Angular Differential Imaging: a Powerful High-Contrast Imaging Technique

Abstract

Angular differential imaging is a high-contrast imaging technique that reduces quasi-static speckle noise and facilitates the detection of nearby companions. A sequence of images is acquired with an altitude/azimuth telescope while the instrument field derotator is switched off. This keeps the instrument and telescope optics aligned and allows the field of view to rotate with respect to the instrument. For each image, a reference PSF is constructed from other appropriately-selected images of the same sequence and subtracted to remove quasi-static PSF structure. All residual images are then rotated to align the field and are combined. Observed performances are reported for Gemini North data. It is shown that quasi-static PSF noise can be reduced by a factor \~5 for each image subtraction. The combination of all residuals then provides an additional gain of the order of the square root of the total number of acquired images. A total speckle noise attenuation of 20-50 is obtained for one-hour long observing sequences compared to a single 30s exposure. A PSF noise attenuation of 100 was achieved for two-hour long sequences of images of Vega, reaching a 5-sigma contrast of 20 magnitudes for separations greater than 8". For a 30-minute long sequence, ADI achieves 30 times better signal-to-noise than a classical observation technique. The ADI technique can be used with currently available instruments to search for ~1MJup exoplanets with orbits of radii between 50 and 300 AU around nearby young stars. The possibility of combining the technique with other high-contrast imaging methods is briefly discussed.

27 pages, 7 figures, accepted for publication in ApJ

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• A High-Contrast Search for Variability in HR 8799bc with VLT-SPHERE
• Direct Imaging Constraints on the Putative Exoplanet 14 Her c
• Molecule mapping of HR8799b using OSIRIS on Keck: Strong detection of water and carbon monoxide, but no methane
• Kernel-nulling for a robust direct interferometric detection of extrasolar planets
• Utilization of the Wavefront Sensor and Short-Exposure Images for Simultaneous Estimation of Quasi-static Aberration and Exoplanet Intensity
• Thermal Infrared Constraint to a Planetary Companion of Vega with the MMT Adaptive Optics System
• Searching for proto-planets with MUSE
• NACO-SDI direct imaging search for the exoplanet Eps Eri b
• Planets Around Low-Mass Stars (PALMS). V. Age-Dating Low-Mass Companions to Members and Interlopers of Young Moving Groups
• Sequential Covariance Calculation for Exoplanet Image Processing
• WIde Separation Planets In Time (WISPIT): A Gap-clearing Planet in a Multi-ringed Disk around the Young Solar-type Star WISPIT 2
• Very deep images of the innermost regions of the beta Pictoris debris disc at Lp
• Searching for young Jupiter analogs around AP Col: L-band high-contrast imaging of the closest pre-main sequence star
• Revisiting the atmosphere of the exoplanet 51 Eridani b with VLT/SPHERE
• Exoplanets with ELT-METIS I: Estimating the direct imaging exoplanet yield around stars within 6.5 parsecs
• SPOTS: The Search for Planets Orbiting Two Stars. III. Complete Sample and Statistical Analysis
• Dynamical Mass Measurement of the Young Spectroscopic Binary V343 Normae AaAb Resolved With the Gemini Planet Imager
• Is the HD 15115 inner disk really asymmetrical ?
• Keck/NIRC2 Imaging of the Warped, Asymmetric Debris Disk around HD 32297
• Eccentricity in planetary systems and the role of binarity: sample definition, initial results, and the system of HD 211847
• Detection of Sharp Symmetric Features in the Circumbinary Disk Around AK Sco
• BEAST begins: Sample characteristics and survey performance of the B-star Exoplanet Abundance Study
• MINDS: JWST/NIRCam imaging of the protoplanetary disk PDS 70
• Investigating the presence of two belts in the HD 15115 system
• SPOTS: The Search for Planets Orbiting Two Stars. I. Survey description and first observations
• The Performance of the Robo-AO Laser Guide Star Adaptive Optics System at the Kitt Peak 2.1-m Telescope
• Towards on-sky adaptive optics control using reinforcement learning
• Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager
• Kernel phase imaging with VLT/NACO: high-contrast detection of new candidate low-mass stellar companions at the diffraction limit
• The First Scattered Light Image of the Debris Disk around the Sco-Cen target HD 129590
• Focal-plane wavefront sensing with photonic lanterns I: theoretical framework
• The Lyot Project Direct Imaging Survey of Substellar Companions: Statistical Analysis and Information from Nondetections
• Subaru/HiCIAO $H{K}_{\mathrm{s}}$ imaging of LkH$\alpha$ 330 - multi-band detection of the gap and spiral-like structures
• Implicit electric field Conjugation: Data-driven focal plane control
• A single-armed spiral in the protoplanetary disk around HD34282 ?
