Parkes observations for project P1032 semester 2024APRS_06

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 ends in early 2024, observations with the UWL receiver will now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Under these circumstances we have revamped the source selection in this proposal such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars. 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，即利用帕克斯超宽带低（UWL）接收机获取的数据，快速测定南天双星脉冲星系统的相对论参数。随着MeerKAT射电望远镜的MeerTime项目于2024年初收官，依托UWL接收机开展的观测将成为拓展本项目此前纳入的大量脉冲星计时基线的核心支撑。有鉴于此，我们对本提案的源选择方案进行了优化调整，确保UWL接收机是兼具通用性与适配性的最优仪器，可为所选脉冲星达成预设科学目标。本团队将利用UWL数据获取这些脉冲星的有效轨道覆盖范围与计时基线，并得到轨道与时域色散量（DM）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）质量的测量样本量并优化现有约束，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。我们申请为该项目在下一观测周期预留预分配观测资格。