Direct Detection of Planets Orbiting Large Angular Diameter Stars

Details Direct Detection of Planets Orbiting Large Angular Diameter Stars Direct Detection of Planets Orbiting Large Angular Diameter Stars

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460605c&link_type=abstract

American Astronomical Society, AAS Meeting #214, #606.05

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We present calculations of the sensitivity of an internally-occulting, space-based coronagraph as a function of stellar angular diameter, from unresolved dwarfs to the largest evolved stars. We show that an assortment of band-limited image masks can accommodate a diverse set of observations to help maximize the scientific return of a TPF-C-like mission. We recommend two applications based on the results: the spectro-photometric study of planets already discovered with the radial velocity technique to orbit evolved stars, which we elucidate with the example of Pollux b, and the direct detection of planets orbiting our closest neighbor, Alpha Centauri, whose primary components are on the main-sequence but subtend an appreciable angle on the sky. In each case, an eighth-order mask provides a significant improvement in contrast over a fourth-order design. This benefit exceeds an order of magnitude for stars larger than 12 mas at visible wavelengths with an 8m telescope.

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