Parkes observations for project P1339 semester 2024OCTS_04

After applying an unsupervised machine learning pipeline to dataset, we found a series of "unknown-unknown" source in the sky. In the position right ascension 20:47:34.4 and declination -16:42:03, we found a broadband signal that last a few seconds. However, through the 60 second observation it repeats. The observations corresponded to testing the multibeam system by pointing each of the beams in turn at a pulsar. Our signal was detected in eight different beams in sequence (not the pulsar beam), with the same position at right ascension 20:47:34.4 and declination -16:42:03. Within a 0.23 deg radius to the anomalous event, GAIA has identified a total of four sources located within 100 pc. One of them is Gaia DR3 6886074198993703168, a white dwarf candidate. We speculate that the observed anomalous event could potentially be a stellar flare originating from one of the stars within the covered region. If this anomalous event comes from a white dwarf, then it could be the second confirmed radio active pulsar emitting white dwarf after AR Sco.

我们将无监督机器学习流水线（unsupervised machine learning pipeline）应用于该数据集后，在天空中发现了一系列"未知未知（unknown-unknown）"天体源。在赤经20:47:34.4、赤纬-16:42:03的位置，我们探测到一段持续数秒的宽带信号。然而在60秒的观测时长内，该信号出现了重复。本次观测的任务是通过将多波束系统的各波束依次对准脉冲星（pulsar），以完成对该系统的测试。我们发现的信号在8个不同波束中按顺序被探测到（并非对准脉冲星的波束），其位置仍为赤经20:47:34.4、赤纬-16:42:03。在此次反常事件的0.23度半径范围内，盖亚卫星（GAIA）共识别出4个位于100秒差距（pc）以内的天体源。其中一个天体源为Gaia DR3 6886074198993703168，是一颗白矮星候选体。我们推测，此次观测到的反常事件可能源自覆盖区域内某颗恒星的恒星耀斑（stellar flare）。若此次反常事件源自一颗白矮星，那么它将成为继AR Sco之后第二颗被证实的可发射射电脉冲的白矮星。