High-resolution spectroscopy of diffraction-limited sources: laboratory tests of an innovative near-IR demonstrator

Alexis Carlotti; David Mouillet; Alexis Bidot; Guillaume Bourdarot; Jean-Jacques Correia; Laurent Jocou; Alain Delboulbé; Etienne P. Le Coarer; René Doyon; Étienne Artigau; Philippe Vallée; Alain Roux; Philippe Feautrier; Patrick Rabou; Thierry Forveille; Xavier Bonfils; Guillaume Lo-Cascio; Ambarish Parthasarathy; Dimitri Mawet; Gautam Vasisht; Arthur Vigan; Gilles Otten

doi:10.1117/12.2560666

13 December 2020 High-resolution spectroscopy of diffraction-limited sources: laboratory tests of an innovative near-IR demonstrator

Alexis Carlotti, David Mouillet, Alexis Bidot, Guillaume Bourdarot, Jean-Jacques Correia, Laurent Jocou, Alain Delboulbé, Etienne P. Le Coarer, René Doyon, Étienne Artigau, Philippe Vallée, Alain Roux, Philippe Feautrier, Patrick Rabou, Thierry Forveille, Xavier Bonfils, Guillaume Lo-Cascio, Ambarish Parthasarathy, Dimitri Mawet, Gautam Vasisht, Arthur Vigan, Gilles Otten

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Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114512B (2020) https://doi.org/10.1117/12.2560666
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

Current high-resolution spectrometers have been designed for seeing-limited sources. Designing a spectrometer for diffraction-limited sources makes it possible to significantly improves its compacity and cost, but it also opens up new concepts, including better efficiency, and adaptability to various spectral domains, and up to very high resolution (several 10^5). A novel, near-IR, R~80000 spectrometer has been developed at IPAG to characterize two sources at once in the H or K bands. Its design is based on a virtually imaged phased array instead of an échelle grating, which allows the spectrometer to fit inside a 0.2m3 cryostat, and results in a gain in throughput with respect to usual échelle spectrographs. One specific science case that can benefit from this new type of design is the characterization of exoplanets' atmosphere. This paper presents the results of its test in the laboratory, as well as the preparation for an on-sky demonstration tentatively scheduled for summer 2020.

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Alexis Carlotti, David Mouillet, Alexis Bidot, Guillaume Bourdarot, Jean-Jacques Correia, Laurent Jocou, Alain Delboulbé, Etienne P. Le Coarer, René Doyon, Étienne Artigau, Philippe Vallée, Alain Roux, Philippe Feautrier, Patrick Rabou, Thierry Forveille, Xavier Bonfils, Guillaume Lo-Cascio, Ambarish Parthasarathy, Dimitri Mawet, Gautam Vasisht, Arthur Vigan, and Gilles Otten "High-resolution spectroscopy of diffraction-limited sources: laboratory tests of an innovative near-IR demonstrator", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114512B (13 December 2020); https://doi.org/10.1117/12.2560666

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KEYWORDS

Near infrared spectroscopy

Spectrometers

Spectroscopy

Atmospheric modeling

Exoplanets

K band

Optical design

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