Two-flow magnetohydrodynamical jets around young stellar objects |
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| Authors: | Fabien Casse Zakaria Meliani Christophe Sauty |
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| Institution: | (1) AstroParticule & Cosmologie (APC), 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France;(2) Institute for Plasma Physics “Rijnhuizen”, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands;(3) Observatoire de Paris, L.U.Th., 92190 Meudon, France |
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| Abstract: | We present the first-ever simulations of non-ideal magnetohydrodynamical (MHD) stellar winds coupled with disc-driven jets
where the resistive and viscous accretion disc is self-consistently described. The transmagnetosonic, collimated MHD outflows
are investigated numerically using the VAC code. Our simulations show that the inner outflow is accelerated from the central
object hot corona thanks to both the thermal pressure and the Lorentz force. In our framework, the thermal acceleration is
sustained by the heating produced by the dissipated magnetic energy due to the turbulence. Conversely, the outflow launched
from the resistive accretion disc is mainly accelerated by the magneto-centrifugal force. We also show that when a dense inner
stellar wind occurs, the resulting disc-driven jet have a different structure, namely a magnetic structure where poloidal
magnetic field lines are more inclined because of the pressure caused by the stellar wind. This modification leads to both
an enhanced mass ejection rate in the disc-driven jet and a larger radial extension which is in better agreement with the
observations besides being more consistent. |
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| Keywords: | Winds Outflows Accretion discs Jets YSO Galaxies |
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