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The recent discovery of an earth-like planet around Proxima Centauri hasdrawn much attention to this star and its environment. We performed a series ofobservations of Proxima Centauri using SPHERE, the planet finder instrumentinstalled at the ESO Very Large Telescope UT3, using its near infrared modules,IRDIS and IFS. No planet was directly detected but we set upper limits on themass up to 7 au exploiting the AMES-COND models. Our IFS observations revealthat no planet more massive than ~6-7 M Jup can be present within 1 au. Thedual band imaging camera IRDIS also enables us to probe larger separations thanthe other techniques like the radial velocity or astrometry. We obtained masslimits of the order of 4 M Jup at separations of 2 au or larger representingthe most stringent mass limits at separations larger than 5 au available at themoment. We also did an attempt to estimate the radius of possible planetsaround Proxima using the reflected light. Since the residual noise for thisobservations are dominated by photon noise and thermal background, longerexposures in good observing conditions could further improve the achievablecontrast limit.

Upper limits for Mass and Radius of objects around Proxima Cen from SPHERE/VLT