Parkes observations for project P1172 semester 2023OCTS_04

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是全球脉冲星计时阵列项目中极具重要性的毫秒脉冲星，因其拥有长期观测历史、稳定且窄的轮廓以及高S/N。2021年4月，该脉冲星发生了一次与磁层变化相关的重大事件，表现为其轮廓出现可观测的改变。此后，该脉冲星持续缓慢恢复，我们希望通过高cadence观测记录这一恢复过程，以便构建毫秒脉冲星（MSP）轮廓、极化及其他属性的详细时间分辨变化序列。本提案旨在通过每周时间尺度（每月每周一次）探测轮廓恢复过程，揭示更多短时间尺度行为——这些行为反映了磁层的变化，而得益于帕克斯超宽带接收机（Parkes UWL），此类变化是世界上其他望远镜无法观测到的。这也将帮助我们确定磁层是否已恢复至原始状态，或是正稳定在新的构型中。理解此次事件的恢复过程，对于证明此类脉冲星仍是引力波研究中可靠的时钟至关重要，同时也能为我们提供新的数据，以了解这颗毫秒脉冲星通常稳定的磁层如何应对状态的突发变化。