PeX 1. Multi-spectral expansion of residual speckles for planet detection

Abstract

The detection of exoplanets in coronographic images is severely limited by residual starlight speckles. Dedicated post-processing can drastically reduce this "stellar leakage" and thereby increase the faintness of detectable exoplanets. Based on a multi-spectral series expansion of the diffraction pattern, we derive a multi-mode model of the residuals which can be exploited to estimate and thus remove the residual speckles in multi-spectral coronographic images. Compared to other multi-spectral processing methods, our model is physically grounded and is suitable for use in an (optimal) inverse approach. We demonstrate the ability of our model to correctly estimate the speckles in simulated data and demonstrate that very high contrasts can be achieved. We further apply our method to removing speckles from a real data cube obtained with the SPHERE IFS instrument.

arXiv commentaccepted for publication in MNRAS on 25th of August 2017, 17 pages, 15 figures

References in corpus (22)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• The Gemini Planet Imager: First Light
• A probable giant planet imaged in the Beta Pictoris disk
• A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging
• PynPoint: An Image Processing Package for Finding Exoplanets
• Discovery of a probable 4-5 Jupiter-mass exoplanet to HD 95086 by direct-imaging
• Two Wide Planetary-Mass Companions to Solar-Type Stars in Upper Scorpius
• The Directly Imaged Planet around the Young Solar Analog 1RXS J160929.1-210524: Confirmation of Common Proper Motion, Temperature and Mass
• The Structure of High Strehl Ratio Point-Spread Functions
• Temporal Evolution of Coronagraphic Dynamic Range, and Constraints on Companions to Vega
• High-contrast imaging of Sirius~A with VLT/SPHERE: Looking for giant planets down to one astronomical unit
• TRIDENT: an Infrared Differential Imaging Camera Optimized for the Detection of Methanated Substellar Companions
• Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolution
• Direct Imaging Discovery of a Jovian Exoplanet Within a Triple Star System
• Application of a damped Locally Optimized Combination of Images method to the spectral characterization of faint companions using an Integral Field Spectrograph
• GPI PSF subtraction with TLOCI: the next evolution in exoplanet/disk high-contrast imaging
• Speckle Suppression with the Project 1640 Integral Field Spectrograph
• Optimized Principal Component Analysis on Coronagraphic Images of the Fomalhaut System
• Early ComeOn+ Adaptive Optics Observation of GQ Lup and its Substellar Companion
• A diamond AGPM coronagraph for VISIR
• A new sub-stellar companion around the young star HD 284149

Cited by in corpus (3)

• Astrometric and photometric accuracies in high contrast imaging: The SPHERE speckle calibration tool (SpeCal)
• Fast Coherent Differential Imaging on Ground-Based Telescopes using the Self-Coherent Camera
• Characterization of stellar companion from high-contrast long-slit spectroscopy data: The EXtraction Of SPEctrum of COmpanion (EXOSPECO) algorithm