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Déformation des disques circumstellaires par effet de marée : application aux objets stellaires jeunes

Abstract : Observations of T Tauri stars show that a majority of them are binary systems. On the other hand, deformation of circumstellar disks have a great influence on the spectral energy distribution of these stars. These reasons led us to study tidal effects in binary systems of young stellar objects. We first calculated the tidally-induced perturbation in both cases of self-gravitating and accretion circumstellar disks. To obtain an analytical development, we assumed in this study that the perturbation was small (linear case). To evaluate the influence of this deformation on the spectral energy distribution, we then calculated the energy emitted in a given direction by the system of the warped disk and central star. This study was done in the general case, i.e. we took into account the shadow of the disk on the star, and of the star on the disk. We applied these two studies to young stellar objects. We showed that in the case of small perturbations, when the separation between the two stars is greater than 100 UA, tidal effects in circumstallar disk have a significant effect on the submillimetric range of the spectral energy distribution. To evaluate the influence of the se effects in closer binary systems, we then parametrized the deformation. The obtained spectral energy distributions led us to propose a new interpretation of class I young stellar objects, and allow us to reproduce specral energy distributions of T Tauri stars with strong infra-red excess. Finally, we study in a preliminary way the influence of the deformation on the accretion rate in the disk.
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Submitted on : Tuesday, April 10, 2012 - 10:45:47 AM
Last modification on : Tuesday, October 19, 2021 - 6:57:20 PM
Long-term archiving on: : Wednesday, December 14, 2016 - 9:32:05 PM


  • HAL Id : tel-00686407, version 1




Caroline Terquem. Déformation des disques circumstellaires par effet de marée : application aux objets stellaires jeunes. Astrophysique stellaire et solaire [astro-ph.SR]. Université Scientifique et Médicale de Grenoble, 1993. Français. ⟨tel-00686407⟩



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