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We request a 50-ks XMM-Newton observation of an X-ray-luminous tidal disruption event during Cycle 20 in order to track its long-term X-ray flux behaviour comma and to clarify lingering questions regarding its early flux evolution. The event comma which occurred in the galaxy SDSS J143359.16+400636.0 at z=0.099 comma first detected in February 2020 comma reached a peak luminosity of 10elev44 erg s 1 in the 0.3-10 keV X-ray band comma which was around 20 times more than the peak optical-UV luminosity. Optical comma UV comma and X-ray lightcurves showed a decline in flux from the source consistent with telev 5-3. The start time of the X-ray emission is unclear comma which has implications for the X-ray emission mechanism comma but an observation at long time scales with XMM with clarify this.

我们申请在第20观测周期（Cycle 20）利用XMM-牛顿望远镜（XMM-Newton）开展一次时长50千秒的观测，目标为一颗X射线明亮的潮汐破坏事件（Tidal Disruption Event, TDE），以期追踪其长期X射线通量行为，并厘清其早期通量演化相关的遗留问题。该事件发生于红移z=0.099的星系SDSS J143359.16+400636.0中，于2020年2月首次被探测到，在0.3-10 keV的X射线波段其峰值光度可达10⁴⁴ erg·s⁻¹，约为其光学-紫外波段峰值光度的20倍。光学、紫外及X射线光变曲线显示，该源的通量衰减符合t的-5/3次方演化规律。X射线辐射的起始时间尚不明确，这对X射线辐射机制的研究具有重要参考价值，而借助XMM-牛顿望远镜开展的长时间尺度观测将厘清这一问题。