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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2011

Multi-stage four-quadrant phase mask: achromatic coronagraph for space-based and ground-based telescopes

Résumé

Context. Less than 3% of the known exoplanets were directly imaged for two main reasons. They are angularly very close to their parent star, which is several magnitudes brighter. Direct imaging of exoplanets thus requires a dedicated instrumentation with large telescopes and accurate wavefront control devices for high-angular resolution and coronagraphs for attenuating the stellar light. Coronagraphs are usually chromatic and they cannot perform high-contrast imaging over a wide spectral bandwidth. That chromaticity will be critical for future instruments.
Aims: Enlarging the coronagraph spectral range is a challenge for future exoplanet imaging instruments on both space- and ground-based telescopes.
Methods: We propose the multi-stage four-quadrant phase mask that associates several monochromatic four-quadrant phase mask coronagraphs in series. Monochromatic device performance has already been demonstrated and the manufacturing procedures are well-under control since their development for previous instruments on VLT and JWST. The multi-stage implementation simplicity is thus appealing.
Results: We present the instrument principle and we describe the laboratory performance for large spectral bandwidths and for both pupil shapes for space- (off-axis telescope) and ground-based (E-ELT) telescopes.
Conclusions: The multi-stage four-quadrant phase mask reduces the stellar flux over a wide spectral range and it is a very good candidate to be associated with a spectrometer for future exoplanet imaging instruments in ground- and space-based observatories.

Dates et versions

hal-03786436 , version 1 (23-09-2022)

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Raphaël Galicher, Pierre Baudoz, Jacques Baudrand. Multi-stage four-quadrant phase mask: achromatic coronagraph for space-based and ground-based telescopes. Astronomy and Astrophysics - A&A, 2011, 530, pp.43. ⟨10.1051/0004-6361/201116675⟩. ⟨hal-03786436⟩
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