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Proceedings Paper

VIDA (VLTI imaging with a densified array): a densified pupil combiner proposed for snapshot imaging with the VLTI
Author(s): Olivier Lardiere; Antoine Labeyrie; Denis Mourard; Pierre Riaud; Luc Arnold; Julien Dejonghe; Sophie Gillet
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Paper Abstract

Only in the recent years did it become realized that multi-aperture interferometric arrays could provide direct snapshot images and coronagraphic images in a non-Fizeau mode. Whereas homothetic mapping of entrance pupil to exit pupil is useless when the aperture is higly diluted, a "densified-pupil" or "hypertelescope" imaging mode can concentrate most light into a high-resolution Airy peak. In addition to the luminosity gain, there is a contrast gain particularly valuable for stellar coronagraphy and exoplanets finding. The current VLTI is able to combine light from two telescopes coherently. In subsequent phases, a combiner is planned for applying closure phase with up to eight telescopes (UT and AT). The small number of apertures currently considered at the VLTI, does not take full advantage of hypertelescope imaging, but still performs significantly better than other observing modes (+3.8mag gain in comparison with Fizeau mode). We propose some possible optical scheme for a densified-pupil combiner for the VLTI. Beyond its science value, the proposed instrument can serve as a precursor for many-element post-VLTI hypertelescopes.

Paper Details

Date Published: 21 February 2003
PDF: 10 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.459076
Show Author Affiliations
Olivier Lardiere, LISE, College de France (France)
Antoine Labeyrie, LISE, College de France (France)
Denis Mourard, Observatoire de la Cote d'Azur (France)
Pierre Riaud, Observatoire de Paris-Meudon (France)
LISE, College de France (France)
Luc Arnold, Observatoire de Haute-Provence (France)
Julien Dejonghe, Observatoire de Haute-Provence (France)
Sophie Gillet, Observatoire de Haute-Provence (France)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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