Imaging, Spectroscopic, High-Contrast, and Interferometric Instrumentation

SAXO: the extreme adaptive optics system of SPHERE (I) system overview and global laboratory performance

[+] Author Affiliations
Jean-Francois Sauvage, Thierry Fusco

ONERA—Optics Department, 29 Avenue de la Division Leclerc, F-92322 Chatillon Cedex, France

Aix Marseille Université, CNRS, Laboratoire d’Astrophysique de Marseille, UMR 7326, 13388 Marseille, France

Cyril Petit

ONERA—Optics Department, 29 Avenue de la Division Leclerc, F-92322 Chatillon Cedex, France

Anne Costille, Kjetil Dohlen, Emmanuel Hugot

Aix Marseille Université, CNRS, Laboratoire d’Astrophysique de Marseille, UMR 7326, 13388 Marseille, France

David Mouillet, Jean-Luc Beuzit, Sylvain Rochat, Philippe Feautrier, Pascal Puget

UJF-Grenoble 1/CNRS-INSU, Institut de Planetologie et d’Astrophysique de Grenoble, UMR 5274, Grenoble F-38041, France

Markus Kasper, Marcos Suarez, Christian Soenke, Mark Downing, Jared O’Neal, Julien Girard, Dimitri Mawet

European Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching D-85748, Germany

Andrea Baruffolo, Bernardo Salasnich

Istituto Nazionale di Astrofisica, Osservatorio di Padova, Vicolo Osservatorio 5, Padova 35122, Italia

Enrico Fedrigo

European Patent Office, Bob-van-Benthem-Platz 1, Munich 80469, Germany

Pierre Baudoz, Arnaud Sevin, Denis Perret

Laboratoire d’Etudes Spatiales et d’Instrumentation Astrophysiques—Observatoire de Paris, Section de Meudon 5, place Jules Janssen 92195 Meudon, France

Francois Wildi

Observatoire de Geneve, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland

Arthur Vigan

Aix Marseille Université, CNRS, Laboratoire d’Astrophysique de Marseille, UMR 7326, 13388 Marseille, France

European Southern Observatory, Karl-Schwarzschild-Strasse 2, Garching D-85748, Germany

Hans Martin Schmid

ETH Zurich, Institute for Astronomy, Wolfgang-Pauli-Strasse 27, CH-8092 Zurich, Switzerland

Ronald Roelfsema

NOVA Optical Infrared Instrumentation Group, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands

J. Astron. Telesc. Instrum. Syst. 2(2), 025003 (May 24, 2016). doi:10.1117/1.JATIS.2.2.025003
History: Received July 23, 2015; Accepted March 31, 2016
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Abstract.  The direct imaging of exoplanet is a leading field of today’s astronomy. The photons coming from the planet carry precious information on the chemical composition of its atmosphere. The second-generation instrument, Spectro-Polarimetric High contrast Exoplanet Research (SPHERE), dedicated to detection, photometry and spectral characterization of Jovian-like planets, is now in operation on the European very large telescope. This instrument relies on an extreme adaptive optics (XAO) system to compensate for atmospheric turbulence as well as for internal errors with an unprecedented accuracy. We demonstrate the high level of performance reached by the SPHERE XAO system (SAXO) during the assembly integration and test (AIT) period. In order to fully characterize the instrument quality, two AIT periods have been mandatory. In the first phase at Observatoire de Paris, the performance of SAXO itself was assessed. In the second phase at IPAG Grenoble Observatory, the operation of SAXO in interaction with the overall instrument has been optimized. In addition to the first two phases, a final check has been performed after the reintegration of the instrument at Paranal Observatory, in the New Integration Hall before integration at the telescope focus. The final performance aimed by the SPHERE instrument with the help of SAXO is among the highest Strehl ratio pretended for an operational instrument (90% in H band, 43% in V band in a realistic turbulence r0, and wind speed condition), a limit R magnitude for loop closure at 15, and a robustness to high wind speeds. The full-width at half-maximum reached by the instrument is 40 mas for infrared in H band and unprecedented 18.5 mas in V band.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Jean-Francois Sauvage ; Thierry Fusco ; Cyril Petit ; Anne Costille ; David Mouillet, et al.
"SAXO: the extreme adaptive optics system of SPHERE (I) system overview and global laboratory performance", J. Astron. Telesc. Instrum. Syst. 2(2), 025003 (May 24, 2016). ; http://dx.doi.org/10.1117/1.JATIS.2.2.025003


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