Conveners
Wednesday Afternoon
- Philip Armitage (University of Colorado)
22.
Linear stability of accretion disks under the influence of stratification and thermal relaxation
Dr
Hubert Klahr
(MPIA)
06/08/2014, 14:00
Workshop Main Programme
Keplerian disks have proven to be extremely stable to perturbations, when magnetic fields are not in operation. But disks around young stars are complicated entities - they share a lot of properties with planetary atmospheres and one can learn a lot from the stability of rotating stars. Disks around young stars have a radial temperature gradient driven by stellar irradiation, which leads to a...
Prof.
Richard Nelson
(Queen Mary University of London)
06/08/2014, 14:30
Workshop Main Programme
Accretion discs with radial temperature gradients have angular velocity profiles that vary both with radius and height. The presence of vertical shear can lead to a hydrodynamic instability (the vertical shear instability - VSI) that is essentially a manifestation of the Goldreich-Schubert-Fricke instability in the disc context. In this talk I will present the results from a recent study in...
Dr
Martin Pessah
(Niels Bohr International Academy)
06/08/2014, 15:30
Workshop Main Programme
The shearing box has been extensively used for studying local processes in accretion disks. This framework is appropriate for studying barotropic disks, for which the pressure is only a function of the density and the angular frequency is independent of height. I will introduce a more general framework by showing that, given a global disk model, it is possible to develop consistent models that...
