Parkes observations for project P1032 semester 2019OCTS_13

We propose timing observations of southern double neutron star (DNS) systems to obtain precise estimates\r\nof the component masses and thus increase the statistics of neutron star mass distribution. The improved\r\nsensitivity of the Ultra Wideband Low (UWL) receiver will provide a 3X increase in the precision of the time\r\nof arrivals (ToAs) of the pulses compared to the multibeam data. This has the potential to perform quick\r\nmeasurements of masses for a number of binary systems in the next 1-2 years. We will also use MeerKAT\r\nobservations at crucial orbital phases to increase our chances of mass measurements. Increase in the number\r\nof measured NS masses has significant implications for understanding NS internal structure and for stellar\r\nand binary evolution physics.

本研究提出针对南天双中子星（double neutron star, DNS）系统开展计时观测，以期精准测定双星成员的质量，进而扩充中子星质量分布的统计样本。相较于多波束观测数据，超宽带低（Ultra Wideband Low, UWL）接收机的灵敏度提升可使脉冲到达时间（time of arrivals, ToAs）的测量精度提高3倍。该技术潜力有望在未来1至2年内实现对一批双星系统的快速质量测量。此外，我们将在关键轨道相位阶段利用MeerKAT开展观测，以提升质量测量的成功率。中子星质量测量样本的扩充，对于理解中子星内部结构以及恒星与双星演化物理机制均具有重要意义。