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  The GRAVITY young stellar object survey - VI. Mapping the variable inner disk of HD 163296 at sub-au scales

Sanchez-Bermudez, J., Garatti, A. C. o., Lopez, R. G., Perraut, K., Labadie, L., Benisty, M., et al. (2021). The GRAVITY young stellar object survey - VI. Mapping the variable inner disk of HD 163296 at sub-au scales. Astronomy and Astrophysics, 654: A97. doi:10.1051/0004-6361/202039600.

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Sanchez-Bermudez, J., Author
Garatti, A. Caratti o, Author
Lopez, R. Garcia, Author
Perraut, K., Author
Labadie, L., Author
Benisty, M., Author
Brandner, W., Author
Dougados, C., Author
Garcia, P. J. V., Author
Henning, Th., Author
Klarmann, L., Author
Amorim, A., Author
Bauböck, M.1, Author              
Berger, J. P., Author
Le Bouquin, J. B., Author
Caselli, P.2, Author              
Clénet, Y., Author
du Foresto, V. Coudé, Author
de Zeeuw, P. T.1, Author              
Drescher, A.1, Author              
Duvert, G., AuthorEckart, A., AuthorEisenhauer, F.1, Author              Filho, M., AuthorGao, F.1, Author              Gendron, E., AuthorGenzel, R.1, Author              Gillessen, S.1, Author              Grellmann, R., AuthorHeissel, G., AuthorHorrobin, M., AuthorHubert, Z., AuthorJiménez-Rosales, A.1, Author              Jocou, L., AuthorKervella, P., AuthorLacour, S., AuthorLapeyrère, V., AuthorLéna, P., AuthorOtt, T.1, Author              Paumard, T., AuthorPerrin, G., AuthorPineda, J. E.2, Author              Rodríguez-Coira, G., AuthorRousset, G., AuthorSegura-Cox, D. M.2, Author              Shangguan, J.1, Author              Shimizu, T.1, Author              Stadler, J.1, Author              Straub, O.1, Author              Straubmeier, C., AuthorSturm, E.1, Author              Van Dishoeck, E.1, Author              Vincent, F., AuthorFellenberg, S. D. von1, Author              Widmann, F.1, Author              Woillez, J., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: Context. Protoplanetary disks drive some of the formation process (e.g., accretion, gas dissipation, formation of structures) of stars and planets. Understanding such physical processes is one of the most significant astrophysical questions. HD 163296 is an interesting young stellar object for which infrared and sub-millimeter observations have shown a prominent circumstellar disk with gaps plausibly created by forming planets. Aims. This study aims to characterize the morphology of the inner disk in HD 163296 with multi-epoch, near-infrared interferometric observations performed with GRAVITY at the Very Large Telescope Interferometer. Our goal is to depict the K-band (λ0 ~ 2.2 μm) structure of the inner rim with milliarcsecond (sub-au) angular resolution. Our data is complemented with archival Precision Integrated-Optics Near-infrared Imaging ExpeRiment (H-band; λ0 ~ 1.65 μm) data of the source. Methods. We performed a gradient descent parametric model fitting to recover the sub-au morphology of our source. Results. Our analysis shows the existence of an asymmetry in the disk surrounding the central star of HD 163296. We confirm variability of the disk structure in the inner ~2 mas (0.2 au). While variability of the inner disk structure in this source has been suggested by previous interferometric studies, this is the first time that it is confirmed in the H- and K-bands by using a complete analysis of the closure phases and squared visibilities over several epochs. Because of the separation from the star, position changes, and the persistence of this asymmetric structure on timescales of several years, we argue that it is probably a dusty feature (e.g., a vortex or dust clouds) made by a mixing of silicate and carbon dust and/or refractory grains, inhomogeneously distributed above the mid-plane of the disk.

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Language(s): eng - English
 Dates: 2021-10-18
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202039600
 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: 654 Sequence Number: A97 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1