Table 4
HD 189733 stellar wind and magnetosphere parameters.
| Density (cm-3) | Temperature (K) | Speed (km s-1) | BIMF (mG)a | Magnetopause nose θ angleb | |
|
|
|||||
| <5 × 107 | <4 × 106 | ~200−900 | 4–23 | ~(10−30)° | |
Notes. All quantities are estimated at the exoplanet’s orbital distance of 0.031 AU. The wind parameters are based on the Parker model and a hydrostatic distribution of isothermal gas density. The bottom conditions of the stellar corona are defined from X-rays observations (see text).
The interplanetary magnetic field is based on polarimetry observation of HD 189733 (Fares et al. 2010).
The θ angle is derived using an orbital velocity of ~152.5 km s-1 and a stellar corotation speed of ~28.5 km s-1 of the stellar plasma and magnetic field at the distance of the planet (Vidotto et al. 2011). A spin period of 11.9 days is assumed for the star (Henry & Winn 2008).
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