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是全球脉冲星计时阵列（Pulsar Timing Array, PTA）观测项目中至关重要的一颗毫秒脉冲星，其拥有长期观测历史、极稳定且窄化的脉冲轮廓以及极高的信噪比（Signal-to-Noise Ratio, S/N）。2021年4月，该脉冲星发生了一起与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，该脉冲星持续缓慢恢复，我们计划通过高重访频率的观测对这一恢复过程开展监测，以获取该毫秒脉冲星的脉冲轮廓、偏振特性及其他属性的高时间分辨变化序列。基于本观测提案，我们将以周时标尺度开展轮廓恢复监测（每月内每周开展一次观测），以期揭示此前未被捕捉到的短时标行为——这类行为反映了磁层的变化，而依托Parkes UWL设备，我们能够获取全球其他望远镜无法获得的此类观测数据。本研究还将帮助我们判断该磁层是否已回归初始构型，或是正稳定为全新的稳态构型。阐明此次事件后的恢复过程，对于证实此类脉冲星仍可作为引力波研究中的可靠计时基准至关重要，同时也能为我们揭示这颗通常处于稳定状态的毫秒脉冲星，其磁层在遭遇突发性状态改变后的响应机制提供全新的观测数据。