Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..175b&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
The contrast between an extrasolar planet and its star is too severe to allow a direct detection without using imagery techniques at high dynamical range. One of these techniques is the use of a coronograph of the type "nulling" on a telescope presenting a not too disturbed wave front. The LESIA developed one of these coronographs, the 4-quadrant coronograph. I will present the IR cryogenic bench recently developed with the LESIA to validate the use of this coronograph in IR. On the one hand, I will have the results obtained around 4.8 microns which allow to compare various fabrication techniques and various materials for the coronographs considered for the instrument MIRI (on board JWST). In addition I will present the tests which were made in near-IR (2.2 microns) in preparation to VLT-PF. I will discuss the validity of these results compared to the specifications of VLT-PF on the sky.
Baudoz Pi.
Baudrand Jacques
Boccaletti Anthony
Parisot Jerome
Reess Jean-Michel
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