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The Low Wind Effect (LWE) refers to a phenomenon that occurs when the windspeed inside a telescope dome drops below $3$m/s creating a temperaturegradient near the telescope spider. This produces phase discontinuities in thepupil plane that are not detected by traditional Adaptive Optics (AO) systemssuch as the pyramid wavefront sensor or the Shack-Hartmann. Considering thepupil as divided in 4 quadrants by regular spiders, the phase discontinuitiescorrespond to piston, tip and tilt aberrations in each quadrant of the pupil.Uncorrected, it strongly decreases the ability of high contrast imaginginstruments utilizing coronagraphy to detect exoplanets at small angularseparations. Multiple focal plane wavefront sensors are currently beingdeveloped and tested on the Subaru Coronagraphic Extreme Adaptive Optics(SCExAO) instrument at Subaru Telescope: Among them, the Zernike AsymmetricPupil (ZAP) wavefront sensor already showed on-sky that it could measure theLWE induced aberrations in focal plane images. The Fast and Furious algorithm,using previous deformable mirror commands as temporal phase diversity, showedin simulations its efficiency to improve the wavefront quality in the presenceof LWE. A Neural Network algorithm trained with SCExAO telemetry showedpromising PSF prediction on-sky. The Linearized Analytic Phase Diversity (LAPD)algorithm is a solution for multi-aperture cophasing and is studied to correctfor the LWE aberrations by considering the Subaru Telescope as a 4 sub-apertureinstrument. We present the different algorithms, show the latest results andcompare their implementation on SCExAO/SUBARU as real-time wavefront sensorsfor the LWE compensation.

Overview of focal plane wavefront sensors to correct for the Low Wind Effect on SUBARU/SCExAO