Parkes observations for project P1058 semester 2021OCTS_03

We propose to continue the timing campaign of the new millisecond pulsar, J1431-6328, discovered by the Australian SKA Pathfinder (ASKAP). PSR J1431-6328 has a spin period of 2.77 ms and is in a very wide binary system with an orbital period of 88 days. The extremely low mass of the companion and the long orbital period make this binary system unique for the understanding of binary evolution. The stable profile and wide orbit of J1431-6328 also makes it a good candidate for pulsar timing arrays and tests of the strong equivalence principle. Combing one month of high cadence timing with previous regular monitoring, we aim to obtain a coherent timing solution of PSR J1431?6328 and measure its astrometric and orbital parameters with high precision. Results on the timing solution, wide band polarisation properties of this pulsar and studies of the binary system will be published at the end of this semester.

本研究计划推进由澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder，ASKAP）发现的新毫秒脉冲星J1431-6328的计时观测项目。该脉冲星PSR J1431-6328的自转周期为2.77毫秒，处于轨道周期长达88天的极宽双星系统中。伴星质量极低且轨道周期极长，使得该双星系统在双星演化理论研究中具备独特价值。J1431-6328稳定的脉冲轮廓与宽轨道特性，使其成为脉冲星计时阵列研究与强等效原理（strong equivalence principle）检验的优质候选体。本研究结合为期一个月的高采样率计时观测数据与既往常规监测结果，旨在获得PSR J1431-6328的连贯计时解，并以高精度测定其天体测量与轨道参数。本项研究关于计时解、该脉冲星的宽带偏振特性以及双星系统的相关研究成果，将于本学期末正式发表。