• A Decade of MWC 758 Disk Images: Where Are the Spiral-Arm-Driving Planets?
• High contrast imaging at 10 microns, a search for exoplanets around: Eps Indi A, Eps Eri, Tau Ceti, Sirius A and Sirius B
• Extreme AO Observations of Two Triple Asteroid Systems with SPHERE
• Characterization of low-mass companion HD 142527 B
• Completeness of Imaging Surveys for Eccentric Exoplanets
• Searching for H${}_{\alpha }$-emitting sources in the gaps of five transitional disks. SPHERE/ZIMPOL high-contrast imaging
• Exploring the RCrA environment with SPHERE: Discovery of a new stellar companion
• REXPACO: an algorithm for high contrast reconstruction of the circumstellar environment by angular differential imaging
• Focal plane wavefront sensor achromatization : The multireference self-coherent camera
• A "Rosetta Stone" for protoplanetary disks: The synergy of multi-wavelength observations
• The Gemini NICI Planet-Finding Campaign: The Offset Ring of HR 4796 A
• Searching for Planets in Holey Debris Disks with the Apodizing Phase Plate
• GW Ori: circumtriple rings and planets
• ISPY-NACO Imaging Survey for Planets around Young stars. The demographics of forming planets embedded in protoplanetary disks
• HD 104860 and HD 192758: two debris disks newly imaged in scattered-light with HST
• High-Contrast 3.8 Micron Imaging Of The Brown Dwarf/Planet-Mass Companion to GJ 758
• The vector-apodizing phase plate coronagraph: design, current performance, and future development
• Determining mass limits around HD163296 through SPHERE direct imaging data
• The search for disks or planetary objects around directly imaged companions: A candidate around DH Tau B
• Characterizing HR3549B using SPHERE
• The McDonald Accelerating Stars Survey (MASS): White Dwarf Companions Accelerating the Sun-like Stars 12 Psc and HD 159062
• Improved achromatization of phase mask coronagraphs using colored apodization
• Search for cool giant exoplanets around young and nearby stars - VLT/NaCo near-infrared phase-coronagraphic and differential imaging
• Minimizing the polarization leakage of geometric-phase coronagraphs with multiple grating pattern combinations
• Gemini Planet Imager Spectroscopy of the Dusty Substellar Companion HD 206893 B
• Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS
• Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B
• Atmospheric Monitoring and Precise Spectroscopy of the HR 8799 Planets with SCExAO/CHARIS
• Precise radial velocities of giant stars IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system
• A Substellar Common Proper Motion Companion to the Pleiad HII 1348
• The Geneva Reduction and Analysis Pipeline for High-contrast Imaging of planetary Companions
• SCExAO and GPI $YJH$ Band Photometry and Integral Field Spectroscopy of the Young Brown Dwarf Companion to HD 1160
• Dynamical Mass of the Exoplanet Host Star HR 8799
• Characterizing the Atmospheres of the HR8799 Planets with HST/WFC3
• SCExAO/CHARIS Near-IR High-Contrast Imaging and Integral Field Spectroscopy of the HIP 79977 Debris Disk
• Discovery of a low-mass companion around HR3549
• Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
• Discovery of a Low-Mass Companion to the F7V star HD 984
• MMT/AO 5 micron Imaging Constraints on the Existence of Giant Planets Orbiting Fomalhaut at ~13-40 AU
• Clearing residual planetesimals by sweeping secular resonances in transitional disks: a lone-planet scenario for the wide gaps in debris disks around Vega and Fomalhaut
• Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
• SCExAO/MEC and CHARIS Discovery of a Low Mass, 6 AU-Separation Companion to HIP 109427 using Stochastic Speckle Discrimination and High-Contrast Spectroscopy
