Stellar wind simulation of the Tau Boo system, with the star shown in gray and the planet’s orbit as a solid black line. Magnetic field lines connecting the star to the orbit are color-coded by the logarithmic ratio of plasma frequency (f_pe) to cyclotron frequency (f_ce); $\log \left(\frac{f_{\mathrm{p}\mathrm{e}}}{f_{\mathrm{c}\mathrm{e}}}\right)<-1$ indicates that radio waves can escape, while $\log \left(\frac{f_{\mathrm{p}\mathrm{e}}}{f_{\mathrm{c}\mathrm{e}}}\right)>-1$ indicates reflection or absorption near the star. The system is displayed at an inclination of 44.5° relative to Earth, and black dots mark radio source positions at 29 December 2010. An interactive version showing evolving source positions is available at “Tau Boo system source position animation”. In the latter, you can rotate and zoom to examine the source position in more detail. Note: the animation must be paused before rotating the view.