Parkes observations for project P1032 semester 2025APRS_03

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 APRS2024 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. We request pre-graded status for this project for the next semester.

本提案旨在延续P1032项目，即依托帕克斯（Parkes）超宽带低（Ultra Wideband Low, UWL）接收机数据，对南天双星脉冲星系统的相对论参数开展快速测量。由于位于MeerKAT射电望远镜的MeerTime项目已于2024年初终止，依托UWL接收机开展的观测现已成为延续该项目中众多脉冲星计时基线的核心支撑。鉴于APRS2024中的源选择已量身定制，使UWL接收机成为适配所选脉冲星科学目标的最优（且多功能）仪器，因此我们提议延续此类观测。我们将利用UWL接收机数据，获取这些脉冲星的完整轨道覆盖与计时基线，并对轨道与时域色散量（Dispersion Measure, DM）变化得到重要约束，这将有助于明确其伴星的物理性质。增加已测量的中子星（Neutron Star, NS）质量样本量，并优化现有约束结果，对中子星内部结构研究以及恒星与双星演化物理均具有深远意义。我们申请为本项目在下一学期获得预分配观测资格。