• Searching for H${}_{\alpha }$ emitting sources around MWC758: SPHERE/ZIMPOL high-contrast imaging
• A dusty benchmark brown dwarf near the ice line of HD 72946
• An updated visual orbit of the directly-imaged exoplanet 51 Eridani b and prospects for a dynamical mass measurement with Gaia
• Search for Outer Massive Bodies around Transiting Planetary Systems: Candidates of Faint Stellar Companions around HAT-P-7
• Octofitter: Fast, Flexible, and Accurate Orbit Modelling to Detect Exoplanets
• Independent confirmation of β Pictoris b imaging with NICI
• Focal-plane wavefront sensing with the vector Apodizing Phase Plate
• Coronagraphic Low Order Wave Front Sensor : post-processing sensitivity enhancer for high performance coronagraphs
• ALICE Data Release: A revaluation of HST-NICMOS coronagraphic images
• Imaging search for the unseen companion to Eps Ind A -- Improving the detection limits with 4 micron observations
• Polarimetry and flux distribution in the debris disk around HD 32297
• On-sky verification of Fast and Furious focal-plane wavefront sensing: Moving forward toward controlling the island effect at Subaru/SCExAO
• VLT/SPHERE Multi-Wavelength High-Contrast Imaging of the HD 115600 Debris Disk: New Constraints on the Dust Geometry and the Presence of Young Giant Planets
• A Family of Phase Masks For Broadband Coronagraphy Example of the Wrapped Vortex Phase Mask Theory and Laboratory demonstration
• Integral Field Spectroscopy of the Low-Mass Companion HD984B with the Gemini Planet Imager
• The McDonald Accelerating Stars Survey (MASS): Discovery of a Long-Period Substellar Companion Orbiting the Old Solar Analog HD 47127
• Simulated performance of the molecular mapping for young giant exoplanets with the Medium Resolution Spectrometer of JWST/MIRI
• Imaging exoplanets with coronagraphic instruments
• Dark Hole Maintenance and A Posteriori Intensity Estimation in the Presence of Speckle Drift in a High-Contrast Space Coronagraph
• Reference-less detection, astrometry, and photometry of faint companions with adaptive optics
• Comprehensive analysis of HD 105, a young Solar System analog
• Signs of late infall and possible planet formation around DR Tau using VLT/SPHERE and LBTI/LMIRCam
• MagAO Imaging of Long-period Objects (MILO). I. A Benchmark M Dwarf Companion Exciting a Massive Planet around the Sun-like Star HD 7449
• Comparing Apples with Apples: Robust Detection Limits for Exoplanet High-Contrast Imaging in the Presence of non-Gaussian Noise
• Most EL CVn systems are inner binaries of hierarchical triples
• Surveying Nearby Brown Dwarfs with HGCA: Direct Imaging Discovery of a Faint, High-Mass Brown Dwarf Orbiting HD 176535 A
• The TRENDS High-Contrast Imaging Survey. II. Direct Detection of the HD 8375 Tertiary
• Deep orbital search for additional planets in the HR 8799 system
• Searching for gas giant planets on Solar System scales - A NACO/APP L'-band survey of A- and F-type Main Sequence stars
• Piercing the Glare: Direct Imaging Search for Planets in the Sirius System
• Increasing the raw contrast of VLT/SPHERE with the dark hole technique. I. Simulations and validation on the internal source
• Characterization of the K2-19 Multiple-Transiting Planetary System via High-Dispersion Spectroscopy, AO Imaging, and Transit Timing Variations
• Imaging radial velocity planets with SPHERE
• Efficiently Imaging Accreting Protoplanets from Space: Reference Star Differential Imaging of the PDS 70 Planetary System using the HST/WFC3 Archival PSF Library
• Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry
• First Resolved Scattered-Light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager
• The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?
