Experimental test of a 40 cm-long R=100 000 spectrometer for exoplanet characterisation

Guillaume Bourdarot; Etienne Le Coarer; David Mouillet; Jean-Jacques Correia; Laurent Jocou; Patrick Rabou; Alexis Carlotti; Xavier Bonfils; Etienne Artigau; Philippe Vallee; Rene Doyon; Thierry Forveille; Eric Stadler; Yves Magnard; Arthur Vigan

doi:10.1117/12.2311696

6 July 2018 Experimental test of a 40 cm-long R=100 000 spectrometer for exoplanet characterisation

Guillaume Bourdarot, Etienne Le Coarer, David Mouillet, Jean-Jacques Correia, Laurent Jocou, Patrick Rabou, Alexis Carlotti, Xavier Bonfils, Etienne Artigau, Philippe Vallee, Rene Doyon, Thierry Forveille, Eric Stadler, Yves Magnard, Arthur Vigan

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107025Y (2018) https://doi.org/10.1117/12.2311696
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

High-resolution spectroscopy is a key element for present and future astronomical instrumentation. In particular, coupled to high contrast imagers and coronagraphs, high spectral resolution enables higher contrast and has been identified as a very powerful combination to characterise exoplanets, starting from giant planets now, up to Earth-like planet eventually for the future instruments. In this context, we propose the implementation of an innovative echelle spectrometer based on the use of VIPA (Virtually Imaged Phased Array, Shirasaki 1996). The VIPA itself is a particular kind of Fabry-P´erot interferometer, used as an angular disperser with much greater dispersive power than common diffraction grating. The VIPA is an efficient, small component (3 cm × 2.4 cm), that takes the very advantage of single mode injection in a versatile design. The overall instrument presented here is a proof-of-concept of a compact, high-resolution (R > 80 000) spectrometer, dedicated to the H and K bands, in the context of the project “High-Dispersion Coronograhy“ developed at IPAG. The optical bench has a foot-print of 40 cm × 26 cm ; it is fed by two Single-Mode Fibers (SMF), one dedicated to the companion, and one to the star and/or to a calibration channel, and is cooled down to 80 K. This communication first presents the scientific and instrumental context of the project, and the principal merit of single-mode operations in high-resolution spectrometry. After recalling the physical structure of the VIPA and its implementation in an echelle-spectrometer design, it then details the optical design of the spectrometer. In conclusion, further steps (integration, calibration, coupling with adaptive optics) and possible optimization are briefly presented.

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Guillaume Bourdarot, Etienne Le Coarer, David Mouillet, Jean-Jacques Correia, Laurent Jocou, Patrick Rabou, Alexis Carlotti, Xavier Bonfils, Etienne Artigau, Philippe Vallee, Rene Doyon, Thierry Forveille, Eric Stadler, Yves Magnard, and Arthur Vigan "Experimental test of a 40 cm-long R=100 000 spectrometer for exoplanet characterisation", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107025Y (6 July 2018); https://doi.org/10.1117/12.2311696

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