Parkes observations for project P1172 semester 2023OCTS_10

PSR J1713+0747 is a very important millisecond pulsar for global pulsar timing array campaigns, due to its long-term observation history, very stable and narrow profile and strong S/N. In April 2021, the pulsar experienced a significant event related to a change in its magnetosphere, presented as an observable change in the pulsar profile. Since then, the pulsar has been slowly recovering and we wish to observe this recovery with high-cadence observations to allow us to create a detailed time-resolved series of variations in the MSPs profile, polarisation, and other properties. Under this proposal, we wish to probe the profile recovery on weekly timescales (once per week per month), revealing additional short timescale behaviours, indicative of changes in the magnetosphere which are not available to other telescopes in the world, thanks to the Parkes UWL. This will also allow us to determine if the magnetosphere has returned to its original configuration or is settling into a new one. Understanding the recovery of this event is key for demonstrating that such pulsars are still viable clocks for use in gravitational wave studies, and in turn, provide us with new data on how the normally stable magnetosphere of this millisecond pulsar responds to an impulsive change in state.PSR J1713+0747是一颗对全球脉冲星计时阵列（Pulsar Timing Array）项目至关重要的毫秒脉冲星（millisecond pulsar），其具备长期观测历史，脉冲轮廓极稳定且窄化，信噪比（Signal-to-Noise Ratio, S/N）极高。2021年4月，该脉冲星发生了一次与其磁层变化相关的显著事件，表现为脉冲轮廓出现可观测的改变。自此之后，这颗脉冲星一直在缓慢恢复，我们希望通过高时间分辨率观测追踪这一恢复过程，以获取该毫秒脉冲星轮廓、偏振及其他特性变化的详细时间分辨序列。在本提案框架下，我们计划以周为时间尺度开展观测（每月每周一次），以此揭示额外的短时标行为——这类变化反映了磁层的状态改变，而凭借Parkes UWL设备的观测优势，这类信号是全球其他望远镜无法捕捉到的。本研究还将帮助我们确定该磁层是否恢复至初始构型，或是正稳定至新的稳定状态。阐明此次事件的恢复过程，对于证明这类脉冲星仍可作为引力波研究中的可靠时钟至关重要，同时也能为我们提供该原本稳定的毫秒脉冲星磁层如何响应状态突变的全新观测数据。