The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars
Artikel i vetenskaplig tidskrift, 2024
Context. The region of protoplanetary disks closest to a star (within 1–2 au) is shaped by a number of different processes, from accretion of the disk material onto the central star to ejection in the form of winds and jets. Optical and near-IR emission lines are potentially good tracers of inner disk processes if very high spatial and/or spectral resolution are achieved. Aims. In this paper, we exploit the capabilities of the VLTI-GRAVITY near-IR interferometer to determine the location and kinematics of the hydrogen emission line Brγ. Methods. We present VLTI-GRAVITY observations of the Brγ line for a sample of 26 stars of intermediate mass (HAEBE), the largest sample so far analysed with near-IR interferometry. Results. The Brγ line was detected in 17 objects. The emission is very compact (in most cases only marginally resolved), with a size of 10–30 R∗(1–5 mas). About half of the total flux comes from even smaller regions, which are unresolved in our data. For eight objects, it was possible to determine the position angle (PA) of the line-emitting region, which is generally in agreement with that of the inner-dusty disk emitting the K-band continuum. The position-velocity pattern of the Brγ line-emitting region of the sampled objects is roughly consistent with Keplerian rotation. The exception is HD 45677, which shows more extended emission and more complex kinematics. The most likely scenario for the Brγ origin is that the emission comes from an MHD wind launched very close to the central star, in a region well within the dust sublimation radius. An origin in the bound gas layer at the disk surface cannot be ruled out, while accreting matter provides only a minor fraction of the total flux. Conclusions. These results show the potential of near-IR spectro-interferometry to study line emission in young stellar objects.
circumstellar matter
stars: formation
techniques: interferometric
stars: variables: T Tauri, Herbig Ae/Be
Författare
R. Garcia-Lopez
Max-Planck-Gesellschaft
University College Dublin
A. Natta
Dublin Institute for Advanced Studies
Rubén Fedriani
Instituto de Astrofisica de Andalucía (IAA)
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
A. Caratti o. Garatti
Osservatorio Astronomico di Capodimonte
Max-Planck-Gesellschaft
J. Sanchez-Bermudez
Universidad Nacional Autónoma de México
Max-Planck-Gesellschaft
K. Perraut
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
C. Dougados
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
Y. I. Bouarour
University College Dublin
J. Bouvier
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
W. Brandner
Max-Planck-Gesellschaft
P. Garcia
Instituto Superior Tecnico
Universidade do Porto
M. Koutoulaki
University of Leeds
L. Labadie
Universität zu Köln
H. Linz
Max-Planck-Gesellschaft
E. Alécian
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
M. Benisty
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
J. P. Berger
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
G. Bourdarot
Max-Planck-Gesellschaft
P. Caselli
Max-Planck-Gesellschaft
Y. Clénet
Observatoire de Paris
P. T. De Zeeuw
Universiteit Leiden
R. I. Davies
Max-Planck-Gesellschaft
A. Eckart
Max-Planck-Gesellschaft
Universität zu Köln
F. Eisenhauer
Max-Planck-Gesellschaft
N. M. Förster-Schreiber
Max-Planck-Gesellschaft
E. Gendron
Observatoire de Paris
S. Gillessen
Max-Planck-Gesellschaft
Sierra L. Grant
Max-Planck-Gesellschaft
T. Henning
Max-Planck-Gesellschaft
P. Kervella
Observatoire de Paris
S. Lacour
Observatoire de Paris
V. Lapeyrère
Observatoire de Paris
J. B. Le Bouquin
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
D. Lutz
Max-Planck-Gesellschaft
F. Mang
Max-Planck-Gesellschaft
H. Nowacki
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
T. Ott
Max-Planck-Gesellschaft
T. Paumard
Observatoire de Paris
G. Perrin
Observatoire de Paris
J. Shangguan
Max-Planck-Gesellschaft
T. Shimizu
Max-Planck-Gesellschaft
A. Soulain
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
C. Straubmeier
Universität zu Köln
E. Sturm
Max-Planck-Gesellschaft
L. J. Tacconi
Max-Planck-Gesellschaft
E. F. van Dishoeck
Universiteit Leiden
F. Vincent
Observatoire de Paris
F. Widmann
Max-Planck-Gesellschaft
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 684 A43Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202245804