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  The GRAVITY young stellar object survey: IV. The CO overtone emission in 51 Oph at sub-au scales

Koutoulaki, M., Lopez, R. G., Natta, A., Fedriani, R., Garatti, A. C. o., Ray, T. P., et al. (2021). The GRAVITY young stellar object survey: IV. The CO overtone emission in 51 Oph at sub-au scales. Astronomy and Astrophysics, 645: A50. doi:10.1051/0004-6361/202038000.

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The GRAVITY young stellar object survey IV. The CO overtone emission in 51 Oph at sub-au scales.pdf (beliebiger Volltext), 8MB
 
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Koutoulaki, M., Autor
Lopez, R. Garcia, Autor
Natta, A., Autor
Fedriani, R., Autor
Garatti, A. Caratti o, Autor
Ray, T. P., Autor
Coffey, D., Autor
Brandner, W., Autor
Dougados, C., Autor
Garcia, P. J. V., Autor
Klarmann, L., Autor
Labadie, L., Autor
Perraut, K., Autor
Sanchez-Bermudez, J., Autor
Lin, C.-C., Autor
Amorim, A., Autor
Bauböck, M.1, Autor           
Benisty, M., Autor
Berger, J. P., Autor
Buron, A.2, Autor           
Caselli, P.3, Autor           Clénet, Y., Autordu Foresto, V. Coudé, Autorde Zeeuw, P. T.1, Autor           Duvert, G., Autorde Wit, W., AutorEckart, A., AutorEisenhauer, F.1, Autor           Filho, M., AutorGao, F.1, Autor           Gendron, E., AutorGenzel, R.1, Autor           Gillessen, S.1, Autor           Grellmann, R., AutorHabibi, M.1, Autor           Haubois, X., AutorHaussmann, F.1, Autor           Henning, T., AutorHippler, S., AutorHubert, Z., AutorHorrobin, M., AutorJimenez Rosales, A.1, Autor           Jocou, L., AutorKervella, P., AutorKolb, J., AutorLacour, S., AutorLe Bouquin, J.-B., AutorLéna, P., AutorLinz, H., AutorOtt, T.1, Autor           Paumard, T., AutorPerrin, G., AutorPfuhl, O., AutorRamírez-Tannus, M. C., AutorRau, C.2, Autor           Rousset, G., AutorScheithauer, S., AutorShangguan, J.1, Autor           Stadler, J.1, Autor           Straub, O.1, Autor           Straubmeier, C., AutorSturm, E.1, Autor           Dishoeck, E. van1, Autor           Vincent, F., AutorFellenberg, S. von1, Autor           Widmann, F.1, Autor           Wieprecht, E.1, Autor           Wiest, M., AutorWiezorrek, E.1, Autor           Yazici, S.1, Autor           Zins, G., Autor mehr..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2MPI for Extraterrestrial Physics, Max Planck Society, ou_159888              
3Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Zusammenfassung: Context. 51 Oph is a Herbig Ae/Be star that exhibits strong near-infrared CO ro-vibrational emission at 2.3 μm, 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 ~10.58 ± 2.65R. The K-band continuum emission from the disc is inclined by 63° ± 1°, with a position angle of 116° ± 1°, 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 (NCO = (0.9–9) × 1021 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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Sprache(n): eng - English
 Datum: 2021-01-07
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1051/0004-6361/202038000
Anderer: LOCALID: 3289603
 Art des Abschluß: -

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Titel: Astronomy and Astrophysics
  Andere : Astron. Astrophys.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: France : EDP Sciences S A
Seiten: - Band / Heft: 645 Artikelnummer: A50 Start- / Endseite: - Identifikator: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1