0000000001239118
AUTHOR
Henri Pépin
Laboratory formation of a scaled protostellar jet by coaligned poloidal magnetic field
International audience; Although bipolar jets are seen emerging from a wide variety of astrophysical systems, the issue of their formation and morphology beyond their launching is still under study. Our scaled laboratory experiments, representative of young stellar object outflows, reveal that stable and narrow collimation of the entire flow can result from the presence of a poloidal magnetic field whose strength is consistent with observations. The laboratory plasma becomes focused with an interior cavity. This gives rise to a standing conical shock from which the jet emerges. Following simulations of the process at the full astrophysical scale, we conclude that it can also explain recentl…
Laboratory unraveling of matter accretion in young stars
When matter accretes onto a young star, a shell of dense material can form around the impact, reducing its x-ray emission.