Searching for Faint Companions with the TRIDENT Differential   Simultaneous Imaging Camera
  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. Its 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. Gl229 and 55Cnc observations are presented to demonstrate TRIDENT subtraction performances. It is shown that a faint companion with a DeltaH of 10 magnitudes would be detected at 0.5 arcsec from the primary. 
C. Marois (1), D. Nadeau (1), R. Doyon (1), R. Racine (1) and G. A. H.   Walker (2) ((1) Universite de Montreal, (2) Univers...