Physically constrained causal noise models for high-contrast imaging of exoplanets

Abstract

The detection of exoplanets in high-contrast imaging (HCI) data hinges on post-processing methods to remove spurious light from the host star. So far, existing methods for this task hardly utilize any of the available domain knowledge about the problem explicitly. We propose a new approach to HCI post-processing based on a modified half-sibling regression scheme, and show how we use this framework to combine machine learning with existing scientific domain knowledge. On three real data sets, we demonstrate that the resulting system performs clearly better (both visually and in terms of the SNR) than one of the currently leading algorithms. If further studies can confirm these results, our method could have the potential to allow significant discoveries of exoplanets both in new and archival data.

Accepted at the "Machine Learning and the Physical Sciences" workshop at NeurIPS 2020. 9 pages, 6 figures

References in corpus (14)

• Scikit-learn: Machine Learning in Python
• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• Fundamental limitations of high contrast imaging set by small sample statistics
• The Structure of High Strehl Ratio Point-Spread Functions
• Improving and Assessing Planet Sensitivity of the GPI Exoplanet Survey with a Forward Model Matched Filter
• Searching for companions down to 2 AU from beta Pictoris using the L'-band AGPM coronagraph on VLT/NACO
• Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
• Low-rank plus sparse decomposition for exoplanet detection in direct-imaging ADI sequences. The LLSG algorithm
• TRAP: A temporal systematics model for improved direct detection of exoplanets at small angular separations
• A pixel-level model for event discovery in time-domain imaging
• ERIS: revitalising an adaptive optics instrument for the VLT
• Wavelet based speckle suppression for exoplanet imaging - Application of a de-noising technique in the time domain

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