Modeling the Photopolarimetric Variability of AA Tau

Details Modeling the Photopolarimetric Variability of AA Tau Modeling the Photopolarimetric Variability of AA Tau

2005-01-24

arxiv.org/abs/astro-ph/0501506v2

Mon.Not.Roy.Astron.Soc.358:632-640,2005

Astronomy and Astrophysics

Astrophysics

9 Pages, 10 Figures. Accepted for publishing in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.08805.x

We present Monte Carlo scattered light models of a warped disk that reproduce the observed photopolarimetric variability of the classical T Tauri star AA Tau. For a system inclination of 75 deg and using an analytic description for a warped inner disk, we find that the shape and amplitude of the photopolarimetric variability are reproduced with a warp which occults the star, located at 0.07 au, amplitude 0.016 au, extending over radial and azimuthal ranges 0.0084 au and 145 deg. We also show a time sequence of high spatial resolution scattered light images, showing a dark shadow cast by the warp sweeping round the disk. Using a modified smooth particle hydrodynamics code, we find that a stellar dipole magnetic field of strength 5.2 kG, inclined at 30 deg to the stellar rotation axis can reproduce the required disk warping to explain AA Tau's photopolarimetric variability.

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