Are Magnetic Wind-Driving Disks Inherently Unstable?

Details Are Magnetic Wind-Driving Disks Inherently Unstable? Are Magnetic Wind-Driving Disks Inherently Unstable?

2004-09-09

arxiv.org/abs/astro-ph/0409208v1

Astrophys.J. 617 (2004) 1267-1271

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, to be published in ApJ, vol. 617 (2004 Dec 20). Uses emulateapj.cls

Scientific paper

10.1086/425648

There have been claims in the literature that accretion disks in which a centrifugally driven wind is the dominant mode of angular momentum transport are inherently unstable. This issue is considered here by applying an equilibrium-curve analysis to the wind-driving, ambipolar diffusion-dominated, magnetic disk model of Wardle & Konigl (1993). The equilibrium solution curves for this class of models typically exhibit two distinct branches. It is argued that only one of these branches represents unstable equilibria and that a real disk/wind system likely corresponds to a stable solution.

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