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View article: Coherent differential imaging of high-contrast extended sources with VLT/SPHERE
Coherent differential imaging of high-contrast extended sources with VLT/SPHERE Open
Context . High-contrast imaging relies on advanced coronagraphs and adaptive optics (AO) to attenuate the starlight. However, residual aberrations, especially non-common path aberrations between the AO channel and the coronagraph channel, …
View article: The programmable liquid-crystal active coronagraphic imager for the 4-m DAG telescope (PLACID) instrument: installation and commissioning update
The programmable liquid-crystal active coronagraphic imager for the 4-m DAG telescope (PLACID) instrument: installation and commissioning update Open
The Programmable Liquid-crystal Active Coronagraphic Imager for the DAG telescope (PLACID) instrument is a novel high-contrast direct imaging facility that was recently installed on the new Turkish 4-m DAG telescope. In brief, PLACID consi…
View article: The Programmable Liquid-crystal Active Coronagraphic Imager for the 4-m DAG telescope (PLACID) instrument: Discovery Space and Status
The Programmable Liquid-crystal Active Coronagraphic Imager for the 4-m DAG telescope (PLACID) instrument: Discovery Space and Status Open
The Programmable Liquid-crystal Active Coronagraphic Imager for the DAG telescope (PLACID) will be the world’s first ever “adaptive stellar coronagraph” facility – with “adaptive” referring to the instrument’s unique ability to adjust in r…
View article: Simulating Pixelated Focal-Plane Phase Masks for Coronagraphic High-Contrast Imaging
Simulating Pixelated Focal-Plane Phase Masks for Coronagraphic High-Contrast Imaging Open
Recent advancements in high-contrast exoplanet imaging have opened the door to adaptive coronagraphy, a new approach that leverages the use of active optical components to dynamically adapt to science goals or observing conditions, for exa…
View article: Extended linearity in the high-order wavefront sensor for the Roman Coronagraph
Extended linearity in the high-order wavefront sensor for the Roman Coronagraph Open
Context . The aim of the Coronagraphic Instrument (CGI) on board the Roman Space Telescope is to achieve unprecedented levels of contrast for the direct imaging of exoplanets, which will serve as a critical technology demonstrator for futu…
View article: Extended Linearity in the High-Order Wavefront Sensor for the Roman Coronagraph
Extended Linearity in the High-Order Wavefront Sensor for the Roman Coronagraph Open
Context. The Coronagraphic Instrument (CGI) on the Roman Space Telescope aims for unprecedented contrast for direct imaging of exoplanets, serving as a critical tech demo for future missions like the Habitable Worlds Observatory. This requ…
View article: Advancing European high-contrast imaging R&D towards the Habitable Worlds Observatory
Advancing European high-contrast imaging R&D towards the Habitable Worlds Observatory Open
The Habitable Worlds Observatory (HWO) will enable a transformative leap in the direct imaging and characterization of Earth-like exoplanets. For this, NASA is focusing on early investment in technology development prior to mission definit…
View article: Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging
Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging Open
Direct imaging of exoplanets relies on complex wavefront sensing and control architectures. In addition to fast adaptive optics systems, most of the future high-contrast imaging instruments will soon be equipped with focal plane wavefront …
View article: The programmable liquid-crystal active coronagraphic imager for the DAG telescope (PLACID) instrument: on-site status update ahead of first light
The programmable liquid-crystal active coronagraphic imager for the DAG telescope (PLACID) instrument: on-site status update ahead of first light Open
The Programmable Liquid-crystal Active Coronagraphic Imager for the DAG telescope (PLACID) instrument is a novel high-contrast direct imaging facility that was recently delivered to the Turkish 4-m DAG telescope, with first light anticipat…
View article: The Programmable Liquid-crystal Active Coronagraphic Imager for the DAG telescope (PLACID) instrument: simulations, discovery space and status update 
The Programmable Liquid-crystal Active Coronagraphic Imager for the DAG telescope (PLACID) instrument: simulations, discovery space and status update  Open
