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Proceedings Paper

The data-reduction software for micro-arcsecond astrometry with PRIMA at the VLTI
Author(s): Rainer Koehler; Ingo Stilz; Andreas Quirrenbach; Adrian Kaminski; Tim Schulze-Hartung; Ralf Launhardt; Nicholas M. Elias; Thomas Henning; Didier Queloz
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Paper 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.

Paper Details

Date Published: 22 July 2010
PDF: 7 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77344B (22 July 2010); doi: 10.1117/12.857276
Show Author Affiliations
Rainer Koehler, Zentrum für Astronomie der Univ. Heidelberg (Germany)
Max-Planck-Institut für Astronomie (Germany)
Ingo Stilz, Zentrum für Astronomie der Univ. Heidelberg (Germany)
Max-Planck-Institut für Astronomie (Germany)
Andreas Quirrenbach, Zentrum für Astronomie der Univ. Heidelberg (Germany)
Adrian Kaminski, Zentrum für Astronomie der Univ. Heidelberg (Germany)
Tim Schulze-Hartung, Max-Planck-Institut für Astronomie (Germany)
Ralf Launhardt, Max-Planck-Institut für Astronomie (Germany)
Nicholas M. Elias, National Radio Astronomy Observatory (United States)
Thomas Henning, Max-Planck-Institut für Astronomie (Germany)
Didier Queloz, Univ. of Geneva (Switzerland)


Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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