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High-order myopic coronagraphic phase diversity (COFFEE) for wave-front control in high-contrast imaging systems
B. Paul, L. M. Mugnier, J. -F. Sauvage +1
The estimation and compensation of quasi-static aberrations is mandatory to reach the ultimate performance of high-contrast imaging systems. COFFEE is a focal plane wave-front sens…
Performances tests on the SPHERE-IFS
Dino Mesa, Raffaele Gratton, Riccardo U. Claudi +13
Until now, just a few extrasolar planets (~30 out of 860) have been found through the direct imaging method. This number should greatly improve when the next generation of High Con…
Prospects of detecting the polarimetric signature of the Earth-mass planet alpha Centauri B b with SPHERE / ZIMPOL
Julien Milli, David Mouillet, Dimitri Mawet +5
Over the past five years, radial-velocity and transit techniques have revealed a new population of Earth-like planets with masses of a few Earth masses. Their very close orbit arou…
Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor
M. N'Diaye, K. Dohlen, T. Fusco +1
Context. Several exoplanet direct imaging instruments will soon be in operation. They use an extreme adaptive optics (XAO) system to correct the atmospheric turbulence and provide…
Apodization in high-contrast long-slit spectroscopy. Closer, deeper, fainter, cooler
A. Vigan, M. N'Diaye, K. Dohlen
The spectroscopy of faint planetary-mass companions to nearby stars is one of the main challenges that new-generation high-contrast spectro-imagers are going to face. In a previous…
Speckle temporal stability in XAO coronagraphic images II. Refine model for quasi-static speckle temporal evolution for VLT/SPHERE
P. Martinez, M. Kasper, A. Costille +4
Observing sequences have shown that the major noise source limitation in high-contrast imaging is due to the presence of quasi-static speckles. The timescale on which quasi-static…