AMBER closure and differential phases: accuracy and calibration with a Beam Commutation

Details AMBER closure and differential phases: accuracy and calibration with a Beam Commutation AMBER closure and differential phases: accuracy and calibration with a Beam Commutation

2008-06-30

arxiv.org/abs/0806.4833v2

Astronomy and Astrophysics

Astrophysics

This paper will be published in the proceeding of SPIE ``astronomical Telescopes and Instrumentation: Optical and Infrared Int

Scientific paper

10.1117/12.788689

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.

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