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Jets From Young Stars V pp 201–222Cite as

Jets and Outflows from Collapsing Objects

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Part of the book series: Lecture Notes in Physics ((LNP,volume 791))

Abstract

Jets and outflows are ubiquitously observed around young stellar objects. There is now strong evidence that these jets are launched from the protostellar disc around the young stars through the coupling of magnetic fields. Magnetic fields threading the pre-stellar molecular cores are dragged inwards during the gravitational collapse and are wound up by the rotating gas in the protostellar disc. The resulting geometry of the magnetic field is that of a hourglass. The magnetic flux is strongly compressed inside the central region and flux lines pointing outwards connecting to the outer region. Additionally, the magnetic field lines anchored to the underlying protodisc are wound up and acquire a strong toroidal component. Such a field configuration, together with the underlying rotor, is known to launch and accelerate material off the disc. This could be the onset of the observed jets around young stellar objects.

In this contribution to the Jetset lecture notes we summarise the research progress in the field of jet launching from collapsing objects. Complying with this workshop on high-performance computing in astrophysics this is done while focusing on results from numerical simulations for this task.

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Acknowledgments

I thank the JETSET Network which gave me the opportunity to present this lecture. I also thank the organisers of the 5th Jetset workshop for their hospitality. I am funded by the Deutsche Forschungsgemeinschaft within the Emmy-Noether grant BA 3706/1.

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  1. Institute for Theoretical Astrophysics at the Zentrum für Astronomie of the University Heidelberg, Albert-Ueberle-Str. 2, Heidlberg, Germany

    Robi Banerjee

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  1. MPI für Astronomie, Königstuhl 17, Heidelberg, 69117, Germany

    José Gracia

  2. Dept. Astronomy & Astrophysics, University of California, High Street 1156, Santa Cruz, 95064, U.S.A.

    Fabio Colle

  3. School of Mathematical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland

    Turlough Downes

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Banerjee, R. (2009). Jets and Outflows from Collapsing Objects. In: Gracia, J., Colle, F., Downes, T. (eds) Jets From Young Stars V. Lecture Notes in Physics, vol 791. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03370-4_8

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