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The afocal telescope of the ESA ARIEL mission: analysis of the layout
Author(s): Vania Da Deppo; Kevin Middleton; Mauro Focardi; Gianluca Morgante; Alain Jody Corso; Emanuele Pace; Riccardo Claudi; Giuseppina Micela
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Paper Abstract

ARIEL (Atmospheric Remote-sensing Infrared Exoplanet Large-survey) is one of the three present candidates as an M4 ESA mission to be launched in 2026. During its foreseen 3.5 years operation, it will observe spectroscopically in the infrared a large population of known transiting planets in the neighborhood of the Solar System. The aim is to enable a deep understanding of the physics and chemistry of these exoplanets. ARIEL is based on a 1-m class telescope ahead of a suite of instruments: two spectrometer channels covering the band 1.95 to 7.8 μm and four photometric channels (two wide and two narrow band) in the range 0.5 to 1.9 μm. The ARIEL optical design is conceived as a fore-module common afocal telescope that will feed the spectrometer and photometric channels. The telescope optical design is based on an eccentric pupil two-mirror classic Cassegrain configuration coupled to a tertiary paraboloidal mirror. The temperature of the primary mirror (M1) will be monitored and finely tuned by means of an active thermal control system based on thermistors and heaters. They will be switched on and off to maintain the M1 temperature within ±1 K thanks to a proportional–integral–derivative (PID) controller implemented within the Telescope Control Unit (TCU), a Payload electronics subsystem mainly in charge of the active thermal control of the two detectors owning to the spectrometer. TCU will collect the housekeeping data of the controlled subsystems and will forward them to the spacecraft (S/C) by means of the Instrument Control Unit (ICU), the main Payload’s electronic Unit linked to the S/C On Board Computer (OBC).

Paper Details

Date Published: 5 September 2017
PDF: 9 pages
Proc. SPIE 10398, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII, 1039812 (5 September 2017); doi: 10.1117/12.2273197
Show Author Affiliations
Vania Da Deppo, CNR-IFN Padova (Italy)
INAF - Osservatorio Astrofisico di Arcetri (Italy)
Kevin Middleton, STFC Rutherford Appleton Lab. (United Kingdom)
Mauro Focardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Gianluca Morgante, INAF - IASF Bologna (Italy)
Alain Jody Corso, CNR-IFN Padova (Italy)
Emanuele Pace, Univ. degli Studi di Firenze (Italy)
Riccardo Claudi, INAF - Osservatorio Astronomico di Padova (Italy)
Giuseppina Micela, INAF - Osservatorio Astronomico di Palermo (Italy)


Published in SPIE Proceedings Vol. 10398:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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