The GRAVITY young stellar object survey: IV. The CO overtone emission in 51 Oph at sub-au scales
Author
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Koutoulaki, M.
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García López, R.
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Natta, A.
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Fedriani, R.
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Garatti, A. Caratti O.
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Ray, T. P.
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Coffey, D.
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Brandner, W.
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Dougados, C.
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García, P. J. V.
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Klarmann, L.
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Labadie, L.
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Perraut, K.
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Sánchez Bermúdez, J.
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Lin, C. C.
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Amorim, A.
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Bauböck, M.
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Benisty, Myriam
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Berger, J. P.
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Buron, A.
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Caselli, P.
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Clénet, Y.
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Coudé Du Foresto, V.
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De Zeeuw, P. T.
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Duvert, G.
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De Wit, W.
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Eckart, A.
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Eisenhauer, F.
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Filho, M.
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Gao, F.
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Gendron, E.
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Genzel, R.
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Gillessen, S.
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Grellmann, R.
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Habibi, M.
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Haubois, X.
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Haussmann, F.
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Henning, T.
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Hippler, S.
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Hubert, Z.
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Horrobin, M.
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Jiménez Rosales, A.
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Jocou, L.
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Kervella, P.
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Kolb, J.
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Lacour, S.
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Le Bouquin, J. B.
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Léna, P.
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Linz, H.
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Ott, T.
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Paumard, T.
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Perrin, G.
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Pfuhl, O.
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Ramírez Tannus, M. C.
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Rau, C.
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Rousset, G.
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Scheithauer, S.
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Shangguan, J.
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Stadler, J.
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Straub, O.
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Straubmeier, C.
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Sturm, E.
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Van Dishoeck, E.
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Vincent, F.
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Von Fellenberg, S.
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Widmann, F.
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Wieprecht, E.
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Wiest, M.
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Wiezorrek, E.
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Yazici, S.
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Zins, G.
Admission date
dc.date.accessioned
2022-04-04T19:46:32Z
Available date
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2022-04-04T19:46:32Z
Publication date
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2021
Cita de ítem
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A&A 645, A50 (2021)
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Identifier
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10.1051/0004-6361/202038000
Identifier
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https://repositorio.uchile.cl/handle/2250/184672
Abstract
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Context. 51 Oph is a Herbig Ae/Be star that exhibits strong near-infrared CO ro-vibrational emission at 2.3 mu m, most likely originating in the innermost regions of a circumstellar disc.Aims. We aim to obtain the physical and geometrical properties of the system by spatially resolving the circumstellar environment of the inner gaseous disc.Methods. We used the second-generation Very Large Telescope Interferometer instrument GRAVITY to spatially resolve the continuum and the CO overtone emission. We obtained data over 12 baselines with the auxiliary telescopes and derive visibilities, and the differential and closure phases as a function of wavelength. We used a simple local thermal equilibrium ring model of the CO emission to reproduce the spectrum and CO line displacements.Results. Our interferometric data show that the star is marginally resolved at our spatial resolution, with a radius of similar to 10.58 2.65R(circle dot). The K-band continuum emission from the disc is inclined by 63 degrees +/- 1 degrees, with a position angle of 116 degrees +/- 1 degrees, and 4 +/- 0.8 mas (0.5 +/- 0.1 au) across. The visibilities increase within the CO line emission, indicating that the CO is emitted within the dust-sublimation radius. By modelling the CO bandhead spectrum, we derive that the CO is emitted from a hot (T = 1900-2800 K) and dense (N-CO = (0.9-9) x 10(21) cm(-2)) gas. The analysis of the CO line displacement with respect to the continuum allows us to infer that the CO is emitted from a region 0.10 +/- 0.02 au across, well within the dust-sublimation radius. The inclination and position angle of the CO line emitting region is consistent with that of the dusty disc.Conclusions. Our spatially resolved interferometric observations confirm the CO ro-vibrational emission within the dust-free region of the inner disc. Conventional disc models exclude the presence of CO in the dust-depleted regions of Herbig AeBe stars. Ad hoc models of the innermost disc regions, that can compute the properties of the dust-free inner disc, are therefore required.
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Patrocinador
dc.description.sponsorship
Irish Research Council for Science, Engineering and Technology GOIPG/2016/769
Science Foundation Ireland 13/ERC/12907
German Research Foundation (DFG)
European Commission FOR2634/1TE1024/1-1
Science Foundation Ireland
European Commission 13/ERC/12907
18/SIRG/5597
European Research Council (ERC) 743029
Portuguese Foundation for Science and Technology
European Commission UIDB/00099/2020
SFRH/BSAB/142940/2018
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Lenguage
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en
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Publisher
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EDP Sciences
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Type of license
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 United States