{'fraction_non_alphanumeric': 0.01794616151545364, 'fraction_numerical': 0.0, 'mean_word_length': 5.783783783783784, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Spectral contrast enhancement techniques for extrasolar planet imaging

We use analytical models to characterize the optical response of observing systems and explore spectroscopic techniques that exploit the planetary spectral signature to enhance the planet-to-star contrast in imaging. Radiative transfer model calculations of gas-giant extrasolar planets are employed in selecting spectral regions where the planetary signal shows enhancement with respect to the stellar spectrum. We specifically discuss the use of frequency switching, in conjunction with pupil plane techniques (shaping, apodizing), to optimize the detection of the planetary signal of potential planetary systems for both ground-based and space-borne observations. Expected properties of known extrasolar planets motivate the use of the near-IR spectral region. This work was motivated by the focused technology development of a MEMS tunable filter, and the application of such devices to frequency-switched imaging spectroscopy.