Performance of the Cophasing System of Persee, a Dynamic Nulling Demonstrator

Details Performance of the Cophasing System of Persee, a Dynamic Nulling Demonstrator Performance of the Cophasing System of Persee, a Dynamic Nulling Demonstrator

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..430..460h&link_type=abstract

Pathways Towards Habitable Planets, proceedings of a workshop held 14 to 18 September 2009 in Barcelona, Spain. Edited by Vincen

Astronomy and Astrophysics

Astronomy

Scientific paper

Spectral characterization of exoplanets can be made by nulling interferometers. In this context, several projects have been proposed such as DARWIN/TPF-I, FKSI, PEGASE, and ALADDIN. To stabilize the beams with the required nanometric accuracy, a cophasing system is required, made of a piston/tip/tilt actuator on each arm and a piston/tip-tilt sensor. The demonstration of the feasibility of such a cophasing system is a central issue. In this goal, a laboratory breadboard named PERSEE is under integration at Observatoire de Paris-Meudon. This paper describes the current status of PERSEE. We show that a cophasing at a subnanometric level has been reached, which allowed us to reach a monochromatic null depth of N=6.2×10-5 ± 6.3×10-6.

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