086540

The recent discovery of Pi Men c comma a super-Earth transiting an outstandingly bright nearby star openParV = 5.67 18 pcclosePar comma presents an unrivalled opportunity to study the atmosphere of a small planet just above the ..radius-period valley. While the expected transit signature of the atmosphere in the optical-infrared is very small comma the high-energy environment of the planet is thought to be favourable for large transit absorption features in the far- ultraviolet due to an escaping comma extended upper atmosphere. Using simultaneous XMM-Newton and HST observations comma we propose to perform both a full reconstruction of the differential emission measure in order to characterise the high-energy irradiation impingent on the planet comma and a sensitive search for evaporation signals due to these photons. In addit