3D PIC code simulation of the HD 189733 b magnetosphere as seen from the bottom of the simulation box. The equatorial plane is shown. We can clearly see the exoplanet’s bow-shock and atmospheric nebula. Streamlines show the large-scale flow pattern, particulaly the corotation effect of the planet. This simulation was obtained for a stellar wind that has a sonic Mach number M_s ~ 4.8, an Alfvèn Mach number M_A ~ 5.5, and a magnetosonic Mach number M_ms ~ 3.6. The exoplanet is located at coordinates x = 120Δr, y = 97Δr, and z = 98Δr in the simulation box (reference frame defined by the star-planet line, the north-south magnetic poles, and the dawn-dusk directions). The intrinsic magnetic field of the planet is selected to obtain a stand-off distance of ~16.7 R_p, which allows a good fit to the C II light curve (see Fig. 8). The grid has Δr units. The star is located toward the top of the page.