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We present a detailed physical analysis of the jet launching mechanism of acircum-stellar disk that is located in a binary system. Applying 3D resistiveMHD simulations, we investigate the local and global properties of the system,such as the angular momentum transport and the accretion and ejection massfluxes. In comparison to previous works, for the first time, we have consideredthe full magnetic torque, the presence of an outflow, thus the angular momentumtransport by vertical motion, and the binary torque. We discuss its specific 3Dstructure, and how it is affected by tidal effects. We find that the spiralstructure evolving in the disk is {\em launched into the outflow}. We proposeto call this newly discovered structure a {\em jet spiral wall}. These spiralfeatures follow the same time evolution, with the jet spiral somewhat laggingthe disk spiral. We find that the vertical transport of angular momentum has asignificant role in the total angular momentum budget also in a binary system.The same holds for the magnetic torque, however, the contribution from the$\phi$-derivative of magnetic pressure and the $B_{\phi}B_r$ stresses aresmall. The gravity torque arising from the time-dependent 3D Roche potentialbecomes essential, as it constitutes the fundamental cause for all 3D effectsappearing in our disk-jet system. Quantitatively, we find that the diskaccretion rate in a binary system increases by $20\%$ compared to a disk arounda single star. The disk wind mass flux increases by even 50\%.

The physics of the MHD disk-jet transition in binary systems: jetted spiral walls launched from disk spiral arms