The light from extrasolar planets is expected to be partially polarized. The image of an extrasolar planet can be obtained from its polarized light with a polarization interferometric nulling coronagraph, where a four‐quadrant polarization mask is used. A two‐channel stellar coronagraph allows the detection of extrasolar planets by subtracting scattered light from its host star. Laboratory experiments confirm that faint extrasolar planets can be imaged with the two‐channel polarization nulling stellar coronagraph.
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Baba et al. (2003) studied this question.
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