Reference : Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/16576
Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
English
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
di Folco, E. [LESIA, UMR8109, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France ; Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland]
Mérand, A. [LESIA, UMR8109, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France]
Augereau, J.-C. [Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR CNRS/UJF 5571, BP 53, 38041 Grenoble Cedex 9, France]
Coudé Du Foresto, V. [LESIA, UMR8109, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France]
Aufdenberg, J. P. [National Optical Astronomical Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA]
Kervella, P. [LESIA, UMR8109, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France]
Ridgway, S. T. [National Optical Astronomical Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA ; Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
Berger, D. H. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
Ten Brummelaar, T. A. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
Sturmann, J. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
Sturmann, L. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
Turner, N. H. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
McAlister, H. A. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
1-Jun-2006
Astronomy and Astrophysics
EDP Sciences
452
237-244
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] stars: individual: Vega ; circumstellar matter ; techniques: interferometric
[en] Context: Only a handful of debris disks have been imaged up to now. Due to the need for high dynamic range and high angular resolution, very little is known about the inner planetary region, where small amounts of warm dust are expected to be found. Aims: We investigate the close neighbourhood of Vega with the help of infrared stellar interferometry and estimate the integrated K-band flux originating from the central 8 AU of the debris disk. Methods: We performed precise visibility measurements at both short (~30 m) and long (~150 m) baselines with the FLUOR beam-combiner installed at the CHARA Array (Mt Wilson, California) in order to separately resolve the emissions from the extended debris disk (short baselines) and from the stellar photosphere (long baselines). Results: After revising Vega's K-band angular diameter (theta_UD = 3.202 ± 0.005 mas), we show that a significant deficit in squared visibility (Delta V[SUP]2[/SUP] = 1.88 ± 0.34%) is detected at short baselines with respect to the best-fit uniform disk stellar model. This deficit can be either attributed to the presence of a low-mass stellar companion around Vega, or as the signature of the thermal and scattered emissions from the debris disk. We show that the presence of a close companion is highly unlikely, as well as other possible perturbations (stellar morphology, calibration), and deduce that we have most probably detected the presence of dust in the close neighbourhood of Vega. The resulting flux ratio between the stellar photosphere and the debris disk amounts to 1.29 ± 0.19% within the FLUOR field-of-view (~7.8 AU). Finally, we complement our K-band study with archival photometric and interferometric data in order to evaluate the main physical properties of the inner dust disk. The inferred properties suggest that the Vega system could be currently undergoing major dynamical perturbations.
Researchers
http://hdl.handle.net/2268/16576
10.1051/0004-6361:20054522
http://adsabs.harvard.edu/abs/2006A%26A...452..237A
http://de.arxiv.org/abs/astro-ph/0604260

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