Parkes observations for project P1005 semester 2019APRS_02

We propose to conduct observations of PSRs J1812-15 and J1831-04, a pair of 1-s pulsars which exhibit both nulling behaviour and clear evidence of acceleration, suggesting that they are in binary systems. Binary pulsars are valuable objects of scientific study, allowing for a wide range of applications, including tests of gravity, probes of the neutron star equation of state and fossil records of stellar evolution. Long spin-period pulsars in binary systems are generally much rarer than faster-spinning recycled pulsars, and represent an under-explored region of pulsar binary evolution. Due to the nulling behaviour of both PSRs J1812-15 and J1831-04, determination of an orbital or phase-connected solution has so far proved impossible, but both of these steps are vital in allowing for their continued study. We propose a targeted, high-cadence observing campaign designed to map the orbits of these pulsars while simultaneously factoring in the redundancy required in order to overcome their nulling behaviour. By studying these pulsars, we hope to provide new insight into an unusual class of pulsar binary, as well to constrain the nulling properties of both pulsars.

我们提出对脉冲星J1812-15与J1831-04开展观测计划：这两颗自转周期为1秒的脉冲星同时表现出消零行为与明确的加速度证据，表明它们处于双星系统中。双星脉冲星是极具科学价值的研究对象，可应用于引力检验、中子星物态方程探测以及恒星演化化石记录研究等诸多领域。处于双星系统中的长自转周期脉冲星，通常比快速自转的再循环脉冲星更为稀少，且代表了脉冲星双星演化领域中一个尚未被充分探索的方向。由于这两颗脉冲星均存在消零现象，迄今为止仍无法确定其轨道解或相位关联解，但这两项工作对于开展后续研究至关重要。我们提出一项针对性的高采样率观测计划，旨在测绘这两颗脉冲星的轨道，同时兼顾抵消消零现象所需的观测冗余度。通过对这两颗脉冲星的研究，我们期望为一类特殊的双星脉冲星群体提供新的认知，并约束两颗脉冲星的消零特性。