Parkes observations for project P1005 semester 2020APRS_02

We propose to conduct observations of PSR J1812-15, a of 1-s pulsar which exhibits both nulling behaviour and clear evidence of acceleration, suggesting that it is in a binary system. 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 PSRs J1812-15, determination of an orbital or phase-connected solution has so far proved impossible, but both of these steps are vital in allowing for the pulsar?s continued study. We propose a targeted, high-cadence observing campaign designed to map the orbits of this pulsar while simultaneously factoring in the redundancy required in order to overcome its nulling behaviour. By studying this pulsar, we hope to provide new insight into an unusual class of pulsar binary, as well to constrain the nulling properties of the pulsar.

我们提议对PSR J1812-15开展观测研究，这是一颗周期为1秒的脉冲星，既表现出消零行为（nulling behaviour），又存在明显的加速迹象，暗示其处于双星系统中。双星脉冲星是极具科学价值的研究对象，应用场景广泛，涵盖引力检验、中子星状态方程探测以及恒星演化的化石记录等领域。双星系统中的长自转周期脉冲星通常远少于自转更快的再生脉冲星，且是脉冲星双星演化中尚未充分探索的领域。由于PSR J1812-15的消零行为，目前尚无法确定其轨道解或相位关联解，但这两项工作对于该脉冲星的后续研究至关重要。我们提议开展针对性的高cadence观测计划，旨在绘制该脉冲星的轨道，同时纳入克服其消零行为所需的冗余设计。通过对这颗脉冲星的研究，我们期望能为这一特殊类型的脉冲星双星系统提供新的见解，并对其消零特性加以约束。