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

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Sanchez Bermudez, J (Author) Other; Garatti, ACO (Author) Other; Lopez, RG (Author) Other; Perraut, K (Author) Other; Labadie, L (Author) Other; Benisty, M (Author) Other; Brandner, W (Author) Other; Dougados, C (Author) Other; P. J. V. Garcia (Author) FEUP; Henning, T (Author) Other; Klarmann, L (Author) Other; Amorim, A (Author) Other; Baubock, M (Author) Other; Berger, JP (Author) Other; Le Bouquin, JB (Author) Other; Caselli, P (Author) Other; Clenet, Y (Author) Other; du Foresto, VC (Author) Other; de Zeeuw, PT (Author) Other; Drescher, A (Author) Other; Duvert, G (Author) Other; Eckart, A (Author) Other; Eisenhauer, F (Author) Other; Mercedes E Filho (Author) FEUP; Gao, F (Author) Other; Gendron, E (Author) Other; Genzel, R (Author) Other; Gillessen, S (Author) Other; Grellmann, R (Author) Other; Heissel, G (Author) Other; Horrobin, M (Author) Other; Hubert, Z (Author) Other; Jimenez Rosales, A (Author) Other; Jocou, L (Author) Other; Kervella, P (Author) Other; Lacour, S (Author) Other; Lapeyrere, V (Author) Other; Lena, P (Author) Other; Ott, T (Author) Other; Paumard, T (Author) Other; Perrin, G (Author) Other; Pineda, JE (Author) Other; Rodriguez Coira, G (Author) Other; Rousset, G (Author) Other; Segura Cox, DM (Author) Other; Shangguan, J (Author) Other; Shimizu, T (Author) Other; Stadler, J (Author) Other; Straub, O (Author) Other; Straubmeier, C (Author) Other; Sturm, E (Author) Other; van Dishoeck, E (Author) Other; Vincent, F (Author) Other; von Fellenberg, SD (Author) Other; Widmann, F (Author) Other; Woillez, J (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 654

Final page: A97

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-00V-K9S

DOI: 10.1051/0004-6361/202039600

Abstract (EN): 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 (lambda(0) similar to 2.2 mu m) 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; lambda(0) similar to 1.65 mu m) 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 similar to 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 30