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Masques cachant des zones de la pupille, à l'entrée de l'objectif de l’instrument SPIRou

Four Hartmann masks are raised in succession to conceal four different areas of the pupil, at the entrance to the SPIRou (InfraRed SpectroPolarimeter) instrument’s objective. They enable various optical tests during the cryostat’s cryogenic cycle. SPIRou consists of a near-infrared spectropolarimeter combined with a high-precision velocimeter. Installed at the Cassegrain focus of the Canada-France-Hawaii Telescope (CFHT) at the end of 2017, SPIRou was designed to detect habitable Earth-twin exoplanets in the planetary systems of red dwarf stars in the vicinity of the Sun. It could also unravel the mysteries of the birth of stars and planets, by observing for the first time the magnetic fields of protostars aged just a few hundred thousand years.

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