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The Fomalhaut debris disk seen from every angle with interferometry

Absil, O. and Mennesson, B. and Le Bouquin, J.-B. and Augereau, J.-C. and Millan-Gabet, R. and Colavita, M. and Hinz, P. and Liu, W. and Serabyn, G. (2010) The Fomalhaut debris disk seen from every angle with interferometry. In: Optical and Infrared Interferometry II. Proceedings of SPIE. No.7734. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. no. 773417. ISBN 9780819482242.

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In this paper, we present the results of three different studies of the Fomalhaut debris disk with infrared interferometry. First, VLTI/AMBER measurements are used to determine the position angle of the slightly oblate rapidly rotating photosphere by means of differential phase measurements across the Br-gamma photospheric line. This measurement allows us to confirm that the debris disk is located in the equatorial plane of its host star. Second, we use VLTI/VINCI to search for resolved near-infrared emission around the stellar photosphere, which would correspond to the presence of large amounts of hot dust grains located between the sublimation radius and the habitable zone. Our observations reveal a small excess of 0.88%±0.12% in K band relative to the photospheric flux. Finally, we use the Keck Interferometer Nuller in order to derive additional constraints on the nature of the resolved infrared emission. Our observations suggest a marginal detection of a circumstellar excess at 10 μm, which we use together with the VINCI detection to model the circumstellar emission. Preliminary results from this modeling effort are discussed.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Absil, O.0000-0002-4006-6237
Mennesson, B.0000-0003-4205-4800
Millan-Gabet, R.0000-0003-0447-5866
Hinz, P.0000-0002-1954-4564
Additional Information:© 2010 Society of Photo-Optical Instrumentation Engineers (SPIE). O. A. acknowledges the financial support of F.R.S.-FNRS (Postdoctoral Researcher), and support from “Communauté Française de Belgique – Actions de Recherche Concertées – Académie universitaire Wallonie-Europe”. This research was partly funded by the International Space Science Institute (“Exozodiacal Dust Disks and Darwin” working group). Part of this work is based on observations collected at the VLTI (ESO Paranal, Chile), under program ID 082.C-0376 (AMBER Guaranteed Time of the Osservatorio Astrofisico di Arcetri, INAF, Italy) and using public VINCI commissioning data. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Communauté Française de Belgique – Actions de Recherche Concertées – Académie universitaire Wallonie-EuropeUNSPECIFIED
International Space Science Institute (ISSI)UNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)082.C-0376
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:Circumstellar dust, planetary systems, interferometry
Series Name:Proceedings of SPIE
Issue or Number:7734
Record Number:CaltechAUTHORS:20180713-105446710
Persistent URL:
Official Citation:O. Absil, B. Mennesson, J.-B. Le Bouquin, J.-C. Augereau, R. Millan-Gabet, M. Colavita, P. Hinz, W. Liu, G. Serabyn, "The Fomalhaut debris disk seen from every angle with interferometry", Proc. SPIE 7734, Optical and Infrared Interferometry II, 773417 (21 July 2010); doi: 10.1117/12.858260;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87822
Deposited By: George Porter
Deposited On:16 Jul 2018 20:10
Last Modified:07 Apr 2020 19:16

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