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Proceedings Paper

High contrast polarimetry in the infrared with SPHERE on the VLT
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Paper Abstract

The instrument SPHERE (Spectro-Polarimetric High-contrast Exoplanet REsearch), recently installed on the VLT-UT3, aims to detected and characterize giant extra-solar planets and the circumstellar environments in the very close vicinity of bright stars. The extreme brightness contrast and small angular separation between the planets or disks and their parent stars have so far proven very challenging. SPHERE will meet this challenge by using an extreme AO, stellar coronagraphs, an infrared dual band and polarimetric imager called IRDIS, an integral field spectrograph, and a visible polarimetric differential imager called ZIMPOL. Polarimetry allows a separation of the light coming from an unpolarized source such as a star and the polarized source such as a planet or protoplanetary disks. In this paper we present the performance of the infrared polarimetric imager based on experimental validations performed within SPHERE before the preliminary acceptance in Europe. We report on the level of instrumental polarization in the infrared and its calibration limit. Using differential polarimetry technique, we quantify the level of speckle suppression, and hence improved sensitivity in the context of imaging extended stellar environments.

Paper Details

Date Published: 8 July 2014
PDF: 7 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91471R (8 July 2014); doi: 10.1117/12.2055549
Show Author Affiliations
M. Langlois, Ctr. de Recherche Astronomique de Lyon, Observatoire de Lyon, CNRS, Univ. de Lyon 1 (France)
Ecole Normale Supérieure de Lyon (France)
K. Dohlen, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
A. Vigan, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
A. Zurlo, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
C. Moutou, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
H. M. Schmid, ETH Zürich (Switzerland)
J. Mili, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Jean-Luc Beuzit, Institut de Planétologie et d’Astrophysique de Grenoble (France)
A. Boccaletti, LESIA, Observatoire de Paris (France)
Michael Carle, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
Anne Costille, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
R. Dorn, European Southern Observatory (Germany)
L. Gluck, Institut de Planétologie et d’Astrophysique de Grenoble (France)
N. Hubin, European Southern Observatory (Germany)
M. Feldt, Max-Planck-Institut für Astronomie (Germany)
M. Kasper, European Southern Observatory (Germany)
L. Lizon, European Southern Observatory (Germany)
F. Madec, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
David Le Mignant, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
David Mouillet, Institut de Planétologie et d’Astrophysique de Grenoble (France)
J.-P. Puget, Institut de Planétologie et d’Astrophysique de Grenoble (France)
Jean-François Sauvage, ONERA (France)
F. Wildi, Observatoire Astronomique de l’Univ. de Genève (Switzerland)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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