The GRAVITY young stellar object survey - II. First spatially resolved 
observations of the CO bandhead emission in a high-mass YSO

Garatti, A. Caratti o; Fedriani, R.; Lopez, R. Garcia; Koutoulaki, M.; Perraut, K.; Linz, H.; Brandner, W.; Garcia, P.; Klarmann, L.; Henning, T.; Labadie, L.; Sanchez-Bermudez, J.; Lazareff, B.; Van Dishoeck, E. F.; Caselli, P.; de Zeeuw, P. T.; Bik, A.; Benisty, M.; Dougados, C.; Ray, T. P.; Amorim, A.; Berger, J.-P.; Clénet, Y.; du Foresto, V. Coudé; Duvert, G.; Eckart, A.; Eisenhauer, F.; Gao, F.; Gendron, E.; Genzel, R.; Gillessen, S.; Gordo, P.; Jocou, L.; Horrobin, M.; Kervella, P.; Lacour, S.; Le Bouquin, J.-B.; Léna, P.; Grellmann, R.; Ott, T.; Paumard, T.; Perrin, G.; Rousset, G.; Scheithauer, S.; Shangguan, J.; Stadler, J.; Straub, O.; Straubmeier, C.; Sturm, E.; Thi, W. F.; Vincent, F. H.; Widmann, F.

doi:10.1051/0004-6361/202037583

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

The GRAVITY young stellar object survey - II. First spatially resolved observations of the CO bandhead emission in a high-mass YSO

MPS-Authors

/persons/resource/persons4714

Van Dishoeck, E. F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons133043

Caselli, P.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons225865

de Zeeuw, P. T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4766

Eisenhauer, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214427

Gao, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4590

Genzel, R.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4768

Gillessen, S.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons16190

Ott, T.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232571

Shangguan, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons248280

Stadler, J.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons232635

Straub, O.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons4650

Sturm, E.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons172897

Thi, W. F.
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

/persons/resource/persons214431

Widmann, F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Garatti, A. C. o., Fedriani, R., Lopez, R. G., Koutoulaki, M., Perraut, K., Linz, H., et al. (2020). The GRAVITY young stellar object survey - II. First spatially resolved observations of the CO bandhead emission in a high-mass YSO. Astronomy and Astrophysics, 635: L12. doi:10.1051/0004-6361/202037583.

Cite as: https://hdl.handle.net/21.11116/0000-0006-97CA-C

Abstract

Context. The inner regions of the discs of high-mass young stellar objects (HMYSOs) are still poorly known due to the small angular scales and the high visual extinction involved.
Aims. We deploy near-infrared spectro-interferometry to probe the inner gaseous disc in HMYSOs and investigate the origin and physical characteristics of the CO bandhead emission (2.3–2.4 μm).
Methods. We present the first GRAVITY/VLTI observations at high spectral (ℛ = 4000) and spatial (mas) resolution of the CO overtone transitions in NGC 2024 IRS 2.
Results. The continuum emission is resolved in all baselines and is slightly asymmetric, displaying small closure phases (≤8°). Our best ellipsoid model provides a disc inclination of 34° ±1°, a disc major axis position angle (PA) of 166° ± 1°, and a disc diameter of 3.99 ± 0.09 mas (or 1.69 ± 0.04 au, at a distance of 423 pc). The small closure phase signals in the continuum are modelled with a skewed rim, originating from a pure inclination effect. For the first time, our observations spatially and spectrally resolve the first four CO bandheads. Changes in visibility, as well as differential and closure phases across the bandheads are detected. Both the size and geometry of the CO-emitting region are determined by fitting a bidimensional Gaussian to the continuum-compensated CO bandhead visibilities. The CO-emitting region has a diameter of 2.74±_0.07 ^0.08 mas (1.16 ± 0.03 au), and is located in the inner gaseous disc, well within the dusty rim, with inclination and PA matching the dusty disc geometry, which indicates that both dusty and gaseous discs are coplanar. Physical and dynamical gas conditions are inferred by modelling the CO spectrum. Finally, we derive a direct measurement of the stellar mass of M_* ∼ 14.7_−3.6 ⁺² M_⊙ by combining our interferometric and spectral modelling results.