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The Asymmetric Inner Disk of the Herbig Ae Star HD 163296 in the Eyes of VLTI/MATISSE: Evidence for a Vortex?Context.A complex environment exists in the inner few astronomical units of planet-forming disks. High-angular-resolution observa-tions 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-massstar HD 163296 from early VLTI/MATISSE observations taken in theL- andN-bands. We put special emphasis on the detection ofpotential disk asymmetries.Methods.We use simple geometric models to fit the interferometric visibilities and closure phases. Our models include a smoothedring, a flat disk with an inner cavity, and a 2D Gaussian. The models can account for disk inclination and for azimuthal asymmetriesas well. We also perform numerical hydrodynamical simulations of the inner edge of the disk.Results.Our modeling reveals a significant brightness asymmetry in theL-band disk emission. The brightness maximum of the asym-metry is located at the NW part of the disk image, nearly at the position angle of the semimajor axis. The surface brightness ratio inthe azimuthal variation is3.5±0.2. Comparing our result on the location of the asymmetry with other interferometric measurements,we confirm that the morphology of ther<0.3au disk region is time-variable. We propose that this asymmetric structure, located in ornear the inner rim of the dusty disk, orbits the star. To find the physical origin of the asymmetry, we tested a hypothesis where a vortexis created by Rossby wave instability, and we find that a unique large-scale vortex may be compatible with our data. The half-lightradius of theL-band-emitting region is0.33±0.01au, the inclination is52◦+5◦−7◦, and the position angle is143◦±3◦. Our models predictthat a non-negligible fraction of theL-band disk emission originates inside the dust sublimation radius forμm-sized grains. Refractorygrains or large (&10μm-sized) grains could be the origin of this emission.N-band observations may also support a lack of smallsilicate grains in the innermost disk (r.0.6au), in agreement with our findings fromL-band data.
Document ID
20210024550
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
J Varga
(Leiden University Leiden, Netherlands)
M Hogerheijde
(Leiden University Leiden, Netherlands)
R van Boekel
(Université Côte d'Azur Nice, France)
L Klarmann
(Université Côte d'Azur Nice, France)
R Petrov
(Université Côte d'Azur Nice, France)
L B F M Waters
(Radboud University Nijmegen Nijmegen, Gelderland, Netherlands)
S Lagarde
(Université Côte d'Azur Nice, France)
E Pantin
(Paris Diderot University Paris, France)
Ph Berio
(Université Côte d'Azur Nice, France)
G Weigelt
(Max Planck Institute for Radio Astronomy Bonn, Germany)
S Robbe-Dubois
(Université Côte d'Azur Nice, France)
B Lopez
(Université Côte d'Azur Nice, France)
F Millour
(Université Côte d'Azur Nice, France)
J-C Augereau ORCID
(Grenoble Alpes University Saint-Martin-d'Hères, France)
H Meheut
(Université Côte d'Azur Nice, France)
A Meilland
(Université Côte d'Azur Nice, France)
Th Henning
(Max Planck Institute for Astronomy Heidelberg, Germany)
W Jaffe
(Leiden University Leiden, Netherlands)
F Bettonvil
(ASTRON)
P Bristow
(European Southern Observatory Garching bei München, Germany)
K-H Hofmann
(Max Planck Institute for Radio Astronomy Bonn, Germany)
A Matter
(Université Côte d'Azur Nice, France)
G Zins
(European Southern Observatory Santiago, Chile)
S Wolf
(Christian-Albrechts University in Kiel)
F Allouche
(Université Côte d'Azur Nice, France)
F Donnan
(Leiden University Leiden, Netherlands)
D Schertl
(Max Planck Institute for Radio Astronomy Bonn, Germany)
C Dominik
(University of Amsterdam Amsterdam, Noord-Holland, Netherlands)
M Heininger
(Max Planck Institute for Radio Astronomy Bonn, Germany)
M Lehmitz
(Max Planck Institute for Astronomy Heidelberg, Germany)
P Cruzalebes
(Université Côte d'Azur Nice, France)
A Glindermann
(European Southern Observatory Garching bei München, Germany)
K Meisenheimer
(Max Planck Institute for Astronomy Heidelberg, Germany)
C Paladini
(European Southern Observatory Santiago, Chile)
M Scholler
(European Southern Observatory Garching bei München, Germany)
J Woillez
(European Southern Observatory Garching bei München, Germany)
L Venema
(ASTRON)
E Kokoulina
(Université Côte d'Azur Nice, France)
G Yoffe
(Max Planck Institute for Astronomy Heidelberg, Germany)
P Abraham
(Konkoly Thege Miklós Astronomical Institute Budapest, Hungary)
S Abadie
(European Southern Observatory Santiago, Chile)
R Abuter
(European Southern Observatory Garching bei München, Germany)
M Accardo
(European Southern Observatory Garching bei München, Germany)
T Adler
(Max Planck Institute for Astronomy Heidelberg, Germany)
T Agocs
(ASTRON)
P Antonelli
(Université Côte d'Azur Nice, France)
A Bohm
(Max Planck Institute for Astronomy Heidelberg, Germany)
C Bailet
(Université Côte d'Azur Nice, France)
G Bazin
(European Southern Observatory Garching bei München, Germany)
U Beckmann
(Max Planck Institute for Radio Astronomy Bonn, Germany)
J Beltran
(European Southern Observatory Santiago, Chile)
