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- W4313484248 abstract "Tidal disruption events (TDEs) occur when a star orbiting a massive black hole is sufficiently close to be tidally ripped apart by the black hole. AT 2022cmc is the first relativistic TDE that was observed (and discovered) as an optically bright and fast transient, showing signatures of non-thermal radiation induced by a jet which is oriented towards the Earth. In this work, we present optical linear and circular polarization measurements, observed with VLT/FORS2 in the $R$-band (which corresponds to the blue/UV part of the spectrum in rest frame), $sim$ 7.2 and $sim$ 12.2 rest-frame days after the first detection, respectively, when the light curve of the transient had settled in a bright blue plateau. Both linear and circular polarization are consistent 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 obtained for a relativistic TDE and the first circular polarimetry for such a transient. The non detection of the linear and circular polarization is consistent with the scenario of AT 2022cmc being a TDE where the thermal component (disk+outflows) is viewed pole-on, assuming an axially symmetric geometry. The presence and effect of a jet and/or external shocks are, however, difficult to disentangle." @default.
- W4313484248 created "2023-01-06" @default.
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- W4313484248 date "2023-01-01" @default.
- W4313484248 modified "2023-10-18" @default.
- W4313484248 title "Linear and circular polarimetry of the optically bright relativistic Tidal Disruption Event AT 2022cmc" @default.
- W4313484248 doi "https://doi.org/10.48550/arxiv.2301.00499" @default.
- W4313484248 hasPublicationYear "2023" @default.
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