• Corpus ID: 7247056

A NEW ALGORITHM FOR POINT SPREAD FUNCTION SUBTRACTION IN HIGH-CONTRAST IMAGING: A DEMONSTRATION WITH ANGULAR DIFFERENTIAL IMAGING

@inproceedings{Arois2007ANA,
  title={A NEW ALGORITHM FOR POINT SPREAD FUNCTION SUBTRACTION IN HIGH-CONTRAST IMAGING: A DEMONSTRATION WITH ANGULAR DIFFERENTIAL IMAGING},
  author={C Hristian M Arois and R Oy{\'o}n and D Aniel N Adeau},
  year={2007}
}

• C. H. M. Arois, R. Oyón, D. A. N. Adeau
• Published 2007
• Physics, Geology

Direct imaging of exoplanets is limited by bright quasi-sta tic speckles in the point spread function (PSF) of the central star. This limitation can be reduced by subtract ion of reference PSF images. We have developed an algorithm to construct an optimized reference PSF image f rom a set of reference images. This image is built as a linear combination of the reference images availa ble nd the coefficients of the combination are optimized inside multiple subsections of the image indepen dently to minimize the residual noise within each subsection. The algorithm developed can be used with many hi gh-contrast imaging observing strategies relying on PSF subtraction, such as angular differential imaging (A DI), roll subtraction, spectral differential imaging, reference star observations, etc. The performance of the al gorithm is demonstrated for ADI data. It is shown that for this type of data the new algorithm provides a gain in se sitivity by up to a factor 3 at small separation over the algorithm used in Marois et al. (2006). Subject headings: Instrumentation: adaptive optics — planetary systems — sta rs: imaging — techniques: image processing — techniques: high angular resolution