stellar wind parameters used in all simulations.
| Parameter | Value |
|---|---|
| Planet’s mass Mpl (kg) | 5.97 × 1024 |
| Planet’s radius Rpl (m) | 6.371 × 106 |
| HZ distance dHZ (AU) | 0.12 −0.36 |
| Orbital distance dorb, (AU) | 0.24 |
| Electron impact ionizaion rate (N) τei (s−1) | 6.3 × 10−6 |
| Electron impact ionizaion rate (H) τei (s−1) | 1.0 × 10−5 |
| SW number density nsw (m−3) | 2.5 × 108 |
| SW velocity vsw (m s−1) | 330 × 103 |
| SW temperature Tsw, (K) | 2 × 106 |
| Charge exchange crossection H+–H (m2) | 2.0 × 10−19 |
| Charge exchange crossection H+–N (m2) | 1.0 × 10−19 |
| H–H elastic collision crossection (m2) | 3.5 × 10−20 |
| H–N elastic collision crossection (m2) | 3.7 × 10−20 |
| H–N elastic collision crossection (m2) | 3.9 × 10−20 |
Notes. Stellar wind and habitable zone parameters of GJ436 have been adopted from Kislyakova et al. (2013), electron impact ionization rates were calculated using the NIST databases. Charge exchange cross sections are from Lindsay & Stebbings (2005) for H+ –H and Rinaldi et al. (2011) for N+–H. Elastic collision crossections were calculated as described in Sect. 2.2.
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