Parkes observations for project P455 semester 2023OCTS_01

This project is to continue timing and profile studies of the first double-pulsar system, a unique laboratory for gravitational physics. Important results published in our 53-page Phys. Rev. X paper (Kramer et al., Vol 11, October 2021) include the first measurements of higher-order light-propagation effects and of the relativistic deformation of the orbit and highlight the importance of a long term observational campaign, including VLBI observations, for this remarkable system. The main aims of this proposal are to provide the strongest tests to date for general relativity and to measure for the first time the moment-of-inertia of a neutron star. Additionally, we will determine the system geometry, map the pulsar beams via geodetic precession, and search for the reappearance of Pulsar B. We exploit the high sensitivity and broad bandwidth of the UWL receiver. Continuation of this project is vital to provide overlap with MeerKAT timing observations of the Double Pulsar system which commenced recently.

本项目旨在延续对首个双脉冲星系统的计时与轮廓研究，该系统是引力物理学研究的独特实验平台。我们于2021年10月发表于《物理评论X》（Phys. Rev. X）第11卷、共53页的论文（Kramer等）中披露的重要成果，包含了首次对高阶光传播效应以及轨道相对论形变的测量，同时凸显了针对该卓越系统开展长期观测计划（含甚长基线干涉测量（Very Long Baseline Interferometry, VLBI）观测）的重要性。本申请的核心目标是为广义相对论提供截至目前最为严苛的检验，并首次测量中子星的转动惯量。此外，我们将测定该系统的几何结构，通过测地进动（geodetic precession）绘制脉冲星波束分布图，并搜寻脉冲星B的重现信号。本项目将利用UWL接收机的高灵敏度与宽带宽特性。延续本项目至关重要，可与近期启动的双脉冲星系统MeerKAT计时观测形成数据重叠。