21 July 2010 The data-reduction software for micro-arcsecond astrometry with PRIMA at the VLTI
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Abstract
PRIMA (Phase-Referenced Imaging and Microarcsecond Astrometry) is an ESO/VLTI instrument designed for phase-referenced imaging and narrow-angle astrometry, dedicated to exoplanet detection. The astrometric datareduction software (ADRS) is a key component of the system, calculating very precise (~ 10 μas) differential angular separations projected on the sky. For an interferometer with a baseline of 100 m, this separation corresponds to measuring the (differential) optical path difference with a precision of 5 - 15 nanometers. This precision can only be achieved with careful calibration of the instrument, including effects that are irrelevant for almost any other scientific application. PRIMA is currently being commissioned on Paranal, and we expect to obtain the first astrometric data in September 2010. These data will provide a new insight into the operation and calibration of the instrument.
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Rainer Koehler, Ingo Stilz, Andreas Quirrenbach, Adrian Kaminski, Tim Schulze-Hartung, Ralf Launhardt, Nicholas M. Elias, Thomas Henning, Didier Queloz, "The data-reduction software for micro-arcsecond astrometry with PRIMA at the VLTI", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77344B (21 July 2010); doi: 10.1117/12.857276; https://doi.org/10.1117/12.857276
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