Parkes observations for project P1032 semester 2019OCTS_03

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.

本研究拟对南天双中子星（double neutron star, DNS）系统开展计时观测，以精确测定其成员星质量，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）接收机灵敏度的提升将使脉冲到达时间（time of arrivals, ToAs）的测量精度提升3倍。这使得我们有望在未来1至2年内，快速完成一批双星系统的质量测定工作。我们还将在关键轨道相位下利用MeerKAT望远镜开展观测，以提升质量测量的成功率。已测得的中子星质量样本数量的增加，对于理解中子星内部结构以及恒星与双星演化物理机制具有重要意义。