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Proceedings Paper

CHEOPS/ZIMPOL: a VLT instrument study for the polarimetric search of scattered light from extrasolar planets
Author(s): Daniel Gisler; Hans Martin Schmid; Christian Thalmann; Hans Peter Povel; Jan O. Stenflo; Franco Joos; Markus Feldt; Rainer Lenzen; Jaap Tinbergen; Raffaele Gratton; Remko Stuik; Daphne M. Stam; Wolfgang Brandner; Stefan Hippler; Massimo Turatto; R. Neuhauser; Carsten Dominik; Artie Hatzes; Thomas Henning; Jorge Lima; Andreas Quirrenbach; L.B.F.M. Waters; Gunther Wuchterl; Hans Zinnecker
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Paper Abstract

We present results from a phase A study supported by ESO for a VLT instrument for the search and investigation of extrasolar planets. The envisaged CHEOPS (CHaracterizing Extrasolar planets by Opto-infrared Polarization and Spectroscopy) instrument consists of an extreme AO system, a spectroscopic integral field unit and an imaging polarimeter. This paper describes the conceptual design of the imaging polarimeter which is based on the ZIMPOL (Zurich IMaging POLarimeter) technique using a fast polarization modulator combined with a demodulating CCD camera. ZIMPOL is capable of detecting polarization signals on the order of p=0.001% as demonstrated in solar applications. We discuss the planned implementation of ZIMPOL within the CHEOPS instrument, in particular the design of the polarization modulator. Further we describe strategies to minimize the instrumental effects and to enhance the overall measuring efficiency in order to achieve the very demanding science goals.

Paper Details

Date Published: 30 September 2004
PDF: 12 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.550366
Show Author Affiliations
Daniel Gisler, Swiss Federal Institute of Technology (Switzerland)
Hans Martin Schmid, Swiss Federal Institute of Technology (Switzerland)
Christian Thalmann, Swiss Federal Institute of Technology (Switzerland)
Hans Peter Povel, Swiss Federal Institute of Technology (Switzerland)
Jan O. Stenflo, Swiss Federal Institute of Technology (Switzerland)
Franco Joos, Swiss Federal Institute of Technology (Switzerland)
Markus Feldt, Max-Planck-Institut fur Astronomie (Germany)
Rainer Lenzen, Max-Planck-Institut fur Astronomie (Germany)
Jaap Tinbergen, ASTRON (Netherlands)
Raffaele Gratton, INAF, Osservatorio Astronomico di Padova (Italy)
Remko Stuik, Univ. Leiden (Netherlands)
Daphne M. Stam, Univ. van Amsterdam (Netherlands)
Wolfgang Brandner, Max-Planck-Institut fur Astronomie (Germany)
Stefan Hippler, Max-Planck-Institut fur Astronomie (Germany)
Massimo Turatto, INAF, Osservatorio Astronomico di Padova (Italy)
R. Neuhauser, Friedrich-Schiller-Univ. Jena (Germany)
Carsten Dominik, Univ. van Amsterdam (Netherlands)
Artie Hatzes, Thuringian State Observatory (Germany)
Thomas Henning, Max-Planck-Institut fur Astronomie (Germany)
Jorge Lima, Univ. de Lisboa (Portugal)
Andreas Quirrenbach, Univ. Leiden (Netherlands)
L.B.F.M. Waters, Univ. van Amsterdam (Netherlands)
Gunther Wuchterl, Friedrich-Schiller-Univ. Jena (Germany)
Hans Zinnecker, Astrophysikalisches Institut Potsdam (Germany)


Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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