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Fig. 5.

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Evolution and launching of the bipolar outflow perpendicular to the orbital plane. The gas density in panels ad 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 panelsfm (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 vrad (f, g), the ratio of poloidal to toroidal magnetic-field strength Bpol/Btor (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 Malfven, pol <  1.

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