Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212..385c&link_type=abstract
Astrophysics and Space Science, vol. 212, nos. 1-2, p. 385-390
Astronomy and Astrophysics
Astrophysics
5
Astrometry, Atmospheric Effects, Atmospheric Turbulence, Extrasolar Planets, Infrared Interferometers, Accuracy, Detection, Error Analysis, Near Infrared Radiation
Scientific paper
Narrow-angle astrometry with long-baseline infrared interferometers can provide extremely high accuracies as required for indirect planet detection. Narrow-angle astrometric interferometry exploits the properties of atmospheric turbulence over fields smaller than the interferometer baseline divided by the atmospheric scale height. For such fields, accuracy is linear with star separation, and nearly inversely proportional to baseline length. To exploit these properties, the interferometer observes a relatively bright (less than 13 magK) target in the near infrared at 2.2 micrometers, and uses phase referencing to find a reference star within the 2.2-micrometers isoplanatic patch. With this technique faint references can be found for most targets. With baselines greater than 100 m, which also minimize photon-noise errors, and with careful control of systematic errors by using laser metrology, accuracies of tens of microarcseconds/square root of (hour) should be possible.
Colavita Mark M.
Shao Maxine
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