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Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field

Abstract : he shaping of astrophysical outflows into bright, dense, and collimated jets due to magnetic pressure is here investigated using laboratory experiments. Here we look at the impact on jet collimation of a misalignment between the outflow, as it stems from the source, and the magnetic field. For small misalignments, a magnetic nozzle forms and redirects the outflow in a collimated jet. For growing misalignments, this nozzle becomes increasingly asymmetric, disrupting jet formation. Our results thus suggest outflow/magnetic field misalignment to be a plausible key process regulating jet collimation in a variety of objects from our Sun’s outflows to extragalatic jets. Furthermore, they provide a possible interpretation for the observed structuring of astrophysical jets. Jet modulation could be interpreted as the signature of changes over time in the outflow/ambient field angle, and the change in the direction of the jet could be the signature of changes in the direction of the ambient field.
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Submitted on : Friday, October 15, 2021 - 11:30:45 AM
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G. Revet, B. Khiar, E. Filippov, C. Argiroffi, Jérome Béard, et al.. Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field. Nature Communications, Nature Publishing Group, 2021, 12 (1), pp.762. ⟨10.1038/s41467-021-20917-x⟩. ⟨hal-02572570⟩



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