Optical design for the Global Astrometric Interferometer for Astrophysics

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Space-based interferometers dedicated to wide-angle astrometry would dramatically increase the accuracy of angular measurements fundamental to a wide range of astrophysical problems. The proposed Global Astrometric Interferometer for Astrophysics, a continuously rotating instrument comprising two or three interferometers, will reach the 5-20 (mu) as level on more than 35 million objects. The necessary wide field-of-view for such a precision could be obtained with a Fizeau interferometer. We propose a design for a 2.6 m baseline interferometer with two 0.5 m apertures, and overal dimensions compatible wiht the size of the Ariane V payload shroud. It has approximately 1 degree diffraction limited field-of-view. The response of the optical system to small perturbations on each optical element is given in terms of fringe visibility, which is shown to depend only on subaperuture spot separation.

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