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9 July 2018 The GRAVITY fringe tracker: correlation between optical path residuals and atmospheric parameters
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Abstract
After the first year of observations with the GRAVITY fringe tracker, we compute correlations between the optical path residuals and atmospheric and astronomical parameters. The median residuals of the optical path residuals are 180nm on the ATs and 270nm on the UTs. The residuals are uncorrelated with the target magnitudes for Kmag below 5.5 on ATs (9 on UTs). The correlation with the coherence time is however extremely clear, with a drop-off in fringe tracking performance below 3 ms.
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© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Lacour, R. Dembet, R. Abuter, P. Fedou, G. Perrin, F. Eisenhauer, K. Perraut, C. Straubmeier, W. Brandner, and A. Amorim "The GRAVITY fringe tracker: correlation between optical path residuals and atmospheric parameters", Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 1070107 (9 July 2018); https://doi.org/10.1117/12.2313004
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