Polarimetry of relativistic tidal disruption event Swift J2058+0516

Abstract

A small fraction of candidate tidal disruption events (TDEs) show evidence of powerful relativistic jets, which are particularly pronounced at radio wavelengths, and likely contribute non-thermal emission at a wide range of wavelengths. A non-thermal emission component can be diagnosed using linear polarimetry, even when the total received light is dominated by emission from an accretion disk or disk outflow. In this paper we present Very Large Telescope (VLT) measurements of the linear polarisation of the optical light of jetted TDE Swift J2058+0516. This is the second jetted TDE studied in this manner, after Swift J1644+57. We find evidence of non-zero optical linear polarisation, P_V ~ 8%, a level very similar to the near-infrared polarimetry of Swift J1644+57. These detections provide an independent test of the emission mechanisms of the multiwavelength emission of jetted tidal disruption events.

7 pages, 4 figures, MNRAS

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• A candidate relativistic tidal disruption event at 340 Mpc
• Modeling continuum polarization levels of tidal disruption events based on the collision-induced outflow mode
• Simulated optical light curves of super-Eddington tidal disruption events with ZEBRA flows
• Linear and circular polarimetry of the optically bright relativistic Tidal Disruption Event AT 2022cmc
• Optical polarization of stellar-fed active and quiescent supermassive black holes
• Revisiting the unification of tidal disruption events with polarimetry
• Science with a large field-of-view polarization survey: The Large Array Survey Telescope Polarization Node (LAST-P)