English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Modeling the optical point spread function (PSF) is particularly challengingfor adaptive optics (AO)-assisted observations owing to the its complex shapeand spatial variations. We aim to (i) exhaustively demonstrate the accuracy ofa recent analytical model from comparison with a large sample of imaged PSFs,(ii) assess the conditions for which the model is optimal, and (iii) unleashthe strength of this framework to enable the joint estimation of atmosphericparameters, AO performance and static aberrations. We gathered 4812 on-sky PSFsobtained from seven AO systems and used the same fitting algorithm to test themodel on various AO PSFs and diagnose AO performance from the model outputs.Finally, we highlight how this framework enables the characterization of theso-called low wind effect on the SPHERE instrument and piston cophasing errorson the Keck II telescope. Over 4812 PSFs, the model reaches down to 4% of erroron both the Strehl-ratio (SR) and full width at half maximum (FWHM). Weparticularly illustrate that the estimation of the Fried parameter, which isone of the model parameters, is consistent with known seeing statistics andfollows expected trends in wavelength using the MUSE instrument($\lambda^{6/5}$) and field (no variations) from GSAOI images with a standarddeviation of 0.4cm. Finally, we show that we can retrieve a combination ofdifferential piston, tip, and tilt modes introduced by the LWE that compares toZELDA measurements, as well as segment piston errors from the Keck II telescopeand particularly the stair mode that has already been revealed from previousstudies. This model matches all types of AO PSFs at the level of 4% error andcan be used for AO diagnosis, post-processing, and wavefront sensing purposes.

astronomy and astrophysics

Joint estimation of atmospheric and instrumental defects using a  parsimonious point spread function model.On-sky validation using state of the  art worldwide adaptive-optics assisted instruments