The asymmetric inner disk of the Herbig Ae star HD 163296 in the eyes of VLTI/MATISSE: evidence for a vortex?
J. VargaKonkoly Observatory, Research Centre for Astronomy and Earth Sciences, Konkoly Thege Miklós út 15-17, 1121 Budapest, HungaryM. HogerheijdeAnton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1090 GE Amsterdam, The NetherlandsR. van BoekelMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyL. KlarmannMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyR. PetrovLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceL. B. F. M. WatersInstitute for Mathematics, Astrophysics and Particle Physics, Radboud University, PO Box 9010, MC 62 6500 GL Nijmegen, The NetherlandsS. LagardeLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceE. PantinAIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, FrancePh. BerioLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceG. WeigeltMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyS. Robbe-DuboisLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceB. LopezLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceF. MillourLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceJ.-C. AugereauUniversité Grenoble AlpesH. MeheutLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceA. MeillandLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceTh. HenningMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyW. JaffeLeiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The NetherlandsF. BettonvilNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsP. BristowEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyK.-H. HofmannMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyA. MatterLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceG. ZinsEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileS. WolfInstitut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstraße 15, 24118, Kiel, GermanyF. AlloucheLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceF. DonnanLeiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The NetherlandsD. SchertlMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyC. DominikAnton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1090 GE Amsterdam, The NetherlandsM. HeiningerMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyM. LehmitzMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyP. CruzalèbesLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceA. GlindemannEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyK. MeisenheimerMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyC. PaladiniEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileM. SchöllerEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyJ. WoillezEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyL. VenemaNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsE. KokoulinaLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceG. YoffeMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyP. ÁbrahámInstitute of Physics, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, 1117 Budapest, HungaryS. AbadieEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileR. AbuterEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyM. AccardoEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyT. AdlerMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyT. AgócsNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsP. AntonelliLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceA. BöhmMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyC. BailetLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceG. BazinEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyU. BeckmannMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyJ. BeltranEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileW. BolandLeiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The NetherlandsP. BourgetEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileR. BrastEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyY. BressonLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceL. BurtscherLeiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The NetherlandsR. CastilloEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileA. ChelliLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceC. CidEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileJ.-M. ClausseLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceC. ConnotMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyR. D. ConzelmannEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyW.-C. DanchiLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceM. De HaanNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsM. DelboLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceM. EbertMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyE. ElswijkNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsY. FanteiLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceR. FrahmEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyV. Gámez RosasLeiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The NetherlandsA. GabaschEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyA. GallenneDepartamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, ChileE. GarcesEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileP. GirardLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceF. Y. J. GontéEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyJ. C. González HerreraEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyU. GraserMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyP. GuajardoEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileF. GuittonLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, FranceX. HauboisEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileJ. HronDepartment of Astrophysics, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, AustriaN. HubinEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyR. HuertaEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileJ. W. IsbellMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyD. IvesEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyG. JakobEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyA. JaskóKonkoly Observatory, Research Centre for Astronomy and Earth Sciences, Konkoly Thege Miklós út 15-17, 1121 Budapest, HungaryL. JochumEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileR. KleinMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyJ. KragtNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsG. KroesNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsS. KuindersmaNOVA Optical IR Instrumentation Group at ASTRON, Dwingeloo, NetherlandsL. LabadieI. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, GermanyW. LaunMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyR. Le PooleLeiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The NetherlandsC. LeinertMax Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, GermanyJ.-L. LizonEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyM. LopezEuropean Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, ChileA. MérandEuropean Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, GermanyA. MarcottoLaboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Boulevard de l’Observatoire, CS 34229, 06304 Nice Cedex 4, France
2020en
ABI
Аннотация
Context. A complex environment exists in the inner few astronomical units of planet-forming disks. High-angular-resolution observations play a key role in our understanding of the disk structure and the dynamical processes at work. Aims. In this study we aim to characterize the mid-infrared brightness distribution of the inner disk of the young intermediate-mass star HD 163296 from early VLTI/MATISSE observations taken in the L - and N -bands. We put special emphasis on the detection of potential disk asymmetries. Methods. We use simple geometric models to fit the interferometric visibilities and closure phases. Our models include a smoothed ring, a flat disk with an inner cavity, and a 2D Gaussian. The models can account for disk inclination and for azimuthal asymmetries as well. We also perform numerical hydrodynamical simulations of the inner edge of the disk. Results. Our modeling reveals a significant brightness asymmetry in the L -band disk emission. The brightness maximum of the asymmetry is located at the NW part of the disk image, nearly at the position angle of the semimajor axis. The surface brightness ratio in the azimuthal variation is 3.5 ± 0.2. Comparing our result on the location of the asymmetry with other interferometric measurements, we confirm that the morphology of the r < 0.3 au disk region is time-variable. We propose that this asymmetric structure, located in or near the inner rim of the dusty disk, orbits the star. To find the physical origin of the asymmetry, we tested a hypothesis where a vortex is created by Rossby wave instability, and we find that a unique large-scale vortex may be compatible with our data. The half-light radius of the L -band-emitting region is 0.33 ±0.01 au, the inclination is 52° −7° +5° , and the position angle is 143° ± 3°. Our models predict that a non-negligible fraction of the L -band disk emission originates inside the dust sublimation radius for μ m-sized grains. Refractory grains or large (≳10 μ m-sized) grains could be the origin of this emission. N -band observations may also support a lack of small silicate grains in the innermost disk ( r ≲ 0.6 au), in agreement with our findings from L -band data.
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