Parkes observations for project P1032 semester 2025OCTS_04

With this proposal, we aim to continue P1032, the rapid measurements of relativistic parameters of southern binary pulsar systems using data from the Parkes Ultra Wideband Low (UWL) receiver. As the MeerTime project at the MeerKAT radio telescope ended in early 2024, observations with the UWL receiver now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Since the source selection in the previous semesters was tailored such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars, we propose to continue these observations. We will use the UWL data to obtain significant orbital coverage and timing baselines on these pulsars and obtain important constraints on orbital and temporal DM variations that will help in identifying the nature of the companion stars. Increasing the number of measured Neutron Star (NS) masses, as well as improving on current constraints has profound implications for NS internal structure and for stellar and binary evolution physics.本提案旨在延续P1032项目，即利用帕克斯超宽带低频（UWL）接收机的观测数据，快速测量南天双脉冲星系统的相对论性参数。由于MeerKAT射电望远镜的MeerTime项目已于2024年初终止，目前依托UWL接收机的观测数据，已成为拓展该项目中多数脉冲星计时基线的核心支撑。鉴于此前各观测季的源选择均适配UWL接收机——该设备亦是实现所选脉冲星科学目标的最优且最通用的观测工具，因此我们提案继续开展此类观测工作。我们将利用UWL接收机的观测数据，获取这些脉冲星的有效轨道覆盖范围与计时基线，并得到轨道与色散量（DM）随时间变化的重要约束条件，这将有助于明确伴星的本质属性。增加中子星（Neutron Star，NS）质量的测量样本量，同时优化现有约束结果，对中子星内部结构研究以及恒星与双星演化物理研究均具有深远意义。