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We propose a complete framework for the detection, astrometry, and photometryof faint companions from a sequence of adaptive optics corrected shortexposures. The algorithms exploit the difference in statistics between theon-axis and off-axis intensity. Using moderate-Strehl ratio data obtained withthe natural guide star adaptive optics system on the Lick Observatory's 3-mShane Telescope, we compare these methods to the standard approach of PSFfitting. We give detection limits for the Lick system, as well as a first guideto expected accuracy of differential photometry and astrometry with the newtechniques. The proposed approach to detection offers a new way of determiningdynamic range, while the new algorithms for differential photometry andastrometry yield accurate results for very faint and close-in companions wherePSF fitting fails. All three proposed algorithms are self-calibrating, i.e.they do not require observation of a calibration star thus improving theobserving efficiency.

Reference-less detection, astrometry, and photometry of faint companions with adaptive optics