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Jets from Young Stars: The Need for MHD Collimation and Acceleration Processes

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Jets from Young Stars

Part of the book series: Lecture Notes in Physics ((LNP,volume 723))

Abstract

This lecture revisits in the light of recent data the main lines of evidence indicating that MHD processes play a crucial role in jets from young stars. Measurements of jet collimation and jet ejection-accretion efficiencies are reviewed and compared at various evolutionary stages (from protostars to optically revealed objects). It is then shown that they cannot satisfactorily be accounted for by purely hydrodynamical processes. MHD magneto-centrifugal ejection (combining magnetic self-collimation and magnetic acceleration) appears as the most effective mechanism able to reproduce the observed jet properties at all evolutionary phases. The jets would then be intimately linked to angular momentum extraction from the accreting disk and/or star.

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Authors and Affiliations

  1. LERMA, Observatoire de Paris, CNRS, 61 Av, de l’Observatoire, 75014 Paris, France

    Sylvie Cabrit

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  1. Sylvie Cabrit
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Editors and Affiliations

  1. Laboratoire d’Astrophysique de Grenoble, Université Joseph Fourier, BP 53, 38041 Grenoble, France

    Jonathan Ferreira

  2. Laboratoire d’Astrophysique de Grenoble, Université Joseph Fourier, BP 53, 38041 Grenoble, France

    Catherine Dougados

  3. Dublin Institute for Advanced Studies, Dublin 2, Ireland, 5 Merrion Square

    Emma Whelan

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Cabrit, S. (2007). Jets from Young Stars: The Need for MHD Collimation and Acceleration Processes. In: Ferreira, J., Dougados, C., Whelan, E. (eds) Jets from Young Stars. Lecture Notes in Physics, vol 723. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-68035-2_2

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