# Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages

Source: [Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages](<https://www.sota2.com/research/paper/68fa306c1e209131ce875411>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T18:11:59.812Z

Authors: Remi Soummer, Laurent Pueyo, James Larkin

Published: 2012-07-17T20:00:29.000Z

## Abstract

We describe a new method to achieve point spread function (PSF) subtractions for high- contrast imaging using Principal Component Analysis (PCA) that is applicable to both point sources or extended objects (disks). Assuming a library of reference PSFs, a Karhunen-Lo\`eve transform of theses references is used to create an orthogonal basis of eigenimages, on which the science target is projected. For detection this approach provides comparable suppression to the Locally Optimized Combination of Images (LOCI) algorithm, albeit with increased robustness to the algorithm parameters and speed enhancement. For characterization of detected sources the method enables forward modeling of astrophysical sources. This alleviates the biases in the astrometry and photometry of discovered faint sources, which are usually associated with LOCI- based PSF subtractions schemes. We illustrate the algorithm performance using archival Hubble Space Telescope (HST) images, but the approach may also be considered for ground-based data acquired with Angular Differential Imaging (ADI) or integral-field spectrographs (IFS).

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

- [Exoplanet Detection on HD159911 54°](<https://www.sota2.com/research/sota/exoplanet-detection-on-hd159911-54.md>): Exoplanet Detection; HD159911 54°; AUC: 69.4.

- [Exoplanet Detection on HD216803 23°](<https://www.sota2.com/research/sota/exoplanet-detection-on-hd216803-23.md>): Exoplanet Detection; HD216803 23°; AUC: 0.696.

- [Exoplanet Detection on HD206860 11°](<https://www.sota2.com/research/sota/exoplanet-detection-on-hd206860-11.md>): Exoplanet Detection; HD206860 11°; AUC: 55.2.

- [Exoplanet Detection on HD188228 6°](<https://www.sota2.com/research/sota/exoplanet-detection-on-hd188228-6.md>): Exoplanet Detection; HD188228 6°; AUC: 39.8.

- [Exoplanet Detection on VLT/SPHERE Synthetic Exoplanet Injections Average](<https://www.sota2.com/research/sota/exoplanet-detection-on-vlt-sphere-synthetic-exoplanet-injections-average.md>): Exoplanet Detection; VLT/SPHERE Synthetic Exoplanet Injections Average; Average AUC: 0.515.

- [Exoplanet Detection on HD102647 2°](<https://www.sota2.com/research/sota/exoplanet-detection-on-hd102647-2.md>): Exoplanet Detection; HD102647 2°; AUC: 23.6.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1207.4197>)

[PDF](<https://arxiv.org/pdf/1207.4197.pdf>)