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Fomalhaut is a bright star 7.7 parsecs (25 light years) from Earth thatharbors a belt of cold dust with a structure consistent with gravitationalsculpting by an orbiting planet. Here, we present optical observations of anexoplanet candidate, Fomalhaut b. In the plane of the belt, Fomalhaut b liesapproximately 119 astronomical units (AU) from the star and 18 AU from thebelt, matching predictions. We detect counterclockwise orbital motion usingHubble Space Telescope observations separated by 1.73 years. Dynamical modelsof the interaction between the planet and the belt indicate that the planet'smass is at most three times that of Jupiter for the belt to avoid gravitationaldisruption. The flux detected at 800 nm is also consistent with that of aplanet with mass no greater than a few times that of Jupiter. The brightness at600 nm and the lack of detection at longer wavelengths suggest that thedetected flux may include starlight reflected off a circumplanetary disk, withdimension comparable to the orbits of the Galilean satellites. We also observedvariability of unknown origin at 600 nm.

Optical Images of an Exosolar Planet 25 Light Years from Earth