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The apparent detection of an exoplanet orbiting Fomalhaut was announced in2008. However, subsequent observations of Fomalhaut b raised questions aboutits status: Unlike other exoplanets, it is bright in the optical andnondetected in the infrared, and its orbit appears to cross the debris ringaround the star without the expected gravitational perturbations. We revisitpreviously published data and analyze additional Hubble Space Telescope (HST)data, finding that the source is likely on a radial trajectory and has fadedand become extended. Dynamical and collisional modeling of a recently produceddust cloud yields results consistent with the observations. Fomalhaut b appearsto be a directly imaged catastrophic collision between two large planetesimalsin an extrasolar planetary system. Similar events should be very rare inquiescent planetary systems of the age of Fomalhaut, suggesting that we arepossibly witnessing the effects of gravitational stirring due to the orbitalevolution of hypothetical planet(s) around the star.

New HST data and modeling reveal a massive planetesimal collision around Fomalhaut