Comparing nonredundant masking and filled-aperture kernel phase for exoplanet detection and characterization

Abstract. The limitations of adaptive optics and coronagraph performance make exoplanet detection close to λ  /  D extremely difficult with conventional imaging methods. The technique of nonredundant masking (NRM), which turns a filled aperture into an interferometric array, has pushed the planet detection parameter space to within λ  /  D. For high Strehl, the related filled-aperture kernel phase technique can achieve resolution comparable to NRM, without the associated dramatic decrease in throughput. We present NRM and kernel phase contrast curves generated for ground- and space-based instruments. We use both real and simulated observations to assess the performance of each technique, and discuss their capabilities for different exoplanet science goals such as broadband detection and spectral characterization.

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