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

M. N'Diaye; S. Cuevas; B. Sánchez; A. Carlotti; A. Vigan; K. Dohlen; M. Bonnefoy; J.-L. Beuzit

doi:10.1117/12.2313155

11 July 2018 High-contrast observations of circumstellar environments with GTC/FRIDA: design and study of the coronagraphic devices

M. N'Diaye, S. Cuevas, B. Sánchez, A. Carlotti, A. Vigan, K. Dohlen, M. Bonnefoy, J.-L. Beuzit

Author Affiliations +

Proceedings Volume 10703, Adaptive Optics Systems VI; 107033E (2018) https://doi.org/10.1117/12.2313155
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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M. N'Diaye, S. Cuevas, B. Sánchez, A. Carlotti, A. Vigan, K. Dohlen, M. Bonnefoy, and J.-L. Beuzit "High-contrast observations of circumstellar environments with GTC/FRIDA: design and study of the coronagraphic devices", Proc. SPIE 10703, Adaptive Optics Systems VI, 107033E (11 July 2018); https://doi.org/10.1117/12.2313155

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