• Orbiting a binary: SPHERE characterisation of the HD 284149 system
• Coronagraphic Search for Extra-Solar Planets around epsilon Eri and Vega
• Stirred but not shaken: a multi-wavelength view of HD 16743's debris disc
• Constraining the presence of giant planets in two-belt debris disk systems with VLT/SPHERE direct imaging and dynamical arguments
• A Bayesian Framework for Exoplanet Direct Detection and Non-Detection
• Laboratory and On-Sky Validation of the Shaped Pupil Coronagraph's Sensitivity to Low-Order Aberrations With Active Wavefront Control
• Mid-Infrared High-Contrast Imaging of HD 114174 B : An Apparent Age Discrepancy in a "Sirius-Like" Binary System
• The Matryoshka Disk: Keck/NIRC2 Discovery of a Solar System-Scale, Radially Segregated Residual Protoplanetary Disk Around HD 141569A
• Polarization aberrations in next-generation giant segmented mirror telescopes (GSMTs) I. Effect on the coronagraphic performance
• HD 117214 debris disk: scattered-light images and constraints on the presence of planets
• New spectro-photometric characterization of the substellar object HR 2562 B using SPHERE
• Direct-imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star, HIP 39017
• Increasing the raw contrast of VLT/SPHERE with the dark-hole technique. II. On-sky wavefront correction and coherent differential imaging
• Fast Coherent Differential Imaging on Ground-Based Telescopes using the Self-Coherent Camera
• A Deep Keck/NIRC2 Search for Thermal Emission from Planetary Companions Orbiting Fomalhaut
• JWST-TST High Contrast: JWST/NIRCam observations of the young giant planet $\beta$ Pic b
• Preparing an unsupervised massive analysis of SPHERE high contrast data with the PACO algorithm
• RSM detection map for direct exoplanet detection in ADI sequences
• Evidence for Variable Accretion onto PDS 70 c and Implications for Protoplanet Detections
• The Near Infrared Imager and Slitless Spectrograph for JWST -- V. Kernel Phase Imaging and Data Analysis
• K-Stacker: Keplerian image recombination for the direct detection of exoplanets
• Laboratory verification of 'Fast & Furious' phase diversity: Towards controlling the low wind effect in the SPHERE instrument
• The far reaches of the beta Pictoris debris disk
• The Mid-Infrared Instrument for the James Webb Space Telescope, X. Operations and Data Reduction
• Two cold belts in the debris disk around the G-type star NZ Lup
• High-sensitivity search for clumps in the Vega Kuiper-belt. New PdBI 1.3mm observations
• Discovery of a White Dwarf Companion to HD 159062
• Iterative Angular Differential Imaging (IADI): An exploration of recovering disk structures in scattered light with an iterative ADI approach
• Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
• Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor. IV. Temporal stability of non-common path aberrations in VLT/SPHERE
• Mapping of shadows cast on a protoplanetary disk by a close binary system
• The TRENDS High-Contrast Imaging Survey. VII. Discovery of a Nearby Sirius-like White Dwarf System (HD 169889)
• External or internal companion exciting the spiral arms in CQ Tau?
• Revealing asymmetrical dust distribution in the inner regions of HD 141569
• Improving the speckle noise attenuation of simultaneous spectral differential imaging with a focal plane holographic diffuser
• Searching for Gas Giant Planets on Solar System Scales: VLT NACO/APP Observations of the Debris Disk Host Stars HD172555 and HD115892
• Predictions of planet detections with near infrared radial velocities in the up-coming SPIRou Legacy Survey-Planet Search
• A Resolved Near-Infrared Image of The Inner Cavity in The GM Aur Transitional Disk
• Data Reduction and Image Reconstruction Techniques for Non-Redundant Masking
• Stochastic Speckle Discrimination with Time-Tagged Photon Lists: Digging Below the Speckle Noise Floor
• Constraining accretion signatures of exoplanets in the TW Hya transitional disk
• Searching for the near infrared counterpart of Proxima c using multi-epoch high contrast SPHERE data at VLT
• Apodization in high-contrast long-slit spectroscopy. II. Concept validation and first on-sky results with VLT/SPHERE
• Measuring the variability of directly imaged exoplanets using vector Apodizing Phase Plates combined with ground-based differential spectrophotometry
• A faint companion around CrA-9: protoplanet or obscured binary?
