The VLTI/PIONIER near-infrared interferometric survey of southern T Tauri stars
Author
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Anthonioz, F.
Author
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Ménard, Francois
Author
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Pinte, Christophe
Author
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Le Bouquin, J. B.
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Benisty, Myriam
Author
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Thi, W. F.
Author
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Absil, Olivier
Author
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Duchêne, G.
Author
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Augereau, J. C.
Author
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Berger, J. P.
Author
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Casassus Montero, Simón
Author
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Duvert, G.
Author
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Lazare, B.
Author
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Malbet, F.
Author
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Millan Gabet, R.
Author
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Schreiber, M. R.
Author
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Traub, W.
Author
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Zins, G.
Admission date
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2015-08-07T14:42:28Z
Available date
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2015-08-07T14:42:28Z
Publication date
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2015
Cita de ítem
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Astronomy & Astrophysics 574, A41 (2015)
en_US
Identifier
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1432-0746
Identifier
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10.1051/0004-6361/201424520
Identifier
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https://repositorio.uchile.cl/handle/2250/132484
Abstract
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Context. The properties of the inner disks of bright Herbig AeBe stars have been studied with near-infrared (NIR) interferometry
and high resolution spectroscopy. The continuum (dust) and a few molecular gas species have been studied close to the central star;
however, sensitivity problems limit direct information about the inner disks of the fainter T Tauri stars.
Aims. Our aim is to measure some of the properties (inner radius, brightness profile, shape) of the inner regions of circumstellar disk
surrounding southern T Tauri stars.
Methods. We performed a survey with the VLTI/PIONIER recombiner instrument at H-band of 21 T Tauri stars. The baselines used
ranged from 11 m to 129 m, corresponding to a maximum resolution of 3 mas ( 0.45 au at 150 pc).
Results. Thirteen disks are resolved well and the visibility curves are fullysampled as a function of baseline in the range 45–130 m
for these 13 objects. A simple qualitative examination of visibility profiles allows us to identify a rapid drop-o in the visibilities at
short baselines(<10 M ) in 8 resolved disks. This is indicative of a significant contribution from an extended (R > 3 au, at 150 pc)
contribution of light from the disk. We demonstrate that this component is compatible with scattered light, providing strong support
to an earlier prediction. The amplitude of the drop-o and the amount of dust thermal emission changes from source to source
suggesting that each disk is di erent. A by-product of the survey is the identification of a new milli-arcsec separation binary: WW
Cha. Spectroscopic and interferometric data of AK Sco have also been fitted with a binary + disk model.
Conclusions. The visibility data are reproduced well when thermal emission and scattering from dust are fully considered. The inner
radii measured are consistent with the expected dust sublimation radii. The modelling of AK Sco suggests a likely coplanarity between
the disk and the binary’s orbital plane.
en_US
Patrocinador
dc.description.sponsorship
European Commission’s 7th
framework programme (EC FP7) under grant agreement No. 284405 (DIANA)
and contract PERG06-GA-2009-256513 and also from Agence Nationale pour
la Recherche (ANR) of France under contract ANR-2010-JCJC-0504-01 and Millennium Science Initiative, Chilean
Ministry of Economy: Nucleus P10-022-F