Buchumschlag

The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars

Fuente: arXiv

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	GRAVITY Collaboration, Lopez, R. Garcia, Natta, A., Fedriani, R., Garatti, A. Caratti o, Sanchez-Bermudez, J., Perraut, K., Dougados, C., Bouarour, Y. -I., Bouvier, J., Brandner, W., Garcia, P., Koutoulaki, M., Labadie, L., Linz, H., Al'ecian, E., Benisty, M., Berger, J. -P., Bourdarot, G., Caselli, P., Clenet, Y., de Zeeuw, P. T., Davies, R., Eckart, A., Eisenhauer, F., Forster-Schreiber, N. M., Gendron, E., Gillessen, S., Grant, S., Henning, Th., Kervella, P., Lacour, S., Lapeyrère, V., Bouquin, J. -B. Le, Lutz, D., Mang, F., Nowacki, H., Ott, T., Paumard, T., Perrin, G., Shangguan, J., Shimizu, T., Soulain, A., Straubmeier, C., Sturm, E., Tacconi, L., van Dishoeck, E. F., Vincent, F., Widmann, F.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Solar and Stellar Astrophysics Astrophysics of Galaxies
Online-Zugang:	Acceder al recurso
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

_version_	1866929210375798784
author	GRAVITY Collaboration Lopez, R. Garcia Natta, A. Fedriani, R. Garatti, A. Caratti o Sanchez-Bermudez, J. Perraut, K. Dougados, C. Bouarour, Y. -I. Bouvier, J. Brandner, W. Garcia, P. Koutoulaki, M. Labadie, L. Linz, H. Al'ecian, E. Benisty, M. Berger, J. -P. Bourdarot, G. Caselli, P. Clenet, Y. de Zeeuw, P. T. Davies, R. Eckart, A. Eisenhauer, F. Forster-Schreiber, N. M. Gendron, E. Gillessen, S. Grant, S. Henning, Th. Kervella, P. Lacour, S. Lapeyrère, V. Bouquin, J. -B. Le Lutz, D. Mang, F. Nowacki, H. Ott, T. Paumard, T. Perrin, G. Shangguan, J. Shimizu, T. Soulain, A. Straubmeier, C. Sturm, E. Tacconi, L. van Dishoeck, E. F. Vincent, F. Widmann, F.
author_facet	GRAVITY Collaboration Lopez, R. Garcia Natta, A. Fedriani, R. Garatti, A. Caratti o Sanchez-Bermudez, J. Perraut, K. Dougados, C. Bouarour, Y. -I. Bouvier, J. Brandner, W. Garcia, P. Koutoulaki, M. Labadie, L. Linz, H. Al'ecian, E. Benisty, M. Berger, J. -P. Bourdarot, G. Caselli, P. Clenet, Y. de Zeeuw, P. T. Davies, R. Eckart, A. Eisenhauer, F. Forster-Schreiber, N. M. Gendron, E. Gillessen, S. Grant, S. Henning, Th. Kervella, P. Lacour, S. Lapeyrère, V. Bouquin, J. -B. Le Lutz, D. Mang, F. Nowacki, H. Ott, T. Paumard, T. Perrin, G. Shangguan, J. Shimizu, T. Soulain, A. Straubmeier, C. Sturm, E. Tacconi, L. van Dishoeck, E. F. Vincent, F. Widmann, F.
contents	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. 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 Bracket gamma. We present VLTI-GRAVITY observations of the Bracket gamma line for a sample of 26 stars of intermediate mass (HAEBE), the largest sample so far analysed with near-IR interferometry. The Bracket gamma line was detected in 17 objects. The emission is very compact (in most cases only marginally resolved), with a size of 10-30R* (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 Bracket gamma 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 Bracket gamma 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. These results show the potential of near-IR spectro-interferometry to study line emission in young stellar objects.
format	Preprint
id	arxiv_https___arxiv_org_abs_2401_07921
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars GRAVITY Collaboration Lopez, R. Garcia Natta, A. Fedriani, R. Garatti, A. Caratti o Sanchez-Bermudez, J. Perraut, K. Dougados, C. Bouarour, Y. -I. Bouvier, J. Brandner, W. Garcia, P. Koutoulaki, M. Labadie, L. Linz, H. Al'ecian, E. Benisty, M. Berger, J. -P. Bourdarot, G. Caselli, P. Clenet, Y. de Zeeuw, P. T. Davies, R. Eckart, A. Eisenhauer, F. Forster-Schreiber, N. M. Gendron, E. Gillessen, S. Grant, S. Henning, Th. Kervella, P. Lacour, S. Lapeyrère, V. Bouquin, J. -B. Le Lutz, D. Mang, F. Nowacki, H. Ott, T. Paumard, T. Perrin, G. Shangguan, J. Shimizu, T. Soulain, A. Straubmeier, C. Sturm, E. Tacconi, L. van Dishoeck, E. F. Vincent, F. Widmann, F. Solar and Stellar Astrophysics Astrophysics of Galaxies 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. 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 Bracket gamma. We present VLTI-GRAVITY observations of the Bracket gamma line for a sample of 26 stars of intermediate mass (HAEBE), the largest sample so far analysed with near-IR interferometry. The Bracket gamma line was detected in 17 objects. The emission is very compact (in most cases only marginally resolved), with a size of 10-30R* (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 Bracket gamma 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 Bracket gamma 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. These results show the potential of near-IR spectro-interferometry to study line emission in young stellar objects.
title	The GRAVITY young stellar object survey XII. The hot gas disk component in Herbig Ae/Be stars
topic	Solar and Stellar Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2401.07921