An optimal point spread function subtraction algorithm for high-contrast imaging: a demonstration with angular differential imaging

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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 optimal reference PSF image from an arbitrary set of reference images. This image is built as a linear combination of all available images and is optimized independently inside multiple subsections of the image to ensure that the absolute minimum residual noise is achieved within each subsection. The algorithm developed is completely general and can be used with many high contrast imaging ... continued below

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PDF-file: 27 pages; size: 0.6 Mbytes

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Lafreniere, D; Marois, C; Doyon, R; Artigau, E & Nadeau, D September 19, 2006.

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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 optimal reference PSF image from an arbitrary set of reference images. This image is built as a linear combination of all available images and is optimized independently inside multiple subsections of the image to ensure that the absolute minimum residual noise is achieved within each subsection. The algorithm developed is completely general and can be used with many high contrast imaging observing strategies, 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 22 to a factor 3 at small separation over the algorithm previously used.

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PDF-file: 27 pages; size: 0.6 Mbytes

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  • Journal Name: The Astrophysical Journal, vol. 660, no. 1, May 1, 2007, pp. 770-780; Journal Volume: 660; Journal Issue: 1

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  • Report No.: UCRL-JRNL-224650
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936973
  • Archival Resource Key: ark:/67531/metadc898026

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 19, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 8:50 p.m.

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Lafreniere, D; Marois, C; Doyon, R; Artigau, E & Nadeau, D. An optimal point spread function subtraction algorithm for high-contrast imaging: a demonstration with angular differential imaging, article, September 19, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898026/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.