We present the Programmable Liquid-crystal Active Coronagraphic Imager for the DAG telescope (PLACID) instrument, a novel exoplanet direct imaging facility that was recently delivered to the Turkish 4-m DAG telescope, with first light anti…
View article: Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction
Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction Open
SAXO+ is a planned enhancement of the existing SAXO, the VLT/ SPHERE adaptive optics system, deployed on ESO's Very Large Telescope. This upgrade is designed to significantly enhance the instrument's capacity to detect and analyze young Ju…
View article: Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction
Upgrading SPHERE with the second stage AO system SAXO+: non-common path aberrations estimation and correction Open
SAXO+ is a planned enhancement of the existing SAXO, the VLT/ SPHERE adaptive optics system, deployed on ESO's Very Large Telescope. This upgrade is designed to significantly enhance the instrument's capacity to detect and analyze young Ju…
View article: Discovery space and science with the PLACID stellar coronagraph
Discovery space and science with the PLACID stellar coronagraph Open
The world's first ever ''adaptive stellar coronagraph'' facility will be the\nPLACID instrument, installed on Turkey's new national observatory 4-m DAG\ntelescope. PLACID incorporates a customized spatial light modulator (SLM)\nacting as a…
View article: Future exoplanet direct imaging instruments: simulating spatial light modulator-based pixelated focal-plane coronagraphy
Future exoplanet direct imaging instruments: simulating spatial light modulator-based pixelated focal-plane coronagraphy Open
The programmable Liquid-crystal Active Coronagraphic Imager for the DAG\nTelescope (PLACID) instrument will be installed on the Turkish 4-m Telescope by\nthe fall of 2024 and is expected to be on-sky by the end of the year. PLACID\nwill be…
View article: Increasing the raw contrast of VLT/SPHERE with dark hole techniques III. Broadband reference differential imaging of HR\,4796 using a four-quadrant phase mask
Increasing the raw contrast of VLT/SPHERE with dark hole techniques III. Broadband reference differential imaging of HR\,4796 using a four-quadrant phase mask Open
Imaging exoplanetary systems is essential to characterizing exoplanetary systems and to studying planet-disk interactions to understand planet formation. Such imaging in the visible and near-infrared is challenging because these objects ar…
View article: Increasing the raw contrast of VLT/SPHERE with the dark hole technique
Increasing the raw contrast of VLT/SPHERE with the dark hole technique Open
Context . Imaging exoplanetary systems is essential to characterizing exoplanet atmospheres and orbits as well as circumstellar disks and to studying planet-disk interactions to understand the planet formation processes. Imaging exoplanets…
View article: Experimental demonstration of spectral linear dark field control at NASA's high contrast imaging testbeds
Experimental demonstration of spectral linear dark field control at NASA's high contrast imaging testbeds Open
Due to the low flux of exoEarths, long exposure times are required to spectrally characterize them. During these long exposures, the contrast in the dark hole will degrade as the the optical system drifts from its initial DH state. To prev…
View article: Comparative laboratory study of electric field conjugation algorithms
Comparative laboratory study of electric field conjugation algorithms Open
Future space telescope coronagraph instruments hinge on the integration of high-performance masks and precise wavefront sensing and control techniques to create dark holes essential for exoplanet detection. Recent advancements in wavefront…
View article: Laboratory demonstration of the triple-grating vector vortex coronagraph
Laboratory demonstration of the triple-grating vector vortex coronagraph Open
The future Habitable Worlds Observatory aims to characterize the atmospheres of rocky exoplanets around solar-type stars. The vector vortex coronagraph (VVC) is a main candidate to reach the required contrast of $10^{-10}$. However, the VV…
View article: Laboratory demonstration of the triple-grating vector vortex coronagraph
Laboratory demonstration of the triple-grating vector vortex coronagraph Open
