Abstract
We report on the rst observation run with the Achromatic Interfero Coronagraph (AIC) developed at Observatoire de la C^ ote d'Azur, France. Observations took place during Fall 97 at Observatoire de Haute Provence, France, with the 1.52 m telescope equipped at that time with adaptive optics. The Achromatic Interfero Coronagraph (AIC) is an imaging device providing the extinction of a star so as to detect and to image faint features of its close environment. Extinction results from a destructive interference process. Morphological features located as close to the star as the rst angular Airy ring can be detected, thus breaking a limitation of the classical Lyot coronagraphs. The working spectral band was K. Observation results demonstrate the validity of the AIC approach with ground-based telescopes and illustrates close-sensing capabilities. After a short reminding of the principle of AIC, conditions of observations are re- ported and rst results are discussed. Finally, limitations are evaluated and expected results are compared with eective performance.
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