Evolution and launching of the bipolar outflow perpendicular to the orbital plane. The gas density in panels a–d traces the evolution of the outflow, and in panel e we show the absolute magnetic field at the same time as in panel d. The bottom panelsf–m (rotated by 90° with respect to the upper panels), are at a time of 2880 d and illustrate the launching of the outflow. Shown are the radial velocity v_rad (f, g), the ratio of poloidal to toroidal magnetic-field strength B_pol/B_tor (i, h), the ratio of magnetic to thermal pressure β⁻¹ (j, k), and the poloidal Alfvén Mach number . Panels g, h, k, l: zoomed-in views of the central region around the binary. The black contours in panels k and l indicate “force-free” regions inside which both β⁻¹ >  1 and M_{alfven, pol} <  1.