Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-02
Astronomy and Astrophysics
Astrophysics
12 pages, 10 figures, to appear in Astronomy with High Contrast Imaging, EAS Publications Series
Scientific paper
We present the first results obtained at CFHT with the TRIDENT infrared camera, dedicated to the detection of faint companions close to bright nearby stars. The camera's main feature is the acquisition of three simultaneous images in three wavelengths (simultaneous differential imaging) across the methane absorption bandhead at 1.6 micron, that enables a precise subtraction of the primary star PSF while keeping the companion signal. The main limitation is non-common path aberrations between the three optical paths that slightly decorrelate the PSFs. Two types of PSF calibrations are combined with the differential simultaneous imaging technique to further attenuate the PSF: reference star subtraction and instrument rotation to smooth aberrations. It is shown that a faint companion with a DeltaH of 10 magnitudes would be detected at 0.5 arcsec from the primary.
Doyon Rene
Marois Christian
Nadeau Daniel
Racine Rene
Walker Gordon A. H.
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