Parkes observations for project P1032 semester 2025OCTS_01

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：利用帕克斯超宽带低频率（Ultra Wideband Low, UWL）接收机获取的数据，对南天双星脉冲星系统的相对论参数开展快速测量。搭载于MeerKAT射电望远镜的MeerTime项目已于2024年初收官，依托UWL接收机开展的观测现已成为延续该项目中诸多脉冲星计时基线的核心支撑。鉴于此前观测学期的天体源筛选工作已针对候选脉冲星的既定科学目标完成适配，UWL接收机是实现该目标的最优且兼具通用性的观测仪器，因此我们提议延续此类观测。我们将依托UWL观测数据，获取这些脉冲星的充分轨道覆盖与可靠计时基线，并对轨道及时域色散量（DM）变化获得重要约束，从而助力明确伴星的物理性质。增加中子星（NS）质量的测量样本量，同时优化现有约束结果，将对中子星内部结构研究以及恒星与双星演化物理领域产生深远影响。