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

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-97CA-C Version Permalink: http://hdl.handle.net/21.11116/0000-0006-97CB-B
Genre: Journal Article

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Garatti, A. Caratti o, Author
Fedriani, R., Author
Lopez, R. Garcia, Author
Koutoulaki, M., Author
Perraut, K., Author
Linz, H., Author
Brandner, W., Author
Garcia, P., Author
Klarmann, L., Author
Henning, T., Author
Labadie, L., Author
Sanchez-Bermudez, J., Author
Lazareff, B., Author
Van Dishoeck, E. F.1, Author              
Caselli, P.2, Author              
de Zeeuw, P. T.1, Author              
Bik, A., Author
Benisty, M., Author
Dougados, C., Author
Ray, T. P., Author
Amorim, A., AuthorBerger, J.-P., AuthorClénet, Y., Authordu Foresto, V. Coudé, AuthorDuvert, G., AuthorEckart, A., AuthorEisenhauer, F.1, Author              Gao, F.1, Author              Gendron, E., AuthorGenzel, R.1, Author              Gillessen, S.1, Author              Gordo, P., AuthorJocou, L., AuthorHorrobin, M., AuthorKervella, P., AuthorLacour, S., AuthorLe Bouquin, J.-B., AuthorLéna, P., AuthorGrellmann, R., AuthorOtt, T.1, Author              Paumard, T., AuthorPerrin, G., AuthorRousset, G., AuthorScheithauer, S., AuthorShangguan, J.1, Author              Stadler, J.1, Author              Straub, O.1, Author              Straubmeier, C., AuthorSturm, E.1, Author              Thi, W. F.2, Author              Vincent, F. H., AuthorWidmann, F.1, Author               more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 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.

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Language(s): eng - English
 Dates: 2020-03-24
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/202037583
Other: LOCALID: 3239229
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 635 Sequence Number: L12 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1