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Disentagling the optical emission mechanisms in tidal disruption events

P69-009 Koljonen


Tidal disruption events (TDEs) are ideal targets to probe the formation of accretion disks and accompanying outflows. Multiwavelength observations of TDEs have revealed a surprisingly diverse population. Especially, the so-called optical TDEs have shown late-time X-ray and radio emission years after the optical peak emission indicating delayed accretion disk formation and long timescales for the circularization process. Therefore, the origin of the prompt optical emission of these events remains unclear. Here, we propose imaging polarimetry of tidal disruption events to understand the location and properties of the optical emission and subsequently the formation process of the accretion disk around supermassive black holes. ***


Internal flats, arcs and bias frames from alfosc-calibs


Our immediate objective is to follow the polarization evolution of optically bright TDEs. Observations should be done in 2-3 weeks cadence (8 in total for one target). For each observation, we require linear polarimetric observations in two different filters (Bessel V and R) using the standard ALFOSC setup. Please, make sure to center the target in the image. The PI will send the target and observing information using the OB generator when this ToO is triggered (2 triggers/targets in total).

Available scripts

Go to the directory
  cd ~/scripts/69-009

execute the requested scripts.

Program Tracking
Proposal 69-009
Semester P69: 20240401 - 20241001
Principal Investigator K. Koljonen
Programme Disentagling the optical emission mechanisms in tidal disruption events
Instrument ALFOSC
Time Allocation 2 targets, 8 obs./target, 50m/obs.
Total Nights 13.3h
Type Mon
Notes Fixed dates to be scheduled after trigger
Total Time Spent 02:13 (hh:mm)
Proposal Date Time Type Targets Files Comments Status
69-009 2024-06-08 00:44 Mon AT2024gre ALHf080167 - ALHf080174 Both blocks observed in immediate succession. Clear skies, sub arcsec seeing. Observed
69-009 2024-06-16 00:44 Mon AT2024gre ALHf160064 - ALHf160071 Both blocks observed consecutively in clear skies, subarcsec seeing. Observed
69-009 2024-06-19 00:45 Mon AT2024gre ALHf190145 - ALHf190152 Clear skies and 1-arcsec seeing. Please note that it was triggered on the queue as a Soft ToO, but it is being reported as a Monitor. Observed


The above information is collected from the ToO/Mon reports that have been created by the observer.

Should any of the observations have been carried out using the OB system, you will find additional information HERE

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