Initiation of bipolar flows by magnetic field twisting in protostellar nebulae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Interstellar Matter, Plasma Dynamics, Protostars, Star Formation, Stellar Models, Angular Momentum, Interstellar Magnetic Fields, Radio Jets (Astronomy), Stellar Winds, T Tauri Stars

Scientific paper

A model is developed for the time-dependent twisting of an initial poloidal magnetic field threading a conducting protostellar disk. The region outside the disk is assumed to be filled, at least initially, with a low-density, force-free 'coronal' plasma. The differential rotation of the disk acts to twist the B field in the space outside the disk thus generating a toroidal magnetic field. In turn, the toroidal field acts to pinch the plasma and the poloidal field toward the system axis producing a collimated channel. This channel could facilitate the formation of bipolar flows. The magnitude and duration of the field twisting is expected to be limited by magnetohydrodynamic instability.

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