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Proceedings Paper

Phase closure image reconstruction for future VLTI instrumentation
Author(s): Mercedes E. Filho; Stephanie Renard; Paulo Garcia; Gilles Duvert; Eric Thiebaut; John Young; Olivier Absil; Jean-Phillipe Berger; Thomas Beckert; Sebastian Hoenig; Dieter Schertl; Gerd Weigelt; Leonardo Testi; Eric Tatuli; Virginie Borkowski; Michaël de Becker; Jean Surdej; Bernard Aringer; Joseph Hron; Thomas Lebzelter; Andrea Chiavassa; Romano Corradi; Tim Harries
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Paper Abstract

Classically, optical and near-infrared interferometry have relied on closure phase techniques to produce images. Such techniques allow us to achieve modest dynamic ranges. In order to test the feasibility of next generation optical interferometers in the context of the VLTI-spectro-imager (VSI), we have embarked on a study of image reconstruction and analysis. Our main aim was to test the influence of the number of telescopes, observing nights and distribution of the visibility points on the quality of the reconstructed images. Our results show that observations using six Auxiliary Telescopes (ATs) during one complete night yield the best results in general and is critical in most science cases; the number of telescopes is the determining factor in the image reconstruction outcome. In terms of imaging capabilities, an optical, six telescope VLTI-type configuration and ~200 meter baseline will achieve 4 mas spatial resolution, which is comparable to ALMA and almost 50 times better than JWST will achieve at 2.2 microns. Our results show that such an instrument will be capable of imaging, with unprecedented detail, a plethora of sources, ranging from complex stellar surfaces to microlensing events.

Paper Details

Date Published: 28 July 2008
PDF: 10 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 70133Z (28 July 2008); doi: 10.1117/12.787877
Show Author Affiliations
Mercedes E. Filho, Ctr. de Astrofisica, Univ. do Porto (Portugal)
Stephanie Renard, Observatoire de Lyon (France)
Paulo Garcia, Ctr. de Astrofisica, Univ. do Porto (Portugal)
Univ. do Porto (Portugal)
Gilles Duvert, Lab. d'Astrophysique de Grenoble, Observatoire de Grenoble (France)
Eric Thiebaut, Observatoire de Lyon (France)
John Young, Cavendish Lab. (United Kingdom)
Olivier Absil, Univ. Joseph Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Jean-Phillipe Berger, Univ. Joseph Fourier, CNRS, Lab. d'Astrophysique de Grenoble (France)
Thomas Beckert, Max-Planck Institute for Radioastronomy (Germany)
Sebastian Hoenig, Max-Planck Institute for Radioastronomy (Germany)
Dieter Schertl, Max-Planck Institute for Radioastronomy (Germany)
Gerd Weigelt, Max-Planck Institute for Radioastronomy (Germany)
Leonardo Testi, INAF, Osservatorio di Astrofisica di Arcetri (Italy)
Eric Tatuli, INAF, Osservatorio di Astrofisica di Arcetri (Italy)
Virginie Borkowski, Institute of Astrophysics and Geophysics (Belgium)
Michaël de Becker, Institute of Astrophysics and Geophysics (Belgium)
Jean Surdej, Institute of Astrophysics and Geophysics (Belgium)
Bernard Aringer, Institute of Astrophysics, Univ. of Wien (Austria)
Joseph Hron, Institute of Astrophysics, Univ. of Wien (Austria)
Thomas Lebzelter, Institute of Astrophysics, Univ. of Wien (Austria)
Andrea Chiavassa, Groupe de Recherche en Astronomie et Astrophysique du Languedoc (France)
Romano Corradi, Groupe de Recherche en Astronomie et Astrophysique du Languedoc (France)
Tim Harries, Univ. of Exeter (United Kingdom)


Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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