• A High-contrast Imaging Algorithm: Optimized Image Rotation and Subtraction
• Discovery of an Edge-on Circumstellar Debris Disk Around BD+45${}^{\circ }$598: a Newly Identifed Member of the $\beta$ Pictoris Moving Group
• In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
• Kernel Phase and Coronagraphy with Automatic Differentiation
• The high-albedo, low polarization disk around HD 114082 harbouring a Jupiter-sized transiting planet
• High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph
• Millisecond Exoplanet Imaging, I: Method and Simulation Results
• Magellan AO System $z^{\prime }$, $Y_S$, and $L^{\prime }$ Observations of the Very Wide 650 AU HD 106906 Planetary System
• The beta Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
• Differential aperture photometry and digital coronagraphy with PRAIA
• The Giant Accreting Protoplanet Survey (GAPlanetS): Optimization Techniques for Robust Detections of Protoplanets
• Active minimization of non-common path aberrations in long-exposure imaging of exoplanetary systems
• Half-sibling regression meets exoplanet imaging: PSF modeling and subtraction using a flexible, domain knowledge-driven, causal framework
• Simulation of planet detection with the SPHERE IFS
• Morphology of the gas-rich debris disk around HD 121617 with SPHERE observations in polarized light
• Space-Based Coronagraphic Imaging Polarimetry of the TW Hydrae Disk: Shedding New Light on Self-Shadowing Effects
• Dynamical detection of a companion driving a spiral arm in a protoplanetary disk
• Implementing focal-plane phase masks optimized for real telescope apertures with SLM-based digital adaptive coronagraphy
• A symmetric inner cavity in the HD 141569A transitional disk
• The COBREX archival survey: improved constraints on the occurrence rate of wide-orbit substellar companions. I. A uniform re-analysis of 400 stars from the GPIES survey
• Improved Contrast in Images of Exoplanets using Direct SNR Optimization
• A new white dwarf companion to the $\Delta \mu$ star GJ 3346
• New constraints on the HR 8799 planetary system from mid-infrared direct imaging
• Constraints on the nearby exoplanet $\epsilon$ Ind Ab from deep near/mid-infrared imaging limits
• PDS 70 unveiled by star-hopping: total intensity, polarimetry and mm-imaging modeled in concert
• Stellar Double Coronagraph: a multistage coronagraphic platform at Palomar observatory
• Apocenter pile-up and arcs: a narrow dust ring around HD 129590
• The multiplicity of massive stars in the Scorpius OB1 association through high-contrast imaging
• Trade-offs in high-contrast integral field spectroscopy for exoplanet detection and characterisation: Young gas giants in emission
• Detecting Exoplanets Closer to Stars with Moderate Spectral Resolution Integral-Field Spectroscopy
• The Single-mode Complex Amplitude Refinement (SCAR) coronagraph: I. Concept, theory and design
• Orbital Constraints on the beta Pic Inner Planet Candidate with Keck Adaptive Optics
• New Spatially Resolved Imaging of the SR 21 Transition Disk and Constraints on the Small-Grain Disk Geometry
• Minimization of non common path aberrations at the Palomar telescope using a self-coherent camera
• Near-Infrared Image of the Debris Disk around HD 15115
• Inverse-problem versus principal component analysis methods for angular differential imaging of circumstellar disks. The mustard algorithm
• SCExAO and Keck Direct Imaging Discovery of a Low-Mass Companion Around the Accelerating F5 Star HIP 5319
• The Scorpion Planet Survey: Wide-Orbit Giant Planets Around Young A-type Stars
• Combining high contrast imaging and radial velocities to constrain the planetary architecture of nearby stars
• First resolved observations of a highly asymmetric debris disc around HD 160305 with VLT/SPHERE
• Direct Imaging Discovery of a Young Brown Dwarf Companion to an A2V Star
• VIBES: VIsual Binary Exoplanet survey with SPHERE Upper limits on wide S-planet and S-BD frequencies, triple system discovery, and astrometric confirmation of 20 stellar binaries and three triple systems
• Design, pointing control, and on-sky performance of the mid-infrared vortex coronagraph for the VLT/NEAR experiment
• ALMA imaging of the M-dwarf Fomalhaut C's debris disc
• Improving Planet Detection with Disk Modeling: Keck/NIRC2 Imaging of the HD 34282 Single-armed Protoplanetary Disk
