Scientific rational
The ways a star-disk system launches and collimates jets is one of the yet unsolved problems in contemporary astrophysics. This problem is relevant in active galactic nuclei, micro-quasars, gamma-ray bursts, planetary nebulae and young stars. Although there is agreement in that magnetic fields mediate the process the exact details still remain elusive.

The larger angular size of the jet engines in young stars makes them important laboratories for direct observational model testing. In parallel, the recent advent of high energy density facilities has added experimental control to jet studies.

Testing models for jet launching and collimation requires a high degree of interdisciplinary and sophistication. Indeed, closing the circle between pure MHD, thermo-chemical evolution, high angular resolution spectro-imaging and laboratory experiments is not trivial. This school aims at bridging these gaps by providing a series of lectures bridging the foundations of the discipline. In parallel, some space is reserved to short contributed talks addressing front-line research in the field.

This school is the 4^th JETSET school. JETSET is a research network on the topic of collimated mass ejection joining lab experiments, simulations and astrophysical observations. The networks joins 10 labs and around 40 researchers and was funded by the European Union.

Important dates
April, 30^th – Hotel reservations are subject to availability
April, 30^th – deadline for financial support
May, 31^st – deadline for submission of abstracts for contributed talks
May, 31^st – deadline for early registration
June, 1^st – selected contributed speakers notified
June, 25^th – school starts
June, 29^th – school ends
December, 31^st – proceedings submission deadline (lecturers only)

Contact
jets-4@astro.up.pt

Local organizing committee
João M.T. Ferreira (Universidade dos Açores and CAUP, PT), Elsa Silva (CAUP, PT), Despina Panoglou (CAUP, PT), Samira Rajabi (CAUP, PT)

Scientific organizing committee
Paulo J.V. Garcia (CAUP, PT), Tom Ray (DIAS, IE), Sergey Lebdev (IC, UK), Kanaris Tsinganos (UA, GR), Sylvie Cabrit (OPM, FR), Alex Raga (UNAM, MX), Pat Hartigan (RU, USA), Chris Davis (JAC, USA)