Reference : A near-infrared interferometric survey of debris disk stars. I. Probing the hot dust con...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/22982
A near-infrared interferometric survey of debris disk stars. I. Probing the hot dust content around eps Eridani and tau Ceti with CHARA/FLUOR
English
Di Folco, Emmanuel [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland > > > >]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Augereau, J.-C. [Laboratoire d'Astrophysique de l'Observatoire de Grenoble, UMR CNRS/UJF 5571, BP 53, 38041 Grenoble Cedex 9, France]
Mérand, A. [Center for High Angular Resolution Astronomy, Georgia State University, PO Box 3969, Atlanta, Georgia 30302-3965, USA]
Coudé Du Foresto, V. [LESIA, UMR8109, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon, France]
Thévenin, F. [Laboratoire Cassiopée, CNRS, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France]
Defrere, Denis mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Kervella, P. [LESIA, UMR8109, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon, France]
Ten Brummelaar, T. A. [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]
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]
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]
Nov-2007
Astronomy and Astrophysics
EDP Sciences
475
243-250
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] stars: individual: tau Cet & eps Eri ; stars: fundamental parameters ; circumstellar matter ; methods: observational ; techniques: interferometric
[en] Context: The quest for hot dust in the central region of debris disks requires high resolution and high dynamic range imaging. Near-infrared interferometry is a powerful means to directly detect faint emission from hot grains. Aims: We probed the first 3 AU around tau Ceti and eps Eridani with the CHARA array (Mt Wilson, USA) in order to gauge the 2 mum excess flux emanating from possible hot dust grains in the debris disks and to also resolve the stellar photospheres. Methods: High precision visibility amplitude measurements were performed with the FLUOR single mode fiber instrument and telescope pairs on baselines ranging from 22 to 241 m of projected length. The short baseline observations allow us to disentangle the contribution of an extended structure from the photospheric emission, while the long baselines constrain the stellar diameter. Results: We have detected a resolved emission around tau Cet, corresponding to a spatially integrated, fractional excess flux of 0.98±0.21 × 10[SUP]-2[/SUP] with respect to the photospheric flux in the K'-band. Around eps Eri, our measurements can exclude a fractional excess of greater than 0.6× 10[SUP]-2[/SUP] (3sigma). We interpret the photometric excess around tau Cet as a possible signature of hot grains in the inner debris disk and demonstrate that a faint, physical or background, companion can be safely excluded. In addition, we measured both stellar angular diameters with an unprecedented accuracy: Theta_LD(tau Cet)= 2.015 ± 0.011 mas and Theta_LD(eps Eri)=2.126 ± 0.014 mas.
Researchers
http://hdl.handle.net/2268/22982
10.1051/0004-6361:20077625
http://adsabs.harvard.edu/abs/2007A%26A...475..243D
http://www.aanda.org/index.php?option=article&access=bibcode&bibcode=2007A%2526A...475..243DFUL - Copyright ESO 2007, published by EDP Sciences
http://de.arxiv.org/abs/0710.1731

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