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28 July 2008 AMBER closure and differential phases: accuracy and calibration with a beam commutation
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Abstract
The first astrophysical results of the VLTI focal instrument AMBER have shown the importance of the differential and closure phase measures, which are supposed to be much less sensitive to atmospheric and instrumental biases than the absolute visibility. However there are artifacts limiting the accuracy of these measures which can be substantially overcome by a specific calibration technique called Beam Commutation. This paper reports the observed accuracies on AMBER/VLTI phases in different modes, discusses some of the instrumental biases and shows the accuracy gain provided by Beam Commutation on the Differential Phase as well as on the Closure Phase.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Florentin Millour, Romain G. Petrov, Martin Vannier, and Stefan Kraus "AMBER closure and differential phases: accuracy and calibration with a beam commutation", Proc. SPIE 7013, Optical and Infrared Interferometry, 70131G (28 July 2008); https://doi.org/10.1117/12.788689
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