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On-sky results with the fast guiding system on the SPIRou spectroplarimeter at CFHT
Author(s): Greg Barrick; Jean-Francois Donati; Sébastien Baratchart; Claire Moutou; Tom Vermeulen; Kevin Ho; Marie Larrieu; Laurent Parès; Michel Dupieux; Shiang-Yu Wang; Chi-Hung Yan
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Paper Abstract

SPIRou (SpectroPolarimètre Infra-Rouge in French), is a near-infrared, fiber-fed spectropolarimeter at the CanadaFrance-Hawaii Telescope (CFHT) which gives full spectral coverage from 0.98 to 2.35 μm with a resolving power of 70,000. The main science drivers for SPIRou are (i) detecting and characterizing exoplanets around nearby M dwarfs through high-precision (1 m/s) velocimetry, and (ii) investigating the impact of magnetic fields on star/planet formation through spectropolarimetry. One of the requirements for achieving this challenging radial velocity (RV) precision is ensuring that the observed star does not move with respect to the instrument entrance aperture by more than 0.05 arcseconds RMS over the course of the observation. This is complicated by the fact that the guiding uses light from the science target so that only about 13% of the light (10% from the wings and 3% from the core) is available in seeing conditions of 0.65 arc-seconds in H band. To achieve this level of guiding accuracy, a fast guiding system has been implemented in the injection module of the instrument. This paper describes the system, its performance in tests on the sky with the CFHT since the delivery of SPIRou in January 2018, and gives comparisons to laboratory measurements and simulations.

Paper Details

Date Published: 6 July 2018
PDF: 12 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070268 (6 July 2018); doi: 10.1117/12.2312317
Show Author Affiliations
Greg Barrick, Canada-France-Hawaii Telescope (United States)
Jean-Francois Donati, Institut de Recherche en Astrophysique et Planétologie (France)
Sébastien Baratchart, Institut de Recherche en Astrophysique et Planétologie (France)
Claire Moutou, Canada-France-Hawaii Telescope (United States)
Tom Vermeulen, Canada-France-Hawaii Telescope (United States)
Kevin Ho, Canada-France-Hawaii Telescope (United States)
Marie Larrieu, Institut de Recherche en Astrophysique et Planétologie (France)
Laurent Parès, Institut de Recherche en Astrophysique et Planétologie (France)
Michel Dupieux, Institut de Recherche en Astrophysique et Planétologie (France)
Shiang-Yu Wang, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)
Chi-Hung Yan, Institute of Astronomy and Astrophysics - Academia Sinica (Taiwan)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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