• Constraints on the substellar companions in wide orbits around the Barnard's Star from CanariCam mid-infrared imaging
• Constraining masses and separations of unseen companions to five accelerating nearby stars
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): HD 34700 A unveils an inner ring
• Machine Learning for Exoplanet Detection in High-Contrast Spectroscopy: Revealing Exoplanets by Leveraging Hidden Molecular Signatures in Cross-Correlated Spectra with Convolutional Neural Networks
• High-contrast imaging constraints on gas giant planet formation - The Herbig Ae/Be star opportunity
• Impacts of high-contrast image processing on atmospheric retrievals
• Stroke saturation on a MEMS deformable mirror for woofer-tweeter adaptive optics
• The White Dwarf Binary Pathways Survey III: contamination from hierarchical triples containing a white dwarf
• Imaging the 44 AU Kuiper Belt-analogue debris ring around HD 141569A with GPI polarimetry
• Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring
• Fainter and closer: finding planets by symmetry breaking
• Astrometric Calibration of the Gemini NICI Planet-Finding Campaign
• From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-Wind Binary Wolf-Rayet (WR) 140
• Direct Imaging in the Habitable Zone and the Problem of Orbital Motion
• Differentiating Formation Models with New Dynamical Masses for the PDS 70 Protoplanets
• Multiband imaging of the HD 36546 debris disk: a refined view from SCExAO/CHARIS
• The Possible Astrometric Signature of a Planetary-mass Companion to the Nearby Young Star TW Piscis Austrini (Fomalhaut B): Constraints from Astrometry, Radial Velocities, and Direct Imaging
• SFADI: the Speckle-Free Angular Differential Imaging method
• Detection of H$\alpha$ emission from PZ Tel B using SPHERE/ZIMPOL
• Combining reference-star and angular differential imaging for high-contrast imaging of extended sources
• A dual-mask coronagraph for observing faint companions to binary stars
• Improved Constraints on the Disk Around MWC 349A from the 23-Meter LBTI
• Spectral and angular differential imaging with SPHERE/IFS. Assessing the performance of various PCA-based approaches to PSF subtraction
• A multi-wavelength study of the debris disc around 49 Cet
• ISPY -- NaCo Imaging Survey for Planets around Young stars. Discovery of an M dwarf in the gap between HD 193571 and its debris ring
• Spectral unmixing for exoplanet direct detection in hyperspectral data
• X3: a high-mass Young Stellar Object close to the supermassive black hole Sgr~A*
• Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning reveals the Giant Exoplanet AF Lep b in High-Contrast Imaging Data from 2011
• A low-mass companion desert among intermediate-mass visual binaries: The scaled-up counterpart to the brown dwarf desert
• An inner warp discovered in the disk around HD 110058 using VLT/SPHERE and HST/STIS
• Limits on the presence of planets in systems with debris disks: HD 92945 and HD 107146
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Characterization of the young star T CrA and its circumstellar environment
• Karhunen-Loève Data Imputation in High Contrast Imaging
• NaCo polarimetric observations of Sz 91 transitional disk: a remarkable case of dust filtering
• An imaged 15Mjup companion within a hierarchical quadruple system
• The spectrally modulated self-coherent camera (SM-SCC): Increasing throughput for focal-plane wavefront sensing
• Probing the low-mass end of the companion mass function for O-type stars
• An extended scattered light disk around AT Pyx -- Possible planet formation in a cometary globule
• Giant planets population around B stars from the first part of the BEAST survey
• SCExAO/CHARIS Direct Imaging of A Low-Mass Companion At A Saturn-Like Separation from an Accelerating Young A7 Star
• Near-IR Polarized Scattered Light Imagery of the DoAr 28 Transitional Disk
• An unusually large gaseous transit in a debris disc
• Integral field spectroscopy of L 449-1 -- A test case for spectral differential imaging with SINFONI
• High-Contrast Coronagraphy
• Bayesian analysis of exoplanet and binary orbits
• ISPY - the NaCo Imaging Survey for Planets around Young stars: A young companion candidate embedded in the R CrA cloud
• Keplerian motion of a compact source orbiting the inner disc of PDS 70: a third protoplanet in resonance with b and c?
