ORBi: Absil Olivier - The Fomalhaut debris disk seen from every angle with interferometry

Reference : The Fomalhaut debris disk seen from every angle with interferometry


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/81465

Title :	The Fomalhaut debris disk seen from every angle with interferometry
Language :	English
Author, co-author :	Absil, Olivier [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
	Mennesson, B. [Jet Propulsion Lab. (USA)]
	Le Bouquin, J.-B. [LAOG, CNRS, Univ. Joseph Fourier (France)]
	Augereau, J.-C. [LAOG, CNRS, Univ. Joseph Fourier (France)]
	Millan-Gabet, R. [Jet Propulsion Lab, (USA)]
	Colavita, M. [Jet Propulsion Lab, (USA)]
	Hinz, P. [Steward Observatory, The Univ. of Arizona (USA)]
	Liu, W. [Steward Observatory, The Univ. of Arizona (USA)]
	Serabyn, G. [Jet Propulsion Lab. (USA)]
Publication date :	Jul-2010
Main document title :	Optical and Infrared Interferometry II
Editor :	Danchi, W. C.
	Delplancke, F.
	Rajagopal, J. K.
Publisher :	SPIE
Collection and collection volume :	Proceedings of the SPIE, volume 7734
Pages :	17.1-17.11
On invitation :	No
Audience :	International
City :	Bellingham
Country :	WA, USA
Event name :	Astronomical Telescopes and Instrumentation 2010: Optical and Infrared Interferometry II
Event date :	27/06/2010 - 2/07/2010
Event organizer :	SPIE
Event place (city) :	San Diego
Event country :	CA, USA
Abstract :	[en] 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.
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/81465
DOI :	10.1117/12.858260
Other URL :	http://adsabs.harvard.edu/abs/2010SPIE.7734E..34A

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