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While several observational investigations have revealed the presence ofmagnetic fields in the circumstellar envelopes, jets and outflows ofpost-Asymptotic Giant Branch stars (PAGBs) and planetary nebulae (PNe), nonehas clearly demonstrated their presence at the stellar surface. The lack ofinformation on the strength of the surface magnetic fields prevents us fromperforming any thorough assessment of their dynamic capability (i.e. materialmixing, envelope shaping, etc). We present new high resolutionspectropolarimetric (Stokes V ) observations of a sample of PAGB stars,realised with the instruments ESPaDOnS and Narval, where we searched for thepresence of photospheric magnetic fields. Out of the seven targets investigatedthe RV Tauri stars U Mon and R Sct display a clear Zeeman signature and returna definite detection after performing a least squares deconvolution (LSD)analysis. The remaining five PAGBs show no significant detection. We derivedlongitudinal magnetic fields of 10.2 +/- 1.7 G for U Mon and 0.6 +/- 0.6 G forR Sct. In both cases the Stokes profiles point towards an interaction of themagnetic field with the atmosphere dynamics. This first discovery of weakmagnetic fields (i.e. ~10 gauss level) at the stellar surface of PAGB starsopens the door to a better understanding of magnetism in evolved stars.

First detection of surface magnetic fields in Post-AGB stars : the cases of U Monocerotis and R Scuti