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Tidal disruption events (TDEs) occur when a star orbiting a massive blackhole is sufficiently close to be tidally ripped apart by the black hole. AT2022cmc is the first relativistic TDE that was observed (and discovered) as anoptically bright and fast transient, showing signatures of non-thermalradiation induced by a jet which is oriented towards the Earth. In this work,we present optical linear and circular polarization measurements, observed withVLT/FORS2 in the $R$-band (which corresponds to the blue/UV part of thespectrum in rest frame), $\sim$ 7.2 and $\sim$ 12.2 rest-frame days after thefirst detection, respectively, when the light curve of the transient hadsettled in a bright blue plateau. Both linear and circular polarization areconsistent with zero, $p_{lin}$ = 0.14 $\pm$ 0.73 % and $p_{cir}$ = $-$0.30$\pm$ 0.53 %. This is the highest S/N linear polarization measurement obtainedfor a relativistic TDE and the first circular polarimetry for such a transient.The non detection of the linear and circular polarization is consistent withthe scenario of AT 2022cmc being a TDE where the thermal component(disk+outflows) is viewed pole-on, assuming an axially symmetric geometry. Thepresence and effect of a jet and/or external shocks are, however, difficult todisentangle.

Linear and circular polarimetry of the optically bright relativistic Tidal Disruption Event AT 2022cmc