W Boland
(Leiden University Leiden, Netherlands)
P Bourget
(European Southern Observatory Santiago, Chile)
R Brast
(European Southern Observatory Garching bei München, Germany)
Y Bresson
(Université Côte d'Azur Nice, France)
L Burtscher
(Leiden University Leiden, Netherlands)
R Castillo
(European Southern Observatory Santiago, Chile)
A Chelli
(Université Côte d'Azur Nice, France)
C Cid
(European Southern Observatory Santiago, Chile)
J-M Clausse
(Université Côte d'Azur Nice, France)
C Connot
(Max Planck Institute for Radio Astronomy Bonn, Germany)
R D Conzelmann
(European Southern Observatory Garching bei München, Germany)
W-C Danchi
(Goddard Space Flight Center Greenbelt, Maryland, United States)
M De Hann
(ASTRON)
M Delbo
(Université Côte d'Azur Nice, France)
M Ebert
(Max Planck Institute for Astronomy Heidelberg, Germany)
E Elswijk
(ASTRON)
Y Fantei
(Université Côte d'Azur Nice, France)
R Frahm
(European Southern Observatory Garching bei München, Germany)
V Gamez Rosas
(Leiden University Leiden, Netherlands)
A Gabasch
(European Southern Observatory Garching bei München, Germany)
A Gallenne
(Catholic University of the Most Holy Conception Concepción, Chile)
E Garces
(European Southern Observatory Santiago, Chile)
P Girard
(Université Côte d'Azur Nice, France)
F Y J Gonte
(European Southern Observatory Garching bei München, Germany)
J C Gonzalez Herrera
(European Southern Observatory Garching bei München, Germany)
U Graser
(Max Planck Institute for Astronomy Heidelberg, Germany)
P Guajardo
(European Southern Observatory Santiago, Chile)
F Guitton
(Université Côte d'Azur Nice, France)
X Haubois
(European Southern Observatory Santiago, Chile)
J Hron
(University of Vienna Vienna, Austria)
N Hubin
(European Southern Observatory Garching bei München, Germany)
R Huerta
(European Southern Observatory Santiago, Chile)
J W Isbell
(Max Planck Institute for Astronomy Heidelberg, Germany)
D Ives
(European Southern Observatory Garching bei München, Germany)
G Jakob
(European Southern Observatory Garching bei München, Germany)
A Jasko
(Konkoly Thege Miklós Astronomical Institute Budapest, Hungary)
L Jochum
(Konkoly Thege Miklós Astronomical Institute Budapest, Hungary)
R Klein
(Max Planck Institute for Astronomy Heidelberg, Germany)
J Kragt
(ASTRON)
G Kroes
(ASTRON)
S Kuindersma
(ASTRON)
L Labadie
(Universität zu Köln)
W Laun
(Max Planck Institute for Astronomy Heidelberg, Germany)
R Le Poole
(Leiden University Leiden, Netherlands)
C Leinert
(Max Planck Institute for Astronomy Heidelberg, Germany)
J-L Lizon
(European Southern Observatory Garching bei München, Germany)
M Lopez
(European Southern Observatory Santiago, Chile)
A Merand
(European Southern Observatory Garching bei München, Germany)
A Marcotto
(Université Côte d'Azur Nice, France)
N Mauclert
(Université Côte d'Azur Nice, France)
T Maurer
(Max Planck Institute for Astronomy Heidelberg, Germany)
L H Mehrgan
(European Southern Observatory Garching bei München, Germany)
J Meisner
(Leiden University Leiden, Netherlands)
K Meixner
(Max Planck Institute for Astronomy Heidelberg, Germany)
M Mellein
(Max Planck Institute for Astronomy Heidelberg, Germany)
L Mohr
(Max Planck Institute for Astronomy Heidelberg, Germany)
S Morel
(Université Côte d'Azur Nice, France)
L Mosoni
(Zselic Park of Stars)
R Navarro
(ASTRON)
U Neumann
(Max Planck Institute for Astronomy Heidelberg, Germany)
E NuBbaum
(Max Planck Institute for Radio Astronomy Bonn, Germany)
L Pallanca
(European Southern Observatory Santiago, Chile)
L Pasquini
(European Southern Observatory Garching bei München, Germany)
I Percheron
(European Southern Observatory Garching bei München, Germany)
J-U Pott
(Max Planck Institute for Astronomy Heidelberg, Germany)
E Ponza
(European Southern Observatory Garching bei München, Germany)
A Ridinger
(Max Planck Institute for Astronomy Heidelberg, Germany)
F Rigal
(ASTRON)
M Riquelme
(European Southern Observatory Santiago, Chile)
Th Rivinius
(European Southern Observatory Santiago, Chile)
R Roelfsema
(ASTRON)
R-R Rohloff
(Max Planck Institute for Astronomy Heidelberg, Germany)
S Rousseau
(Université Côte d'Azur Nice, France)
N Schuhler
(European Southern Observatory Santiago, Chile)
M Schuil
(ASTRON)
A Soulain
(University of Sydney Sydney, New South Wales, Australia)
P Stee
(Université Côte d'Azur Nice, France)
C Stephan
(European Southern Observatory Santiago, Chile)
R ter Horst
(ASTRON)
N Tromp
(ASTRON)
F Vakili
(Université Côte d'Azur Nice, France)
A van Duin
(ASTRON)
J Vinther
(European Southern Observatory Garching bei München, Germany)
M Wittkowski
(European Southern Observatory Garching bei München, Germany)
F Wrhel
(Max Planck Institute for Astronomy Heidelberg, Germany)
Date Acquired
November 18, 2021
Publication Date
March 9, 2021
Publication Information
Publication: Astronomy & Astrophysics
Publisher: EDP Sciences
Volume: 647
Issue Publication Date: January 1, 2021
ISSN: 0004-6361
e-ISSN: 1432-0746
Subject Category
Astronomy
Funding Number(s)
WBS: 399131.02.01.03.16
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
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