Statistics – Computation
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt.......107t&link_type=abstract
PhD Thesis, Laboratoire d'Astrophysique, Université Joseph Fourier / CNRS, Grenoble, France, 1993.
Statistics
Computation
1
Scientific paper
Observations show that a majority of T Tauri stars are binary systems. This led us to study tidal effects induced by a stellar companion on the disk surrounding a T Tauri star. We first calculated the tidally-induced perturbation in both cases of self-gravitating and accretion circumstellar disks. In order to obtain an analytical solution, we assumed that the perturbation was small. The amplitude of the obtained deformation then reaches 1% of the radius of the disk in the case of an accretion disk, and 10% in the case of a self-gravitating disk. To evaluate the influence of this deformation on the spectral energy distribution, we then calculated the energy emitted in a given direction by the warped disk and its central star, taking into account the shadowing of the star by the disk and of the disk by the star. We applied these computations to young stellar objects. In the case of small perturbations, when the separation between the two stars is greater than a hundred of astronomical units, tidal effects in circumstallar disk have a significant effect on the submillimetric range of the spectral energy distribution. We demonstrated that the energy emitted in this range is 2 to 20 times the energy emitted by a flat disk. This result will be tested by future submillimetric observations. In order to evaluate the possible influence of tidal effects in closer binary systems, we then parametrized the deformation. This model allowed us to reproduce spectral energy distributions of T Tauri stars with strong infrared excess. Also, the resulting spectral energy distributions led us to propose a new interpretation of Class I young stellar objects: a Class I spectral energy distribution can result from hidding a T Tauri star in a warped disk. Possible observational support of this model is given by recent millimetric observations of Andre and Montmerle, who showed that the mass of matter surrounding Class I objects may not be very different from the mass of matter surrounding T Tauri stars. Finally, we performed a preliminary study of the influence of the deformation on the accretion rate in the disk and concluded that tidal forces in the disk acts as a pseudo-viscosity that may produce disk accretion.
No associations
LandOfFree
Tidally-induced warps in the disks of young stellar objects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Tidally-induced warps in the disks of young stellar objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tidally-induced warps in the disks of young stellar objects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1542717