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

Sanchez-Bermudez, J.; Garatti, A. Caratti o; Lopez, R. Garcia; Perraut, K.; Labadie, L.; Benisty, M.; Brandner, W.; Dougados, C.; Garcia, P. J. V.; Henning, Th.; Klarmann, L.; Amorim, A.; Bauböck, M.; Berger, J. P.; Le Bouquin, J. B.; Caselli, P.; Clénet, Y.; du Foresto, V. Coudé; de Zeeuw, P. T.; Drescher, A.; Duvert, G.; Eckart, A.; Eisenhauer, F.; Filho, M.; Gao, F.; Gendron, E.; Genzel, R.; Gillessen, S.; Grellmann, R.; Heissel, G.; Horrobin, M.; Hubert, Z.; Jiménez-Rosales, A.; Jocou, L.; Kervella, P.; Lacour, S.; Lapeyrère, V.; Léna, P.; Ott, T.; Paumard, T.; Perrin, G.; Pineda, J. E.; Rodríguez-Coira, G.; Rousset, G.; Segura-Cox, D. M.; Shangguan, J.; Shimizu, T.; Stadler, J.; Straub, O.; Straubmeier, C.; Sturm, E.; Van Dishoeck, E.; Vincent, F.; Fellenberg, S. D. von; Widmann, F.; Woillez, J.

doi:10.1051/0004-6361/202039600

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

MPS-Authors

/persons/resource/persons216131

Bauböck, M.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons133043

Caselli, P.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons225865

de Zeeuw, P. T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons254980

Drescher, A.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4766

Eisenhauer, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214427

Gao, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4590

Genzel, R.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4768

Gillessen, S.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons216133

Jiménez-Rosales, A.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons16190

Ott, T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons172914

Pineda, J. E.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons216269

Segura-Cox, D. M.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232571

Shangguan, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons206401

Shimizu, T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons248280

Stadler, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232635

Straub, O.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4650

Sturm, E.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4714

Van Dishoeck, E.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons206120

Fellenberg, S. D. von
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214431

Widmann, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0009-A294-8

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.