Stability and structure of analytical MHD jet formation models with a finite outer disk radius

Abstract

(Abridged) Finite radius accretion disks are a strong candidate for launching astrophysical jets from their inner parts and disk-winds are considered as the basic component of such magnetically collimated outflows. The only available analytical MHD solutions for describing disk-driven jets are those characterized by the symmetry of radial self-similarity. Radially self-similar MHD models, in general, have two geometrical shortcomings, a singularity at the jet axis and the non-existence of an intrinsic radial scale, i.e. the jets formally extend to radial infinity. Hence, numerical simulations are necessary to extend the analytical solutions towards the axis and impose a physical boundary at finite radial distance. We focus here on studying the effects of imposing an outer radius of the underlying accreting disk (and thus also of the outflow) on the topology, structure and variability of a radially self-similar analytical MHD solution. The initial condition consists of a hybrid of an unchanged and a scaled-down analytical solution, one for the jet and the other for its environment. In all studied cases, we find at the end steady two-component solutions.

14 pages, 15 figures, accepted for publication in A & A

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Cited by in corpus (7)

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• Nonradial and nonpolytropic astrophysical outflows IX. Modeling T Tauri jets with a low mass-accretion rate
• Young stellar object jet models: From theory to synthetic observations
• Numerical simulations of MHD jets from Keplerian accretion disks I-Recollimation shocks
• 3D simulations of disc-winds extending radially self-similar MHD models
• Comparison of synthetic maps from truncated jet-formation models with YSO jet observations
• Comparison of synthetic maps from truncated jet-formation models with YSO jet observations. II. The effect of varying inclinations