On-sky performance of the QACITS pointing control technique with the Keck/NIRC2 vortex coronagraph
On-sky performance of the QACITS pointing control technique with the Keck/NIRC2 vortex coronagraph
A vortex coronagraph is now available for high contrast observations with the Keck/NIRC2 instrument at L band. Reaching the optimal performance of the coronagraph requires fine control of the wavefront incident on the phase mask. In particular, centering errors can lead to significant stellar light leakage that degrades the contrast …