A search technique for planets in nearby binary stars using a ground-based interferometer

Physics

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Planetology: Solid Surface Planets: Instruments And Techniques, Planetology: Solid Surface Planets: Orbital And Rotational Dynamics, Planetology: Solid Surface Planets: Origin And Evolution

Scientific paper

A search for Jovian-type planets in 100 nearby binary stars could be carried out with the existing ground-based infrared-optical telescope array (IOTA) interferometer. We would study binaries with sufficiently great separation (25-50 AU; typical separation around 0.4 arcsec) that such a planet could be in a stable orbit about one member of the pair. The method is to measure the angular separation of stars in each binary, with a single-measurement accuracy sufficient to detect the amplitude of a Uranus orbiting one of the stars. The technique is based on an auxiliary device, the pupil-splitting interferometer (PSI), which substantially reduces systematic and random errors by converting a measurement of angular separation into a measurement of the differential optical delay between the two components of the binary. The program would be relatively economical, and could begin soon.

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