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Proceedings Paper

The differential tip-tilt sensor of SPHERE
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Paper Abstract

The SPHERE instrument aims at detecting giant extrasolar planets in the vicinity of bright stars. Such a challenging goal requires the use of a high performance Adaptive Optics (AO) system, a coronagraphic device to cancel out the flux coming from the star itself, and smart focal plane techniques to calibrate residual uncorrected turbulent and/or static wavefronts. Inside the adaptive optic system, a specific tool is developed in SPHERE to ensure that the star is always well centered on the coronagraph. This tool called Differential Tip-Tilt Sensor (DTTS) measures the position of the star at the same wavelength than the science instruments. It is located very close to the focal plane to minimize drifts between DTTS and the coronagraph. After describing the DTTS, we will describe the tests and laboratory results on stability measurement of the DTTS; stability which is crucial for SPHERE performance.

Paper Details

Date Published: 20 July 2010
PDF: 7 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77355B (20 July 2010); doi: 10.1117/12.858274
Show Author Affiliations
Pierre Baudoz, LESIA, CNRS, Observatoire de Paris-Meudon (France)
Reinhold J. Dorn, European Southern Observatory (Germany)
Jean-Louis Lizon, European Southern Observatory (Germany)
Thierry Fusco, ONERA (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
Julien Charton, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Jean-Luc Beuzit, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Pascal Puget, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
David Mouillet, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Markus Felt, Max-Planck-Institut für Astronomie (Germany)
Francois Wildi, Observatoire de Genève (United States)
Andrea Barrufolo, INAF, Osservatorio Astronomico di Padova (Italy)
Markus Kasper, European Southern Observatory (Germany)
Norbert Hubin, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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