Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460501n&link_type=abstract
American Astronomical Society, AAS Meeting #214, #605.01
Astronomy and Astrophysics
Astronomy
Scientific paper
Jet systems with two unequal components interact with their parent accretion disks through the asymmetric removal of linear momentum from the star-disk system. This dynamical interaction forces the disk's mid-profile to depart from a plane and assume the shape of a sombrero curved in the direction of the weaker jet component. The radial extent of the sombrero profile is given by the location where the excitation time due to momentum loss is comparable to the local dynamical time. For thin disks the sombrero profile makes the temperature independent of radius. For thick disks, the uneven heating of the disk surfaces leads to stratification. Asymmetric momentum removal also prevents the disk from reaching vertical hydrostatic equilibrium and instead causes a mass loss in the form of a secondary wind emanating only from the side of the weaker jet component. This secondary outflow is not accompanied by angular momentum removal. Jet time variability causes the disk to radially expand or contract depending on whether asymmetric momentum loss increases or decreases. Jet time variability also excites vertical motion and eccentric distortions in the disk, and affects the sombrero profile's curvature. These perturbations lead to the heating of the disk through its viscous stresses as it tries to settle into the varying state of minimum energy defined by the sombrero profile. These dynamical consequences may explain the origin of the secondary one-sided wind observed in the HH 30 system (Pety et al 2006, AA 458, 841). Reference: Namouni 2007, ApJ 659, 1505.
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