Table 1
Stellar, planetary, and stellar wind parameters used in our test simulation for GJ 436b.
| Parameter | Value |
|---|---|
| Star mass Mst (kg) | 8.98 × 1029 |
| Star radius Rst (m) | 3.22 × 108 |
| Planet’s mass Mpl (kg) | 1.32 × 1025 |
| Planet’s radius Rpl (m) | 2.65 × 107 |
| Semi-major axis dHZ (AU) | 0.0288 |
| Inclination (°) | 85.8 |
| SW number density nsw (m−3) | 2.0 × 109 |
| SW velocity vsw (m s−1) | 110 × 103 |
| SW temperature Tsw (K) | 0.41 × 106 |
| Inner boundary radius (m) | 1.54 × 108 |
| Inner boundary density (m−3) | 2.5 × 1012 |
| Inner boundary temperature (K) | 2693 |
| Electron impact ionizaion rate (hydrogen) τei (s−1) | 5.6 × 10−5 |
| Photoionizaion rate (hydrogen) τph (s−1) | 8.8 × 10−6 |
| Bulk atmospheric outflow velocity (m s−1) | 7.9 × 103 |
| Magnetospheric obstacle substellar point Rs (m) | 1.6 × 108 |
| Magnetospheric obstacle width Rt (m) | 1.6 × 108 |
Notes. The stellar and planetary data are from www.exoplanet.eu and Bourrier et al. (2016), stellar wind parameters are adopted from Vidotto & Bourrier (2017), except of a slightly faster stellar wind speed of 110 km s−1 instead of 85 km s−1. Simulation inner boundary for the DSMC code has been adopted close to the Roche lobe at 5.83 Rpl. The parameters at the inner boundary have been calculated by the hydrodynamic code. The shift of the planet relative to the stellar center in the direction of the z-axis has been calculated according to the inclination. Assumed collision cross sections can be found in Table 2.
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