A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging

Abstract

Direct imaging of exoplanets is limited by bright quasi-static speckles in the point spread function (PSF) of the central star. This limitation can be reduced by subtraction of reference PSF images. We have developed an algorithm to construct an optimized reference PSF image from a set of reference images. This image is built as a linear combination of the reference images available and the coefficients of the combination are optimized inside multiple subsections of the image independently to minimize the residual noise within each subsection. The algorithm developed can be used with many high-contrast imaging observing strategies relying on PSF subtraction, such as angular differential imaging (ADI), roll subtraction, spectral differential imaging, reference star observations, etc. The performance of the algorithm is demonstrated for ADI data. It is shown that for this type of data the new algorithm provides a gain in sensitivity by up to a factor 3 at small separation over the algorithm used in Marois et al. (2006).

7 pages, 11 figures, to appear in May 10, 2007 issue of ApJ

Cited by in corpus (369)

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• A Simple Depth of Search Metric for Exoplanet Imaging Surveys
• PeX 1. Multi-spectral expansion of residual speckles for planet detection
• Probing Photon Statistics in Adaptive Optics Images with SCExAO/MEC
• Applying a temporal systematics model to vector Apodizing Phase Plate coronagraphic data: TRAP4vAPP
• High contrast at small separation -- II. Impact on the dark hole of a realistic optical set-up with two deformable mirrors
• Exoplanet Atmosphere Measurements from Direct Imaging
• Far-infrared emission of massive stars
• Recurrence quantification analysis as a post-processing technique in adaptive optics high-contrast imaging
• Constraints on Planets in Nearby Young Moving Groups Detectable by High-Contrast Imaging and Gaia Astrometry
• Speckle Space-Time Covariance in High-Contrast Imaging
• NA-SODINN: a deep learning algorithm for exoplanet image detection based on residual noise regimes
• ALMA and Keck analysis of Fomalhaut field sources: JWST's Great Dust Cloud is a background object
• Extreme Contrast Ratio Imaging of Sirius with a Charge Injection Device
• Auto-RSM: an automated parameter-selection algorithm for the RSM map exoplanet detection algorithm
• LBT search for companions and sub-structures in the (pre)transitional disk of AB Aurigae
• High contrast imaging with Fizeau interferometry: The case of Altair
• Tiny Grains Shining Bright in the Gaps of Herbig Ae Transitional Discs
• Discovering planets with PLATO: Comparison of algorithms for stellar activity filtering
• VLT/SPHERE survey for exoplanets around young, early-type stars including systems with multi-belt architectures
• ISPY -- NaCo Imaging Survey for Planets around Young stars. CenteR: the impact of centering and frame selection
• An HST/STIS View of Protoplanetary Disks in Upper Scorpius: Observations of Three Young M-Stars
• Fast-Cadence High-Contrast Imaging with Information Field Theory
• A Substellar Companion to Pleiades HII 3441
• 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
• Companion Mass Limits for 17 Binary Systems Obtained with Binary Differential Imaging and MagAO/Clio
• {\sc precision}: A fast python pipeline for high-contrast imaging -- application to SPHERE observations of the red supergiant VX Sagitariae
• A second planetesimal collision in the Fomalhaut system
• Searching for the HR 8799 Debris Disk with HST/STIS
• 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
• From Exoplanets to Quasars: Detection of Potential Damped Lyman Alpha Absorbing Galaxies Using Angular Differential Imaging
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light
• OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B: A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration
• Improving the RSM map exoplanet detection algorithm: PSF forward modelling and optimal selection of PSF subtraction techniques
• Characterization of stellar companion from high-contrast long-slit spectroscopy data: The EXtraction Of SPEctrum of COmpanion (EXOSPECO) algorithm
• The Mysterious Lives Of Speckles. I. Residual atmospheric speckle lifetimes in ground-based coronagraphs
• An Alternating Minimization Algorithm with Trajectory for Direct Exoplanet Detection -- The AMAT Algorithm
• Adaptive pupil masking for quasi-static speckle suppression
• A Mid-Infrared Search for Substellar Companions of Nearby Planet-Host Stars
• StraKLIP: A novel pipeline for detection and characterization of close-in faint companions through Karhunen-Loêve Image Processing algorithm
• Precision speckle pattern reconstruction for high contrast imaging
• A spectral differential approach to characterizing low-mass companions to late-type stars
• An Adaptive Optics Census of Companions to Northern Stars Within 25 pc with Robo-AO
• SCExAO/CHARIS Multi-Wavelength, High-Contrast Imaging of the BD+45${}^{\circ }$598 Debris Disk
• Hubble Space Telescope Snapshot Survey for Resolved Companions of Galactic Cepheids: Final Results
• Coronagraphic Data Post-processing Using Projections on Instrumental Modes
• Optimising reference library selection for reference-star differential imaging of discs with SPHERE/IRDIS
• Constraining the mass of the planet(s) sculpting a disk cavity. The intriguing case of 2MASS J16042165-2130284