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  The GRAVITY young stellar object survey - VII. The inner dusty disks of T Tauri stars

Perraut, K., Labadie, L., Bouvier, J., Ménard, F., Klarmann, L., Dougados, C., et al. (2021). The GRAVITY young stellar object survey - VII. The inner dusty disks of T Tauri stars. Astronomy and Astrophysics, 655: A73. doi:10.1051/0004-6361/202141624.

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Perraut, K., Author
Labadie, L., Author
Bouvier, J., Author
Ménard, F., Author
Klarmann, L., Author
Dougados, C., Author
Benisty, M., Author
Berger, J.-P., Author
Bouarour, Y.-I., Author
Brandner, W., Author
Garatti, A. Caratti o, Author
Caselli, P.1, Author              
de Zeeuw, P. T.2, Author              
Garcia-Lopez, R., Author
Henning, T., Author
Sanchez-Bermudez, J., Author
Sousa, A., Author
Van Dishoeck, E.2, Author              
Alécian, E., Author
Amorim, A., Author
Clénet, Y., AuthorDavies, R.2, Author              Drescher, A., AuthorDuvert, G., AuthorEckart, A., AuthorEisenhauer, F.2, Author              Förster-Schreiber, N. M.2, Author              Garcia, P., AuthorGendron, E., AuthorGenzel, R.2, Author              Gillessen, S.2, Author              Grellmann, R., AuthorHeißel, G., AuthorHippler, S., AuthorHorrobin, M., AuthorHubert, Z., AuthorJocou, L., AuthorKervella, P., AuthorLacour, S., AuthorLapeyrère, V., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorLutz, D.2, Author              Ott, T.2, Author              Paumard, T., AuthorPerrin, G., AuthorScheithauer, S., AuthorShangguan, J.2, Author              Shimizu, T.2, Author              Stadler, J.2, Author              Straub, O.2, Author              Straubmeier, C., AuthorSturm, E.2, Author              Tacconi, L.2, Author              Vincent, F., AuthorFellenberg, S. von2, Author              Widmann, F.2, Author               more..
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: Context. T Tauri stars are surrounded by dust and gas disks. As material reservoirs from which matter is accreted onto the central star and planets are built, these protoplanetary disks play a central role in star and planet formation. Aims. We aim at spatially resolving at sub-astronomical unit (sub-au) scales the innermost regions of the protoplanetary disks around a sample of T Tauri stars to better understand their morphology and composition. Methods. Thanks to the sensitivity and the better spatial frequency coverage of the GRAVITY instrument of the Very Large Telescope Interferometer, we extended our homogeneous data set of 27 Herbig stars and collected near-infrared K-band interferometric observations of 17 T Tauri stars, spanning effective temperatures and luminosities in the ranges of ~4000–6000 K and ~0.4–10 L, respectively. We focus on the continuum emission and develop semi-physical geometrical models to fit the interferometric data and search for trends between the properties of the disk and the central star. Results. As for those of their more massive counterparts, the Herbig Ae/Be stars, the best-fit models of the inner rim of the T Tauri disks correspond to wide rings. The GRAVITY measurements extend the radius-luminosity relation toward the smallest luminosities (0.4–10 L). As observed previously, in this range of luminosities, the R ∝ L1∕2 trend line is no longer valid, and the K-band sizes measured with GRAVITY appear to be larger than the predicted sizes derived from sublimation radius computation. We do not see a clear correlation between the K-band half-flux radius and the mass accretion rate onto the central star. Besides, having magnetic truncation radii in agreement with the K-band GRAVITY sizes would require magnetic fields as strong as a few kG, which should have been detected, suggesting that accretion is not the main process governing the location of the half-flux radius of the inner dusty disk. The GRAVITY measurements agree with models that take into account the scattered light, which could be as important as thermal emission in the K band for these cool stars. The N-to-K band size ratio may be a proxy for disentangling disks with silicate features in emission from disks with weak and/or in absorption silicate features (i.e., disks with depleted inner regions and/or with large gaps). The GRAVITY data also provide inclinations and position angles of the inner disks. When compared to those of the outer disks derived from ALMA images of nine objects of our sample, we detect clear misalignments between both disks for four objects. Conclusions. The combination of improved data quality with a significant and homogeneous sample of young stellar objects allows us to revisit the pioneering works done on the protoplanetary disks by K-band interferometry and to test inner disk physics such as the inner rim morphology and location.

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Language(s): eng - English
 Dates: 2021-11-22
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202141624
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 655 Sequence Number: A73 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1