Parkes observations for project P455 semester 2024APRS_02

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.

本项目旨在对首个双脉冲星系统开展持续计时与脉冲轮廓研究，该系统是引力物理学研究的独特实验室。我们于2021年10月发表在《物理评论X》(Phys. Rev. X)第11卷的53页研究论文（Kramer等，2021）中所报道的重要成果，涵盖了高阶光传播效应与轨道相对论形变的首次测量结果，同时凸显了针对这一特殊系统开展长期观测计划（含甚长基线干涉测量（VLBI）观测）的重要意义。本项目的核心目标是对广义相对论开展迄今为止最为严苛的检验，并首次实现中子星转动惯量的测量。此外，我们还将测定该系统的几何结构，通过测地岁差绘制脉冲星波束的辐射分布图，并搜寻脉冲星B的重现信号。本研究将依托UWL接收机（UWL receiver）的高灵敏度与宽带宽特性开展观测。持续推进本项目至关重要，可与近期启动的双脉冲星系统MeerKAT计时观测形成观测重叠。