APIC: Absolute Position Interfero Coronagraph for direct exoplanet detection: first laboratory results

Fatmé Allouche; Andreas Glindemann; Eric Aristidi; Farrokh Vakili

doi:10.1117/12.859672

20 July 2010 APIC: Absolute Position Interfero Coronagraph for direct exoplanet detection: first laboratory results

Fatmé Allouche, Andreas Glindemann, Eric Aristidi, Farrokh Vakili

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 773587 (2010) https://doi.org/10.1117/12.859672
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

For the detection and direct imaging of exoplanets, when the intensity ratio between a star and its orbiting planet can largely exceed 106, coronagraphic methods are mandatory. In 1996, a concept of achromatic interferocoronagraph (AIC) was presented by J. Gay and Y. Rabbia for the detection of very faint stellar companions, such as exoplanets. In an earlier paper, we presented a modified version of the AIC permitting to determine the relative position of these faint companions with respect to the parent star, a problem unsolved in the original design of the AIC. Our modification lied in the use of cylindrical lens doublets as field rotator. By placing two of them in one arm of the interferometric set-up of AIC, we destroyed the axis of symmetry induced by the AIC's original design. Our theoretical study, along with the numerical computations, presented then, and the preliminary test bench results aiming at validating the cylindrical lens doublet field rotation capability, presented in this paper, show that the axis of symmetry is destroyed when one of the cylindrical doublets is rotated around the optic axis.

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Fatmé Allouche, Andreas Glindemann, Eric Aristidi, and Farrokh Vakili "APIC: Absolute Position Interfero Coronagraph for direct exoplanet detection: first laboratory results", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773587 (20 July 2010); https://doi.org/10.1117/12.859672

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KEYWORDS

Coronagraphy

Stars

Planets

Beam splitters

Telescopes

Wavefronts

Exoplanets

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