Open Access
Table 1
Physical simulation parameters
| Symbol | Value | Source | Note | |
|---|---|---|---|---|
| τ Boötis b | ||||
| Planet radius | RP | 72875 km | Wang & Ford (2011) | Theoretical |
| Orbital period | Porb | 3.31d | Butler et al. (1997); Wang & Ford (2011) | |
| Semimajor axis | a | 0.046 au | Butler et al. (1997) | |
| Atm. surface density | nn,0 | 8 × 1012 m−3 | – | |
| Atm. scale height | H | 0.06 Rp | – | 3 radial grid cells |
| Magn. flux density (eq) | BP | 455 µT | Turner et al. (2021) | Average of observations 1,2 |
| Basic Stellar wind model | ||||
| Therm. pressure | psw | 2.5 × 10−5 Pa | Nicholson et al. (2016) | |
| Ion density | nsw | 1.4 × 1012 m−3 | Nicholson et al. (2016) | |
| Velocity | υsw | 224.5 km s−1 | Nicholson et al. (2016) | Stellar frame of reference |
| Relative velocity | υ0 | 270.98 km s−1 | – |  |
| Magnetic flux density | Bsw | 2.715 µT | Nicholson et al. (2016) | |
| Alfvén Mach number | MA | 5.36 | ||
| Fast mode Mach number | Mf | 1.9 | ||
| Plasma beta | β | 8.31 | ||
Notes. Details of the stellar wind and planet model are discussed in Sects. 2.2 and 2.3.
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