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We show that the exoplanet-host star iota Horologii, alias HD17051, whichbelongs to the so-called Hyades stream, was formed within the primordial Hyadesstellar cluster and has evaporated towards its present location, 40 pc away.This result has been obtained unambiguously by studying the acousticoscillations of this star, using the HARPS spectrometer in La Silla Observatory(ESO, Chili). Besides the fact that $\iota$ Hor belongs to the Hyades stream,we give evidence that it has the same metallicity, helium abundance, and age asthe other stars of the Hyades cluster. They were formed together, at the sametime, in the same primordial cloud. This result has strong implications fortheories of stellar formation. It also indicates that the observedovermetallicity of this exoplanet-host star, about twice that of the Sun, isoriginal and not caused by planet accretion during the formation of theplanetary system.

The exoplanet-host star iota Horologii: an evaporated member of the primordial Hyades cluster