(a) Alfvén Mach numbers as a function of distance from the host star. The solid curve shows the median model, and the gray filled region shows the 1σ credible interval around the median model. The gray vertical dashed lines show the orbital distance of the planet. (b) Total Poynting flux as a function of distance of the star as calculated with the ST model (blue solid curve) and the Lanza model (red solid curve). The blue and red shaded regions show the corresponding 1σ credible intervals around the median model. The gray region in panel (b) shows the radio constraint from Vedantham et al. (2020) assuming a fixed B_* = 0.01 G.