Imaging circumstellar environments with a nulling interferometer

Article Abstract:

Extrasolar planets have to be imaged directly so that their nature can be better understood, but the bright light from the parent star can overwhelm nearby faint sources. A method of selectively removing starlight before detection was proposed by Bracewell, by superposing light from two telescopes so that stellar wavefronts interfere destructively. Mid-infrared observations using two telescopes of the Multiple Mirror Telescope are reported, demonstrating the viability of the technique.

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Interferometric radar measurements of water level changes on the Amazon flood plain

Article Abstract:

Interferometric synthetic aperture radar (SAR) data was used to measure water level changes in flooded areas on the Amazon flood plain. Proximal floodplain observations were in accordance with main-channel gauge records, suggesting the rapid response of the flood plain to falls in river stage.

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Deep and stable interferometric nulling of broadband light with implications for observing planets around nearby stars

Article Abstract:

Reported here is the deep and stable interferometric nulling of broadband thermal light. An astronomical instrument is constructed as a prototype.

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