Parkes observations for project P455 semester 2022OCTS_05

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., December 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 and map the pulsar beams via geodetic precession. We will exploit the high sensitivity and broad bandwidth of the UWL receiver.

本项目旨在对首个双脉冲星系统开展时序与轮廓研究，该系统是引力物理学研究的独特实验室。我们于2021年12月发表在53页篇幅的《物理评论X》（*Phys. Rev. X*）论文（Kramer等人）中公布的重要成果，包含了高阶光传播效应与轨道相对论形变的首批测量结果，同时凸显了针对该特殊系统开展长期观测计划（包括甚长基线干涉测量（Very Long Baseline Interferometry，VLBI）观测）的重要性。本项目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，并首次实现对中子星转动惯量的测量。此外，我们将通过测地进动确定该系统的几何结构，并绘制脉冲星波束分布图。本研究将利用UWL接收机的高灵敏度与宽带宽特性。