• Direct Measurement of Extinction in a Planet-Hosting Gap
• Narrow belt of debris around the Sco-Cen star HD 141011
• Indications of M-dwarf Deficits in the Halo and Thick Disk of the Galaxy
• Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of $\alpha$ Cen A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis
• Characterization of debris disks observed with SPHERE
• A deep search for planets in the inner 15 au around Vega
• SPHERE adaptive optics performance for faint targets
• Atmospheric Characterization and Further Orbital Modeling of $\kappa$ And b
• Angular differential kernel phases
• The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results
• A Chromaticity Analysis and PSF Subtraction Techniques for SCExAO/CHARIS data
• BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
• Unveiling wide-orbit companions to K-type stars in Sco-Cen with Gaia EDR3
• High-Contrast Imaging of Intermediate-Mass Giants with Long-Term Radial Velocity Trends
• Adaptive optics in high-contrast imaging
• The polarization-encoded self-coherent camera
• High-contrast, high-angular resolution view of the GJ 367 exoplanet system
• Probing Photon Statistics in Adaptive Optics Images with SCExAO/MEC
• Improved companion mass limits for Sirius A with thermal infrared coronagraphy using a vector-apodizing phase plate and time-domain starlight-subtraction techniques
• Recurrence quantification analysis as a post-processing technique in adaptive optics high-contrast imaging
• Post-processing CHARIS integral field spectrograph data with PyKLIP
• High contrast at small separation -- II. Impact on the dark hole of a realistic optical set-up with two deformable mirrors
• The Bi-O-edge wavefront sensor: How Foucault-knife-edge variants can boost eXtreme Adaptive Optics
• Constraints on Planets in Nearby Young Moving Groups Detectable by High-Contrast Imaging and Gaia Astrometry
• Laboratory comparison of coronagraphic concepts under dynamical seeing and high-order adaptive optics correction
• On-sky closed loop correction of atmospheric dispersion for high-contrast coronagraphy and astrometry
• Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk
• Detection of a low-mass stellar companion to the accelerating A2IV star HR 1645
• Exoplanet Atmosphere Measurements from Direct Imaging
• High-contrast spectroscopy with the new VLT/ERIS instrument: Molecular maps and radial velocity of the gas giant AF Lep b
• SEEDS direct imaging of the RV-detected companion to V450 Andromedae, and characterization of the system
• MagAO Imaging of Long-period Objects (MILO). II. A Puzzling White Dwarf around the Sun-like Star HD 11112
• PACOME: Optimal multi-epoch combination of direct imaging observations for joint exoplanet detection and orbit estimation
• LBT search for companions and sub-structures in the (pre)transitional disk of AB Aurigae
• Orbital Modeling of HII 1348B: An Eccentric Young Substellar Companion in the Pleiades
• ALMA and NACO observations towards the young exoring transit system J1407 (V1400 Cen)
• Extreme Contrast Ratio Imaging of Sirius with a Charge Injection Device
• Speckle Space-Time Covariance in High-Contrast Imaging
• Investigating the nature of the extended structure around the Herbig star RCrA using integral field and high-resolution spectroscopy
• High contrast imaging with Fizeau interferometry: The case of Altair
• The First High-Contrast Images of X-Ray Binaries: Detection of Candidate Companions in the $\gamma$ Cas Analog RX J1744.7$-$2713
• Monitoring inner regions in the RY Tau jet
• Protoplanetary disk insights from the first ERIS/APP survey at 4 μm
• Dynamical Masses and Ages of Sirius-like Systems
• Auto-RSM: an automated parameter-selection algorithm for the RSM map exoplanet detection algorithm
• NA-SODINN: a deep learning algorithm for exoplanet image detection based on residual noise regimes
• Astrometric and photometric characterization of $\eta$ Tel B combining two decades of observations
• ISPY -- NaCo Imaging Survey for Planets around Young stars. CenteR: the impact of centering and frame selection
• VLT/SPHERE survey for exoplanets around young, early-type stars including systems with multi-belt architectures
• Direct Imaging Explorations for Companions around Mid-Late M Stars from the Subaru/IRD Strategic Program
• A triple star in disarray -- Multi-epoch observations of T Tauri with VLT-SPHERE and LBT-LUCI
• Fast-Cadence High-Contrast Imaging with Information Field Theory
• Reduced Order Estimation of the Speckle Electric Field History for Space-Based Coronagraphs
• Planetary system architectures with low-mass inner planets: Direct imaging exploration of mature systems beyond 1 au
• K2 Targets Observed with SPHERE/VLT: An M4-7 Dwarf Companion Resolved around EPIC 206011496
• Companion Mass Limits for 17 Binary Systems Obtained with Binary Differential Imaging and MagAO/Clio
• A multi-technique detection of an eccentric giant planet around accelerating star HD 57625
• SAFARI I: A SPHERE discovery of a super metal-rich M dwarf companion to the star HD 86006
• Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527
• HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
• Peering through the veil: Investigating protoplanetary disk outer edges using backside visibility
• A Possible Converter to Denoise the Images of Exoplanet Candidates through Machine Learning Techniques
• Polarimetric differential imaging with VLT/NACO. A comprehensive PDI pipeline for NACO data (PIPPIN)
• SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515
• First Principle Simulator of a Stochastically Varying Image Plane for Photon-Counting High Contrast Applications
• A second planetesimal collision in the Fomalhaut system
• Planet Search with the Keck/NIRC2 Vortex Coronagraph in Ms-band for Vega
• Spectral cube extraction for the VLT/SPHERE IFS: Open-source pipeline with full forward modeling and improved sensitivity
• {\sc precision}: A fast python pipeline for high-contrast imaging -- application to SPHERE observations of the red supergiant VX Sagitariae
• Searching for the HR 8799 Debris Disk with HST/STIS
• An Imaging Search for Post-Main-Sequence Planets of Sirius B
• The first scattered light images of HD 112810, a faint debris disk in the Sco-Cen association
• Redundant apodization for direct imaging of exoplanets 2: Application to island effects
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light
• From Exoplanets to Quasars: Detection of Potential Damped Lyman Alpha Absorbing Galaxies Using Angular Differential Imaging
• Signpost of Multiple Planets in Debris Disks
• Three new late-type stellar companions to very dusty WISE debris disks identified with VLT/SPHERE imaging
• Machine learning for exoplanet detection in high-contrast spectroscopy Combining cross correlation maps and deep learning on medium-resolution integral-field spectra
• Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
• Exoplanets in reflected starlight with dual-field interferometry: A case for shorter wavelengths and a fifth Unit Telescope at VLTI/Paranal
• OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B: A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration
• RHAPSODIE: Reconstruction of High-contrAst Polarized SOurces and Deconvolution for cIrcumstellar Environments
• HD 165054: an astrometric calibration field for high-contrast imagers in Baade's Window
• Direct Imaging Discovery of Giant Exoplanet $\beta$ Pictoris d: A Decade-Long Game of Hide-and-Seek
• Adaptive pupil masking for quasi-static speckle suppression
• Revealing the accelerating wind in the inner region of the colliding-wind binary WR 112
• An Alternating Minimization Algorithm with Trajectory for Direct Exoplanet Detection -- The AMAT Algorithm
• The Mysterious Lives Of Speckles. I. Residual atmospheric speckle lifetimes in ground-based coronagraphs
• High-contrast Imaging around a 2 Myr-old CI Tau with a Close-in Gas Giant
• Improving the RSM map exoplanet detection algorithm: PSF forward modelling and optimal selection of PSF subtraction techniques
• Ground-Based Mid-IR Direct Imaging: The Origin of the Thermal Background on the Keck II Telescope and Correcting Instrumental Systematics
• Optimising reference library selection for reference-star differential imaging of discs with SPHERE/IRDIS
• Searching for Embedded Protoplanets with the Keck/NIRC2 Vortex Coronagraph: Confirmation of a Core-accretion Planet in the Narrow Gap of the Elias 2-24 Disk
• Coronagraphic Data Post-processing Using Projections on Instrumental Modes
• The GAPS Programme at TNG LXVIII. Characterization of the outer substellar companion around HD 72659 with a multi-technique approach
• IRDIS, the dual-band imager camera of SPHERE: testing the performances in laboratory
• Charge-Injection Device Imaging of Sirius with Contrast Ratios Greater than 1:26 Million
• Performances tests on the SPHERE-IFS
• The HOSTS Survey: Suspected variable dust emission and constraints on companions around θ Boo
• SCExAO/CHARIS Multi-Wavelength, High-Contrast Imaging of the BD+45${}^{\circ }$598 Debris Disk
• L-band Integral Field Spectroscopy of the HR 8799 Planetary System
• Search for cool extrasolar giant planets combining coronagraphy, spectral and angular differential imaging
• CoronaGraph Instrument Reference stars for Exoplanets (CorGI-REx) I. Preliminary Vetting and Implications for the Roman Coronagraph and Habitable Worlds Observatory
• Precision speckle pattern reconstruction for high contrast imaging
• Photometric and Astrometric Information for Sources around HD~163296 Revealed by JWST/NIRCam Coronagraphy
• JWST-TST High Contrast: First Direct Spectroscopy of GJ 504 b reveals Clouds and Possible Metal Enrichment
• A spatially-resolved large cavity of the J0337 protoplanetary disk in Perseus
• Focal plane wavefront control with model-based reinforcement learning
• Tri-coupler geometries for achromatic nulling interferometry in the near-infrared
• Constraining the mass of the planet(s) sculpting a disk cavity. The intriguing case of 2MASS J16042165-2130284
• A spectral differential approach to characterizing low-mass companions to late-type stars
• A planetary-mass candidate imaged in the Young Suns Exoplanet Survey