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Proceedings Paper

Simulations of imperfect PRIMA fringe sensing units and calibration strategies
Author(s): Ronny Geisler; Nicholas M. Elias; Andreas Quirrenbach; Rainer Köhler; Robert N. Tubbs; Thomas Henning; Didier Queloz
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Paper Abstract

The PRIMA (Phase-Referenced Imaging and Microarcsecond Astrometry) instrument at ESO/VLTI is scheduled for commissioning in late 2008. It is designed for phased-referenced imaging and narrow-angle astrometry. The latter, which is the focus of this paper, may be used for exoplanet detection. A key PRIMA subsystem consists of two fringe sensing units. They employ polarized and dispersive optics to measure cross fluxes and differential phases in five narrow K band channels without the need of delay-line dithering. The differential phases are used to correct the differential delays, which are the primary observables used to determine relative proper motions, relative parallaxes, and planetary orbits. Real optical components are imperfect, which means that systematics will appear in the differential phases. In this paper, we 1) present a closed mathematical form for the differential phase, including small systematic offsets and random errors; 2) perform Monte Carlo simulations to understand how the small systematic offsets and random errors affect the differential phases; and 3) show that delay-line stepping can be used to eliminate the effects of small systematic offsets and random errors.

Paper Details

Date Published: 28 July 2008
PDF: 10 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 701344 (28 July 2008); doi: 10.1117/12.787817
Show Author Affiliations
Ronny Geisler, Zentrum für Astronomie, Univ. Heidelberg (Germany)
Max-Planck-Institut für Astronomie (Germany)
Nicholas M. Elias, Zentrum für Astronomie, Univ. Heidelberg (Germany)
Max-Planck-Institut für Astronomie (Germany)
Andreas Quirrenbach, Zentrum für Astronomie, Univ. Heidelberg (Germany)
Rainer Köhler, Zentrum für Astronomie, Univ. Heidelberg (Germany)
Max-Planck-Institut für Astronomie (Germany)
Robert N. Tubbs, Max-Planck-Institut für Astronomie (Germany)
Thomas Henning, Max-Planck-Institut für Astronomie (Germany)
Didier Queloz, Observatoire Astronomique de l'Univ. de Genève (Switzerland)


Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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