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End-to-end simulations of a near-infrared pyramid sensor on Keck II
Cédric Plantet, Guido Agapito, Christophe Giordano +3
The future upgrade of Keck II telescope's adaptive optics system will include a pyramid wavefront sensor working in the near-infrared (J and H band). It will benefit from the recen…
Adapting the pyramid wavefront sensor for pupil fragmentation of the ELT class telescopes
Nicolas Levraud, Vincent Chambouleyron, Olivier Fauvarque +8
The next generation of Extremely Large Telescope (24 to 39m diameter) will suffer from the so-called "pupil fragmentation" problem. Due to their pupil shape complexity (segmentatio…
Predictive wavefront control on Keck II adaptive optics bench: on-sky coronagraphic results
Maaike A. M. van Kooten, Rebecca Jensen-Clem Sylvain Cetre, Sam Ragland +3
The behavior of an adaptive optics (AO) system for ground-based high contrast imaging (HCI) dictates the achievable contrast of the instrument. In conditions where the coherence ti…
Status of predictive wavefront control on Keck II adaptive optics bench: on-sky coronagraphic results
Maaike A. M. van Kooten, Rebecca Jensen-Clem, Sylvain Cetre +4
The behavior of an adaptive optics (AO) system for ground-based high contrast imaging (HCI) dictates the achievable contrast of the instrument. In conditions where the coherence ti…
The Keck Planet Imager and Characterizer: A dedicated single-mode fiber injection unit for high resolution exoplanet spectroscopy
Jacques-Robert Delorme, Nemanja Jovanovic, Daniel Echeverri +28
The Keck Planet Imager and Characterizer (KPIC) is a purpose-built instrument to demonstrate new technological and instrumental concepts initially developed for the exoplanet direc…
Active deployable primary mirrors on CubeSat
Noah Schwartz, Maria Milanova, William Brzozowski +9
The volume available on small satellites restricts the size of optical apertures to a few centimetres, limiting the Ground-Sampling Distance (GSD) in the visible to typically 3 m a…
The Keck Planet Imager and Characterizer: Phase I fiber injection unit early performance and commissioning
Evan C. Morris, Jason J. Wang, Jean-Baptiste Ruffio +5
The Keck Planet Imager and Characterizer (KPIC) is an upgrade to the Keck II adaptive optics system and instrument suite with the goal of improving direct imaging and high-resoluti…
Enhanced high-dispersion coronagraphy with KPIC phase II: design, assembly and status of sub-modules
N. Jovanovic, B. Calvin, M. Porter +17
The Keck Planet Imager and Characterizer (KPIC) is a purpose-built instrument for high-dispersion coronagraphy in the K and L bands on Keck. This instrument will provide the first…
Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light
Thayne Currie, Eugene Pluzhnik, Olivier Guyon +15
Imaging planets in reflected light, a key focus of future NASA missions and ELTs, requires advanced wavefront control to maintain a deep, temporally correlated null of stellar halo…
Performance limits of adaptive-optics/high-contrast imagers with pyramid wave-front sensors
Carlos M. Correia, Olivier Fauvarque, Charlotte Z. Bond +3
Advanced AO systems will likely utilise Pyramid wave-front sensors (PWFS) over the traditional Shack-Hartmann sensor in the quest for increased sensitivity, peak performance and ul…
Status of the Keck Planet Imager and Characterizer Phase II Development
Jacklyn Pezzato, Nemanja Jovanovic, Dimitri Mawet +15
The Keck Planet Imager and Characterizer comprises of a series of upgrades to the Keck II adaptive optics system and instrument suite to improve the direct imaging and high resolut…
Demonstrating predictive wavefront control with the Keck II near-infrared pyramid wavefront sensor
Rebecca Jensen-Clem, Charlotte Z. Bond, Sylvain Cetre +5
The success of ground-based instruments for high contrast exoplanet imaging depends on the degree to which adaptive optics (AO) systems can mitigate atmospheric turbulence. While m…
The Keck Planet Imager and Characterizer: Demonstrating advanced exoplanet characterization techniques for future extremely large telescopes
N. Jovanovic, J. R. Delorme, C. Z. Bond +25
The Keck Planet Imager and Characterizer (KPIC) is an upgrade to the Keck II adaptive optics system enabling high contrast imaging and high-resolution spectroscopic characterizatio…
The vortex fiber nulling mode of the Keck Planet Imager and Characterizer (KPIC)
Daniel Echeverri, Garreth Ruane, Nemanja Jovanovic +8
The Keck Planet Imager and Characterizer (KPIC) is an upgrade to the Keck II adaptive optics system that includes an active fiber injection unit (FIU) for efficiently routing light…
Entering into the Wide Field Adaptive Optics Era on Maunakea
Gaetano Sivo, John Blakeslee, Jennifer Lotz +32
As part of the National Science Foundation funded "Gemini in the Era of MultiMessenger Astronomy" (GEMMA) program, Gemini Observatory is developing GNAO, a widefield adaptive optic…
Adaptive optics with programmable Fourier-based wavefront sensors: a spatial light modulator approach to the LOOPS testbed
Pierre Janin-Potiron, Vincent Chambouleyron, Lauren Schatz +10
Wavefront sensors encode phase information of an incoming wavefront into an intensity pattern that can be measured on a camera. Several kinds of wavefront sensors (WFS) are used in…
Modelling astronomical adaptive optics performance with temporally-filtered Wiener reconstruction of slope data
Carlos M. Correia, Charlotte Z. Bond, Jean-François Sauvage +3
We build on a long-standing tradition in astronomical adaptive optics (AO) of specifying performance metrics and error budgets using linear systems modeling in the spatial-frequenc…
Quantifying telescope phase discontinuities external to AO-systems by use of Phase Diversity and Focal Plane Sharpening
Masen Lamb, Carlos Correia, Jean-Francois Sauvage +7
We propose and apply two methods to estimate pupil plane phase discontinuities for two realistic scenarios on VLT and Keck. The methods use both Phase Diversity and a form of image…
Iterative wave-front reconstruction in the Fourier domain
Charlotte Z. Bond, Carlos M. Correia, Jean-François Sauvage +2
The use of Fourier methods in wave-front reconstruction can significantly reduce the computation time for large telescopes with a high number of degrees of freedom. However, Fourie…
Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +894
In this paper we present the results of a coherent narrow-band search for continuous gravitational-wave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In orde…