The future Habitable Worlds Observatory aims to characterize the atmospheres of rocky exoplanets around solar-type stars. The vector vortex coronagraph (VVC) is a main candidate to reach the required contrast of 10−10. However, the VVC req…
View article: Random vibration testing of microelectromechanical deformable mirrors for space-based high-contrast imaging
Random vibration testing of microelectromechanical deformable mirrors for space-based high-contrast imaging Open
Space-based stellar coronagraph instruments aim to directly image exoplanets\nthat are a fraction of an arcsecond separation and ten billion times fainter\nthan their host star. To achieve this, one or more deformable mirrors (DMs) are\nus…
View article: Laboratory demonstration of the wrapped staircase scalar vortex coronagraph
Laboratory demonstration of the wrapped staircase scalar vortex coronagraph Open
Of the over 5000 exoplanets that have been detected, only about a dozen have\never been directly imaged. Earth-like exoplanets are on the order of 10 billion\ntimes fainter than their host star in visible and near-infrared, requiring a\nco…
View article: Adaptive optics performance of a simulated coronagraph instrument on a large, segmented space telescope in steady state
Adaptive optics performance of a simulated coronagraph instrument on a large, segmented space telescope in steady state Open
Directly imaging Earth-like exoplanets (``exoEarths'') with a coronagraph instrument on a space telescope requires a stable wavefront with optical path differences limited to tens of picometers RMS during exposure times of a few hours. Whi…
View article: Increasing the raw contrast of VLT/SPHERE with the dark hole technique
Increasing the raw contrast of VLT/SPHERE with the dark hole technique Open
Context . Direct imaging of exoplanets takes advantage of state-of-the-art adaptive optics (AO) systems, coronagraphy, and postprocessing techniques. Coronagraphs attenuate starlight to mitigate the unfavorable flux ratio between an exopla…
View article: Increasing the raw contrast of VLT/SPHERE with the dark-hole technique. II. On-sky wavefront correction and coherent differential imaging
Increasing the raw contrast of VLT/SPHERE with the dark-hole technique. II. On-sky wavefront correction and coherent differential imaging Open
Context. Direct imaging of exoplanets takes advantage of state-of-the-art adaptive optics (AO) systems, coronagraphy, and post-processing techniques. Coronagraphs attenuate starlight to mitigate the unfavorable flux ratio between an exopla…
View article: Improving VLT/SPHERE without additional hardware: comparing quasi-static correction strategies
Improving VLT/SPHERE without additional hardware: comparing quasi-static correction strategies Open
Direct imaging is the primary technique currently used to detect young and\nwarm exoplanets and understand their formation scenarios. The extreme flux\nratio between an exoplanet and its host star requires the use of coronagraphs\nto atten…
View article: Contrast performance of an 8m off-axis, segmented space telescope equipped with an adaptive optics system
Contrast performance of an 8m off-axis, segmented space telescope equipped with an adaptive optics system Open
The Astro2020 decadal survey recommended an infrared, optical, ultra-violet (IR/O/UV) telescope with a $\sim$6~m inscribed diameter and equipped with a coronagraph instrument to directly image exoEarths in the habitable zone of their host …
View article: Contrast performance of an 8m off-axis, segmented space telescope equipped with an adaptive optics system
Contrast performance of an 8m off-axis, segmented space telescope equipped with an adaptive optics system Open
The Astro2020 decadal survey recommended an infrared, optical, ultra-violet (IR/O/UV) telescope with a ∼6 m inscribed diameter and equipped with a coronagraph instrument to directly image exoEarths in the habitable zone of their host star.…
View article: In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086 Open
Context. HD 95086 is a young nearby Solar System analog hosting a giant exoplanet orbiting at 57 au from the star between an inner and outer debris belt. The existence of additional planets has been suggested as the mechanism that maintain…
View article: New binaries from the SHINE survey
New binaries from the SHINE survey Open
We present the multiple stellar systems observed within the SpHere INfrared survey for Exoplanet (SHINE). SHINE searched for sub-stellar companions to young stars using high contrast imaging. Although stars with known stellar companions wi…