Parkes observations for project P1342 semester 2024OCTS_02

We have discovered an eclipsing binary millisecond pulsar in image-plane searches. Follow-up work confirmed that the source has pulsations and a Fermi association, revealing that it is a millisecond pulsar (MSP). The MSP is in a compact binary orbit with an optical companion. The duration of the eclipses suggests that this is a ``spider'' system, with an eclipsing material. The formation and evolution of spider systems are still poorly understood. Timing of this system will allow us to constrain the orbit of the system so that we can explore the eclipse cut-off frequency and change in electron column density of the eclipse. It would also improve predictions of the eclipsing binary pulsar and MSP population detectable by upcoming, highly sensitive image-plane surveys at low frequencies using precursors to, and eventually, the Square Kilometre Array (SKA) itself. The detection of MSPs also provides compelling evidence that the Fermi gamma-ray excess is coming from thousands of MSPs.

我们通过图像平面巡天搜索发现了一颗食双星毫秒脉冲星（millisecond pulsar, MSP）。后续观测证实该源存在脉冲信号且与费米望远镜存在关联，进而确认其为毫秒脉冲星（MSP）。该毫秒脉冲星处于拥有光学伴星的致密双星轨道系统中。其掩食时长表明该系统属于“蜘蛛”系统，存在掩食物质。目前学界对蜘蛛系统的形成与演化机制仍知之甚少。对该系统开展计时观测，将帮助我们限定其轨道参数，进而研究掩食截止频率以及掩食区域的电子柱密度变化。该观测还将优化食双星脉冲星及MSP族群的预测模型，这些源可通过即将开展的低频高灵敏度图像平面巡天进行探测，该巡天将依托平方千米阵（Square Kilometre Array, SKA）的先期设备及最终建成的平方千米阵本身。此次MSP的探测结果，也为“费米伽马射线超出信号源自数千颗毫秒脉冲星”这一论断提供了极具说服力的证据。