Interconnecting loop model. Top: Magnetic field of the star at the orbital distance of the planet, assuming a potential field extrapolation, with a source surface of ≃ 15R_⋆ (in this case, no wind model is used). Bottom: Maximum dissipated power in the interconnecting loop model, assuming a polar planetary magnetic field strength (dipole) of 2 G (dashed) and 6 G (solid). The colour scheme follows the colour bar shown in Fig. 3. The grey arrows in the upper horizontal axes indicate approximate times of mid-transits.