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  Low wind effect on VLT/SPHERE: impact, mitigation strategy, and results

Milli, J., Kasper, M., Bourget, P., Pannetier, C., Mouillet, D., Sauvage, J.-.-F., et al. (2018). Low wind effect on VLT/SPHERE: impact, mitigation strategy, and results.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CC24-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CC25-C
Genre: Proceedings

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https://ui.adsabs.harvard.edu/abs/2018SPIE10703E..2AM (Any fulltext)
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 Creators:
Milli, J.1, Author
Kasper, M.1, Author
Bourget, P.1, Author
Pannetier, C.1, Author
Mouillet, D.1, Author
Sauvage, J. -F.1, Author
Reyes, C.1, Author
Fusco, T.1, Author
Cantalloube, F.1, Author
Tristam, K.1, Author
Wahhaj, Z.1, Author
Beuzit, J. -L.1, Author
Girard, J. H.1, Author
Mawet, D.1, Author
Telle, A.1, Author
Vigan, A.1, Author
N'Diaye, M.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: Astrophysics - Instrumentation and Methods for Astrophysics
 Abstract: The low wind effect is a phenomenon disturbing the phase of the wavefront in the pupil of a large telescope obstructed by spiders, in the absence of wind. It can be explained by the radiative cooling of the spiders, creating air temperature inhomogeneities across the pupil. Because it is unseen by traditional adaptive optics (AO) systems, thus uncorrected, it significantly degrades the quality of AO-corrected images. We provide a statistical analysis of the strength of this effect as seen by VLT/SPHERE after 4 years of operations. We analyse its dependence upon the wind and temperature conditions. We describe the mitigation strategy implemented in 2017: a specific coating with low thermal emissivity in the mid-infrared was applied on the spiders of Unit Telescope 3. We quantify the improvement in terms of image quality, contrast and wave front error using both focal plane images and measured phase maps.

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 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISBN: 9781510619593
 Degree: -

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Title: Adaptive Optics Systems VI
Place of Event: -
Start-/End Date: 2018

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