The Prospects of Finding Tidal Disruption Events with 2.5-Metre Wide-Field Survey Telescope (WFST) Based on Mock Observations

Abstract

Optical time-domain survey has been the dominant means of hunting for rare tidal disruption events (TDEs) in the past decade and remarkably advanced the TDE study. Particularly, the Zwicky Transient Facility (ZTF) has opened the era of population studies and the upcoming Large Synoptic Survey Telescope (LSST) at the Vera Rubin Observatory (VRO) is believed to further revolutionize the field soon. Here we present the prospects of finding TDEs with another powerful survey to be performed by 2.5-metre Wide-Field Survey Telescope (WFST). The WFST, located in western China, will be the most advanced facility dedicated to optical time-domain surveys in the northern hemisphere once commissioning. We choose to assess its TDE detectability on the basis of mock observations, which is hitherto closest to reality by taking into consideration of site conditions, telescope parameters, survey strategy and transient searching pipeline. Our mock observations on 440 deg${}^2$ field (CosmoDC2 catalogue) show that $29\pm 6$ TDEs can be robustly found per year if observed at $u,g,r,i$ bands with 30-second exposure every 10 days, in which a discovery is defined as $\ge$10 epochal detections in at least two filters. If the WFST survey is fully optimized for discovering TDE, we would expect to identify $392\pm 74$ of TDEs every year, with the redshift up to $z\sim 0.8$, which poses a huge challenge to follow-up resources.

16 pages, 8 figures, 4 tables, accepted for publication in MNRAS

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Cited by in corpus (15)

• Sciences with the 2.5-meter Wide Field Survey Telescope (WFST)
• The unluckiest star: A spectroscopically confirmed repeated partial tidal disruption event AT 2022dbl
• The Luminosity Function of Tidal Disruption Flares for the ZTF-I Survey
• Limiting Magnitudes of the Wide Field Survey Telescope (WFST)
• Two Candidate Obscured Tidal Disruption Events Coincident with High-energy Neutrinos
• An Explanation for Overrepresentation of Tidal Disruption Events in Post-starburst Galaxies
• SN2017egm: A Helium-rich Superluminous Supernova with Multiple Bumps in the Light Curves
• Prospects of Searching for Type Ia Supernovae with 2.5-m Wide Field Survey Telescope
• AT 2023clx: the Faintest and Closest Optical Tidal Disruption Event Discovered in Nearby Star-forming Galaxy NGC 3799
• Target of Opportunity Observations Detectability of Kilonovae with WFST
• Search Capability for Near-Earth Objects with the Wide Field Survey Telescope
• Insights from the "Red devil" AT 2022fpx: A Dust-reddened Family of Tidal Disruption Events Excluded by Their Apparent Red Color?
• Real-time Light Curve Classification Framework for the Wide Field Survey Telescope Using Modified Semi-supervised Variational Auto-Encoder
• Rates of Strongly Lensed Tidal Disruption Events
• Discovery of a Featureless Tidal Disruption Event at z~1 with the Wide Field Survey Telescope