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Proceedings Paper

SIOUX project: a simultaneous multiband camera for exoplanet atmospheres studies
Author(s): Jean Marc Christille; Aldo Stefano Bonomo; Francesco Borsa; Deborah Busonero; Paolo Calcidese; Riccardo Claudi; Mario Damasso; Paolo Giacobbe; Emilio Molinari; Emanuele Pace; Alberto Riva; Alesandro Sozzetti; Giorgio Toso; Daniela Tresoldi
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Paper Abstract

The exoplanet revolution is well underway. The last decade has seen order-of-magnitude increases in the number of known planets beyond the Solar system. Detailed characterization of exoplanetary atmospheres provide the best means for distinguishing the makeup of their outer layers, and the only hope for understanding the interplay between initial composition chemistry, temperature-pressure atmospheric profiles, dynamics and circulation. While pioneering work on the observational side has produced the first important detections of atmospheric molecules for the class of transiting exoplanets, important limitations are still present due to the lack of systematic, repeated measurements with optimized instrumentation at both visible (VIS) and near-infrared (NIR) wavelengths. It is thus of fundamental importance to explore quantitatively possible avenues for improvements. In this paper we report initial results of a feasibility study for the prototype of a versatile multi-band imaging system for very high-precision differential photometry that exploits the choice of specifically selected narrow-band filters and novel ideas for the execution of simultaneous VIS and NIR measurements. Starting from the fundamental system requirements driven by the science case at hand, we describe a set of three opto-mechanical solutions for the instrument prototype: 1) a radial distribution of the optical flux using dichroic filters for the wavelength separation and narrow-band filters or liquid crystal filters for the observations; 2) a tree distribution of the optical flux (implying 2 separate foci), with the same technique used for the beam separation and filtering; 3) an 'exotic' solution consisting of the study of a complete optical system (i.e. a brand new telescope) that exploits the chromatic errors of a reflecting surface for directing the different wavelengths at different foci. In this paper we present the first results of the study phase for the three solutions, as well as the results of two laboratory prototypes (related to the first two options), that simulate the most critical aspects of the future instrument.

Paper Details

Date Published: 9 August 2016
PDF: 15 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990857 (9 August 2016); doi: 10.1117/12.2233643
Show Author Affiliations
Jean Marc Christille, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta (Italy)
INAF - Osservatorio Astrofisico di Torino (Italy)
Aldo Stefano Bonomo, INAF - Osservatorio Astrofisico di Torino (Italy)
Francesco Borsa, INAF - Osservatorio Astronomico di Brera (Italy)
Deborah Busonero, INAF - Osservatorio Astrofisico di Torino (Italy)
Paolo Calcidese, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta (Italy)
Riccardo Claudi, INAF - Osservatorio Astronomico di Padova (Italy)
Mario Damasso, INAF - Osservatorio Astrofisico di Torino (Italy)
Paolo Giacobbe, INAF - Osservatorio Astrofisico di Torino (Italy)
Emilio Molinari, Fundación Galileo Galilei - INAF (Spain)
Emanuele Pace, Univ. degli Studi di Firenze (Italy)
Alberto Riva, INAF - Osservatorio Astrofisico di Torino (Italy)
Alesandro Sozzetti, INAF - Osservatorio Astrofisico di Torino (Italy)
Giorgio Toso, INAF - IASF Milano (Italy)
Daniela Tresoldi, INAF - IASF Milano (Italy)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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