Evolution of irradiated Circumbinary Disks
Richard Günther, Christoph Schäfer, Wilhelm Kley
Astronomy & Astrophysics, 423, 559-566 (2004)
We study the evolution and emission of circumbinary disks around close
classical T Tauri binary systems. High resolution numerical hydrodynamical
simulations are employed to model a system consisting of a central eccentric
binary star within an irradiated accretion disk. A detailed energy balance
including viscous heating, radiative cooling and irradiation from the central
star is applied to calculate accurately the emitted spectral energy
distribution. Numerical simulations using two different methods,
the previously developed Dual-Grid technique with a finite difference
discretization, and the Smoothed Particle Hydrodynamics method are employed
to compare the hydrodynamical features and strengthen our conclusions.
Physical parameters of the setup are chosen to model the close systems of
DQ Tau and AK Sco. Using the self-consistent models, we are able to fit
the observed spectral energy distributions by constraining parameters such
as disk mass, density profile and radial extension for those systems.
We find that the incorporation of irradiation effects is necessary to
obtain correct disk temperatures.
Preprint, May 2004
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