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High-contrast observations of circumstellar environments with GTC/FRIDA: design and study of the coronagraphic devices
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Paper Abstract

Over the past few years, several large ground-based facilities have enhanced their exoplanet direct imaging capabilities to observe planetary companions and debris disks around nearby stars. The Gran Telescopio Canarias (GTC) will soon have its first high-contrast capabilities with FRIDA. This near-infrared imager and integral field spectrograph will operate with GTCAO, the adaptive optics system of the telescope, to cover a broad range of astrophysical topics. In 2008, we performed preliminary studies to design a high-contrast mode for FRIDA. In this communication, we revisit these studies by investigating different options in coronagraphy to define a final high-contrast baseline for this instrument. Acknowledging the mechanical constraints of FRIDA and the GTCAO performance for high-contrast observations (60% Strehl ratio in K-band), we evaluate different options such as standalone pupil apodizations and classical Lyot coronagraphs to achieve a 10−5 contrast at 200-300 mas from an observed star over wide spectral bands. We then derive the adopted solutions for design and manufacturing of the prototypes. Finally, we discuss possible combinations of high-dispersion spectroscopy and high-contrast imaging for advanced exoplanet observations with this instrument.

Paper Details

Date Published: 11 July 2018
PDF: 13 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107033E (11 July 2018); doi: 10.1117/12.2313155
Show Author Affiliations
M. N'Diaye, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Lab. Lagrange (France)
S. Cuevas, Univ. Nacional Autónoma de México (Mexico)
B. Sánchez, Univ. Nacional Autónoma de México (Mexico)
A. Carlotti, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes (France)
A. Vigan, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
K. Dohlen, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
M. Bonnefoy, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes (France)
J.-L. Beuzit, Aix Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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