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The magnetorotational instability as a jet launching mechanism

Lesur, G. ; Ferreira, J. ; Ogilvie, G. I.

Astronomy and astrophysics (Berlin), 2013-02, Vol.550, p.1-13 [Periódico revisado por pares]

EDP Sciences

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  • Título:
    The magnetorotational instability as a jet launching mechanism
  • Autor: Lesur, G. ; Ferreira, J. ; Ogilvie, G. I.
  • Assuntos: Astrophysics ; Discs ; Disks ; instabilities ; Instability ; ISM: jets and outflows ; magnetohydrodynamics (MHD) ; Nonlinearity ; Outflow ; Sciences of the Universe ; Stability ; Three dimensional ; Turbulent flow
  • É parte de: Astronomy and astrophysics (Berlin), 2013-02, Vol.550, p.1-13
  • Notas: publisher-ID:aa20395-12
    dkey:10.1051/0004-6361/201220395
    istex:83EE53C4CA06CD1366F00B15CB3BE2135745EC2B
    ark:/67375/80W-QG7FP0W2-7
    e-mail: geoffroy.lesur@obs.ujf-grenoble.fr
    bibcode:2013A%26A...550A..61L
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Magnetorotational turbulence and magnetically driven disc winds are often considered as separate processes. However, realistic astrophysical discs are expected to be subject to both effects, although possibly at different times and locations. We investigate here the potential link between these two phenomena using a mixed numerical and analytical approach. We show in particular that large-scale magnetorotational instability modes which dominate strongly magnetised discs (plasma β ~ 10) naturally produce magnetically driven outflows in the nonlinear regime. We show that these outflows share many similarities with local and global disc wind solutions found in the literature. We also investigate the 3D stability of these outflows and show that they are unstable on dynamical timescales. The implications of these results for the transition between a jet-emitting disc and a standard “viscous” disc are discussed.
  • Editor: EDP Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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