First images on the sky from a hyper telescope

Citation
E. Pedretti et al., First images on the sky from a hyper telescope, ASTR AST SS, 147(2), 2000, pp. 285-290
Citations number
10
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
ISSN journal
03650138 → ACNP
Volume
147
Issue
2
Year of publication
2000
Pages
285 - 290
Database
ISI
SICI code
0365-0138(200012)147:2<285:FIOTSF>2.0.ZU;2-R
Abstract
We show star images obtained with a miniature "densified pupil imaging inte rferometer" also called a hyper-telescope. The formation of such images vio lates a "golden rule of imaging interferometers" which appeared to forbid t he use of interferometric arrangements differing from a Fizeau interferomet er. These produce useless images when the sub-apertures spacing is much wid er than their size, owing to diffraction through the sub-apertures. The hyp er-telescope arrangement solves these problems opening the way towards mult i-kilometer imaging arrays in space. We experimentally obtain an intensity gain of 24 +/- 3x when a densified-pupil interferometer is compared to an e quivalent Fizeau-type interferometer and show images of the double star alp ha Gem. The initial results presented confirm the possibility of directly o btaining high resolution and high dynamic range images in the recombined fo cal plane of a large interferometer if enough elements are used.