Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-21
Mon.Not.Roy.Astron.Soc.378:1229-1236,2007
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures, accepted for publication in MNRAS. This is a joint submission with astro-ph/0703564 by L. Close et al
Scientific paper
10.1111/j.1365-2966.2007.11717.x
We present an extension of the spectral deconvolution method (Sparks & Ford 2002) 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). Utilising the wavelength dependence of the Airy and speckle patterns, we make an accurate estimate of the PSF 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 starlight halo. We utilise the technique to extract a very high SNR H & K band spectrum of AB Dor C, the low mass companion to AB Dor A. By effectively eliminating all contamination from AB Dor A, the extracted spectrum retains both continuum and spectral features. The achieved 1 sigma contrast is 9 mag at 0.2", 11 mag at 0.5", in 20 mins exposure time, at an effective spectral bandwidth of 5.5 nm, proving that the method is applicable even in low Strehl regimes. The spectral deconvolution method clearly demonstrates the efficacy of image slicer based IFUs in achieving very high contrast imaging spectroscopy at small angular separations, validating their use as high contrast spectrographs/imagers for extreme adaptive optics systems.
Abuter Roberto
Clarke Fraser J.
Close Laird M.
Nielsen Eric L.
Tecza Matthias
No associations
LandOfFree
Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-381940