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Origin of the asymmetry of the wind driven halo observed in high contrast images
F. Cantalloube, E Por, K. Dohlen +9
The latest generation of high contrast instruments dedicated to exoplanets and circumstellar disks imaging are equipped with extreme adaptive optics and coronagraphs to reach contr…
Sensing and control of segmented mirrors with a pyramid wavefront sensor in the presence of spiders
Noah Schwartz, Jean-François Sauvage, Carlos Correia +9
The segmentation of the telescope pupil (by spiders & the segmented M4) create areas of phase isolated by the width of the spiders on the wavefront sensor (WFS), breaking the spati…
SPHERE / ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry
H. M. Schmid, A. Bazzon, R. Roelfsema +59
We describe the Zurich Imaging Polarimeter (ZIMPOL), the visual focal plane subsystem of the SPHERE "VLT planet finder", which pushes the limits of current AO systems to shorter wa…
Phase masks in astronomy: From the Mach-Zehnder interferometer to Coronographs
Kjetil Dohlen
Phase masks have numerous applications in astronomical optics, in particular related to two themes: coronography for detection and analysis of extrasolar planets or circumstellar d…
SPHERE on-sky performance compared with budget predictions
Kjetil Dohlen, Arthur Vigan, David Mouillet +21
The SPHERE (spectro-photometric exoplanet research) extreme-AO planet hunter saw first light at the VLT observatory on Mount Paranal in May 2014 after ten years of development. Gre…
The ELT-MOS (MOSAIC): towards the construction phase
Simon Morris, François Hammer, Pascal Jagourel +50
When combined with the huge collecting area of the ELT, MOSAIC will be the most effective and flexible Multi-Object Spectrograph (MOS) facility in the world, having both a high mul…
Opto-mechanical designs for the HARMONI Adaptive Optics systems
Kjetil Dohlen, Timothy Morris, Javier Piqueras Lopez +14
HARMONI is a visible and near-infrared integral field spectrograph equipped with two complementary adaptive optics systems, fully integrated within the instrument. A Single Conjuga…
Bringing high-spectral resolution to VLT/SPHERE with a fibre coupling to VLT/CRIRES+
A. Vigan, G. P. P. L. Otten, E. Muslimov +9
Atmospheric composition provides essential markers of the most fundamental properties of giant exoplanets, such as their formation mechanism or internal structure. New-generation e…
On-sky compensation of non-common path aberrations with the ZELDA wavefront sensor in VLT/SPHERE
A. Vigan, M. N'Diaye, K. Dohlen +7
Circumstellar environments are now routinely observed by dedicated high-contrast imagers on large, ground-based observatories. These facilities combine extreme adaptive optics and…
The adaptive optics modes for HARMONI: from Classical to Laser Assisted Tomographic AO
B. Neichel, T. Fusco, J. -F. Sauvage +25
HARMONI is a visible and NIR integral field spectrograph, providing the E-ELT's core spectroscopic capability at first light. HARMONI will work at the diffraction limit of the E-EL…
K-Stacker: Keplerian image recombination for the direct detection of exoplanets
M. Nowak, H. Le Coroller, L. Arnold +5
We present a proof of concept for a new algorithm which can be used to detect exoplanets in high contrast images. The algorithm properly combines mutliple observations acquired dur…
Laboratory verification of 'Fast & Furious' phase diversity: Towards controlling the low wind effect in the SPHERE instrument
Michael J. Wilby, Christoph U. Keller, Jean-Francois Sauvage +4
The low wind effect (LWE) refers to a characteristic set of quasi-static wavefront aberrations seen consistently by the SPHERE instrument when dome-level wind speeds drop below 3 m…