Parkes observations for project P1177 semester 2023APRS_06

We propose to time a high Galactic latitude millisecond pulsar, J1947-18, which was previously identified as isolated. Recently, during the re-processing of Parkes archival data (Project code: P1059), we found that this pulsar is in a binary system. This pulsar was originally discovered in archival data of the intermediate and high Galactic latitude parts of the Southern High Time Resolution Universe pulsar survey and have rotational period of 2.60 ms and DM of 25 pc cm-3. Here we propose make use of Parkes non-Galactic observing time and confirm the nature of this potential binary and measure its spin and orbital parameters. This information could lead to new opportunities of measuring neutron star mass, testing gravitational theories, and MSPs formation channels at high galactic latitudes.

本研究拟对一颗高银纬毫秒脉冲星J1947-18开展计时观测，该天体此前被判定为孤立脉冲星。近期，我们在重新处理帕克斯（Parkes）存档数据（项目编号：P1059）时，发现该脉冲星实际处于双星系统之中。该脉冲星最初是在南天高时间分辨率宇宙脉冲星巡天（Southern High Time Resolution Universe pulsar survey）的银纬中高纬度区域存档数据中被发现的，其自转周期为2.60毫秒，色散量（DM, Dispersion Measure）为25 pc cm⁻³。据此，我们申请利用帕克斯望远镜的非银河观测时段，以确认该候选双星系统的本质并测量其自转与轨道参数。相关研究成果将为高银纬区域的中子星质量测定、引力理论检验，以及毫秒脉冲星（MSPs, Millisecond Pulsars）的形成通道探索提供全新契机。