Parkes observations for project P965 semester 2018APRS_BPSR_01

The deployment of the new ultra-wide-band receiver UWL enables a plethora of experiments which were previously not possible or very difficult. One immediate benefit for pulsar timing studies is the significantly increased ratio of available radio frequency bandwidth to the decorrelation bandwidth as induced by the ionised interstellar medium (ISM). PSR J1933-6211 is a strongly-scintillating millisecond pulsar. Due to its scintillation, previous studies failed to measure the mass and orbital parameters of this system and instead provided limits. With the UWL we expect more reliable detection of bright scintles during every observation; and hence improved and reliable timing precision that will allow a mass measurement through Shapiro-Delay detection. As an additional benefit, we can use the broad band to adequately study the scintillation properties of this pulsar and thereby constrain its orbital inclination. \r\n The mass of the pulsar is potentially the lowest known, depending on the type of its white dwarf companion. By measuring it we will also determine the type of the white dwarf which is interesting in its own right and is one of the coolest such objects known (Antoniadis, priv. comm.). Finally, we will verify if, as we expect, the precision attainable with the increased bandwidth is sufficient for high-precision pulsar timing and inclusion of PSR J1933-6211 in pulsar timing array experiments.

新型超宽带接收机（UWL）的部署为众多此前无法开展或实施难度极大的实验提供了可能。对脉冲星计时研究而言，一个直接的益处是可用射频带宽与由电离星际介质（ISM）引起的去相关带宽之比显著提高。PSR J1933-6211是一颗强闪烁毫秒脉冲星。由于其闪烁特性，此前的研究未能测量该系统的质量和轨道参数，仅给出了限值。借助UWL，我们有望在每次观测中更可靠地探测到明亮的闪烁点；进而获得更高且更稳定的计时精度，这将通过夏皮罗延迟（Shapiro-Delay）探测实现质量测量。此外，我们还可利用宽带充分研究该脉冲星的闪烁特性，从而限制其轨道倾角。这颗脉冲星的质量可能是目前已知的最低值，具体取决于其白矮星伴星的类型。通过测量其质量，我们还将确定该白矮星的类型——这种白矮星本身就极具研究价值，且是已知最冷的此类天体之一（Antoniadis，私人通讯）。最后，我们将验证：正如预期的那样，带宽增加所带来的精度是否足以支持高精度脉冲星计时，并将PSR J1933-6211纳入脉冲星计时阵列实验。