Publication Date:
2016-04-21
Description:
We investigate the effect that the turbulent mixing strength parameter α turb plays on near-infrared polarimetric and sub-millimetre interferometric imaging observations of transitional discs (TDs) with a gap carved by a planet. We generate synthetic observations of these objects with ALMA and VLT/SPHERE-ZIMPOL by combining hydrodynamical, dust evolution, radiative transfer and instrument models for values of $\mbox{$\alpha _{\rm {turb}}$}=[10^{-4}, 10^{-3}, 10^{-2}]$ . We find that, through a combination of effects on the viscosity of the gas, the turbulent mixing and dust evolution processes, α turb strongly affects the morphology of the dust distribution that can be traced with these observations. We constrain the value of α turb to be within an order of magnitude of 10 –3 in TD sources that show cavities in sub-mm continuum images while featuring continuous distribution of dust or smaller cavities in NIR-polarimetric images.
Print ISSN:
1745-3925
Electronic ISSN:
1745-3933
Topics:
Physics
Permalink