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Very high contrast integral field spectroscopy of AB Doradus C: 9-mag contrast at 0.2 arcsec without a coronagraph using spectral deconvolution

Authors
  • Niranjan, Thatte
  • Roberto, Abuter
  • Matthias, Tecza
  • Eric Nielsen
  • Fraser J, Clarke
  • Laird M, Close
Type
Published Article
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press
Publication Date
Jul 10, 2007
Volume
378
Issue
4
Pages
1229–1236
Source
SETI Institute
License
Unknown

Abstract

We present an extension of the spectral deconvolution (SD) method to achieve very high contrast at small inner working radii. We apply the method to the specific case of ground-based adaptive optics fed integral field spectroscopy (without a coronagraph). Utilizing the wavelength dependence of the Airy and speckle patterns, we make an accurate estimate of the point spread function that can be scaled and subtracted from the data cube. The residual noise in the resulting spectra is very close to the photon noise from the ...

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