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27 July 2010SAXO, the eXtreme Adaptive Optics System of SPHERE: overview and calibration procedure
J.-F. Sauvage,1 T. Fusco,1 C. Petit,1 S. Meimon,1 E. Fedrigo,2 M. Suarez Valles,2 M. Kasper,2 N. Hubin,2 J.-L. Beuzit,3 J. Charton,3 A. Costille,3 P,. Rabou,3 D. Mouillet,3 P. Baudoz,4 T. Buey,4 A. Sevin,4 F. Wildi,5 K. Dohlen6
1ONERA (France) 2European Organisation for Astronomical Research in the Southern Hemisphere (Germany) 3Lab. d'Astrophysique de l'Observatoire de Grenoble (France) 4LESIA, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France) 5HES-SO (Switzerland) 6LAM, Observatoire Astronomique de Marseille-Provence, CNRS, Univ. of Provence Aix-Marseilles (France)
The direct imaging of exoplanet is a challenging goal of todays astronomy. The light transmitted by exoplanet
atmosphere is of a great interest as it may witness for life sign. SPHERE is a second generation instrument for
the VLT, dedicated to exoplanet imaging, detection, and characterisation. SPHERE is a global project of an
European consortium of 11 institutes from 5 countries. We present here the state of the art of the AIT of the
Adaptive Optics part of the instrument. In addition we present fine calibration procedures dedicated to eXtreme
Adaptive Optics systems. First we emphasized on vibration and turbulence identification for optimization of the
control law. Then, we describe a procedure able to measure and compensate for NCPA with a coronagraphic
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J.-F. Sauvage, T. Fusco, C. Petit, S. Meimon, E. Fedrigo, M. Suarez Valles, M. Kasper, N. Hubin, J.-L. Beuzit, J. Charton, A. Costille, P,. Rabou, D. Mouillet, P. Baudoz, T. Buey, A. Sevin, F. Wildi, K. Dohlen, "SAXO, the eXtreme Adaptive Optics System of SPHERE: overview and calibration procedure," Proc. SPIE 7736, Adaptive Optics Systems II, 77360F (27 July 2010);