Skip to Main content Skip to Navigation
Journal articles

Line and continuum radiative transfer modelling of AA Tau

Abstract : We present photometric and spectroscopic models of the Classical T Tauri star AA Tau. Photometric and spectroscopic variability present in observations of AA Tau is attributed to a magnetically induced warp in the accretion disc, periodically occulting the photosphere on an 8.2 d time-scale. Emission line profiles show signatures of both infall, attributed to magnetospherically accreting material, and outflow. Using the radiative transfer code TORUS, we have investigated the geometry and kinematics of AA Tau's circumstellar disc and outflow, which is modelled here as a disc wind. Photometric models have been used to constrain the aspect ratio of the disc, the offset angle of the magnetosphere dipole with respect to the stellar rotation axis, and the inner radius of the circumstellar disc. Spectroscopic models have been used to constrain the wind and magnetosphere temperatures, wind acceleration parameter, and mass-loss rate. We find that observations are best fitted by models with a mass accretion rate of 5 × 10-9 M yr-1, a dipole offset of between 10° and 20°, a magnetosphere that truncates the disc from 5.2 to 8.8R, a mass-loss-rate to accretion-rate ratio of ∼0.1, a magnetosphere temperature of 8500-9000 K, and a disc-wind temperature of 8000 K.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03618538
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, March 24, 2022 - 2:53:51 PM
Last modification on : Friday, March 25, 2022 - 4:02:01 AM
Long-term archiving on: : Saturday, June 25, 2022 - 7:19:28 PM

File

stu1211.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Claire F. Esau, Tim J. Harries, Jerome Bouvier. Line and continuum radiative transfer modelling of AA Tau. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2014, 443, pp.1022-1043. ⟨10.1093/mnras/stu1211⟩. ⟨insu-03618538⟩

Share

Metrics

Record views

14

Files downloads

1