The Stellar-Disk Electric (Short) Circuit: Observational Predictions for a YSO Jet Flow

Details The Stellar-Disk Electric (Short) Circuit: Observational Predictions for a YSO Jet Flow The Stellar-Disk Electric (Short) Circuit: Observational Predictions for a YSO Jet Flow

2007-06-23

arxiv.org/abs/0706.3440v1

Astrophys.SpaceSci.311:69-74,2007

Astronomy and Astrophysics

Astrophysics

6 pages, 8 figures, Accepted for publication in Astrophysics & Space Science

Scientific paper

10.1007/s10509-007-9562-0

We discuss the star-disk electric circuit for a young stellar object (YSO) and calculate the expected torques on the star and the disk. We obtain the same disk magnetic field and star-disk torques as given by standard magnetohydrodynamic (MHD) analysis. We show how a short circuit in the star-disk electric circuit may produce a magnetically-driven jet flow from the inner edge of a disk surrounding a young star. An unsteady bipolar jet flow is produced that flows perpendicular to the disk plane. Jet speeds of order hundreds of kilometres per second are possible, while the outflow mass loss rate is proportional to the mass accretion rate and is a function of the disk inner radius relative to the disk co-rotation radius.

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