The Prospects of Finding Tidal Disruption Events with 2.5-Metre Wide-Field Survey Telescope (WFST) Based on Mock Observations
The Prospects of Finding Tidal Disruption Events with 2.5-Metre Wide-Field Survey Telescope (WFST) Based on Mock Observations
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基于模拟观测的2.5米广域巡天望远镜（WFST）寻找潮汐扰乱事件的前景
DOI：
10.1093/mnras/stac946
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发表时间：
2022
影响因子：
4.8
通讯作者：
X. Kong
中科院分区：
文献类型：
--
作者：
Zheyu Lin;N. Jiang;X. Kong
光时域测量是近十年来寻找罕见潮汐扰动事件的主要手段，极大地推动了潮汐扰动事件研究的发展。特别是，Zwicky瞬态设施（ZTF）开启了人口研究的时代，维拉鲁宾天文台（VRO）即将推出的大型天气调查望远镜（LSST）被认为将很快进一步彻底改变该领域。在这里，我们提出了寻找TDE的前景与另一个强大的调查将由2.5米宽视场巡天望远镜（WFST）进行。WFST位于中国西部，一旦投入使用，将成为北方半球最先进的光时域测量设施。我们选择在模拟观测的基础上评估其TDE可探测性，这是迄今为止最接近现实的，考虑到场地条件，望远镜参数，调查策略和瞬态搜索管道。我们对440 deg2场（CosmoDC2目录）的模拟观测表明，如果在u，g，r，i波段每10天曝光30秒，每年可以稳健地发现29 ± 6个TDE，其中发现定义为至少两个过滤器中≥10个划时代检测。如果WFST调查完全优化发现TDE，我们预计每年将识别392 ± 74个TDE，红移高达z ≥ 0.8，这对后续资源构成了巨大挑战。
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 deg2 field (CosmoDC2 catalogue) show that 29 ± 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 ≥10 epochal detections in at least two filters. If the WFST survey is fully optimized for discovering TDE, we would expect to identify 392 ± 74 of TDEs every year, with the redshift up to z ∼ 0.8, which poses a huge challenge to follow-up resources.