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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660604.0, MPI für Astronomie / Publikationen_mpia
Revealing the inner circumstellar disk of the T Tauri star S Coronae Australis N using the VLTI
Authors:Vural, J.; Kreplin, A.; Kraus, S.; Weigelt, G.; Driebe, T.; Benisty, M.; Dugué, M.; Massi, F.; Monin, J. -. L.; Vannier, M.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:Astronomy and Astrophysics
Start Page:id.A162
Audience:Not Specified
Abstract / Description:<BR /> Aims: We investigate the structure of the circumstellar disk of the T Tauri star S CrA N and test whether the observations agree with the standard picture proposed for Herbig Ae stars. <BR /> Methods: Our observations were carried out with the VLTI/AMBER instrument in the H and K bands with the low spectral resolution mode. For the interpretation of our near-infrared AMBER and archival mid-infrared MIDI visibilities, we employed both geometric and temperature-gradient models. <BR /> Results: To characterize the disk size, we first fitted geometric models consisting of a stellar point source, a ring-shaped disk, and a halo structure to the visibilities. In the H and K bands, we measured ring-fit radii of 0.73 ± 0.03 mas (corresponding to 0.095 ± 0.018 AU for a distance of 130 pc) and 0.85 ± 0.07 mas (0.111 ± 0.026 AU), respectively. This K-band radius is approximately two times larger than the dust sublimation radius of ≈0.05 AU expected for a dust sublimation temperature of 1500 K and gray dust opacities, but approximately agrees with the prediction of models including backwarming (namely a radius of ≈0.12 AU). The derived temperature-gradient models suggest that the disk is approximately face-on consisting of two disk components with a gap between star and disk. The inner disk component has a temperature close to the dust sublimation temperature and a quite narrow intensity distribution with a radial extension from 0.11 AU to 0.14 AU. <BR /> Conclusions: Both our geometric and temperature-gradient models suggest that the T Tauri star S CrA N is surrounded by a circumstellar disk that is truncated at an inner radius of ≈ 0.11 AU. The narrow extension of the inner temperature-gradient disk component implies that there is a hot inner rim. Based on observations made with ESO telescopes at the La Silla Paranal Observatory under program IDs 081.C-0272(A), 083.C-0236(C).
Free Keywords:stars: individual: S Coronae Australis N; stars: pre-main sequence; circumstellar matter; protoplanetary disks; accretion; accretion disks; techniques: interferometric
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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