Article (Scientific journals)
Hot circumstellar material resolved around β Pic with VLTI/PIONIER
Defrere, Denis; Lebreton, J.; Le Bouquin, J.-B. et al.
2012In Astronomy and Astrophysics, 546, p. 9
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http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201220287&Itemid=129 Copyright ESO 2012, published by EDP Sciences


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Keywords :
instrumentation: high angular resolution; techniques: interferometric; infrared: planetary systems
Abstract :
[en] Aims: We aim at resolving the circumstellar environment around β Pic in the near-infrared in order to study the inner planetary system (<200 mas, i.e., ~4 AU). Methods: Precise interferometric fringe visibility measurements were obtained over seven spectral channels dispersed across the H band with the four-telescope VLTI/PIONIER interferometer. Thorough analysis of interferometric data was performed to measure the stellar angular diameter and to search for circumstellar material. Results: We detected near-infrared circumstellar emission around β Pic that accounts for 1.37% ± 0.16% of the near-infrared stellar flux and that is located within the field-of-view of PIONIER (i.e., ~200 mas in radius). The flux ratio between this excess and the photosphere emission is shown to be stable over a period of 1 year and to vary only weakly across the H band, suggesting that the source is either very hot (≳1500 K) or dominated by the scattering of the stellar flux. In addition, we derive the limb-darkened angular diameter of β Pic with an unprecedented accuracy (θLD= 0.736 ± 0.019 mas). Conclusions: The presence of a small H-band excess originating in the vicinity of β Pic is revealed for the first time thanks to the high-precision visibilities enabled by VLTI/PIONIER. This excess emission is likely due to the scattering of stellar light by circumstellar dust and/or the thermal emission from a yet unknown population of hot dust, although hot gas emitting in the continuum cannot be firmly excluded.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Defrere, Denis ;  Max Planck Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany
Lebreton, J.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France
Le Bouquin, J.-B.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France
Lagrange, A.-M.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Augereau, J.-C.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France
Berger, J.-P.;  European Southern Observatory, Alonso de Cordova, 3107, Vitacura, Chile
di Folco, E.;  Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, UMR 5804, Floirac, France
Ertel, S.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France
Kluska, J.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France
Montagnier, G.;  European Southern Observatory, Alonso de Cordova, 3107, Vitacura, Chile
Millan-Gabet, R.;  NASA Exoplanet Science Institute (Caltech), MS 100-22, 770 South Wilson Avenue, Pasadena, CA, 91125, USA
Traub, W.;  Jet Propulsion Laboratory (NASA/JPL), MS 301-355, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
Zins, G.;  UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), UMR, 5274, France)
More authors (4 more) Less
Language :
English
Title :
Hot circumstellar material resolved around β Pic with VLTI/PIONIER
Publication date :
01 October 2012
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
546
Pages :
L9
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 January 2013

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