Parkes observations for project P1345 semester 2025APRS_18

This proposal aims to constrain burst rates and spin down properties of a sample of new Rotating Radio Transients (RRATs) discovered with the ASKAP CRAFT Coherent upgrade (CRACO) system. Over the past 12-months of commissioning, CRACO discovered and precisely localised 15 new RRATs, characterised by their sporadic pulses with dispersion measures (DM) consistent with Galactic sources. We request 22.5h of Parkes time split into three 30min observations spanning 6-months for each target. This can help constrain periods and potentially phase-coherent timing solutions given that we already have arcsec-precision interferometric localisations. Our main science goals are: 1) to measure their burst rates, periods, and spin-down properties; 2) to assess their nulling fraction and intermittency; 3) to measure their polarimetric properties and constrain their emission mechanism; 4) to determine if the CRACO RRATs are fundamentally different from the known RRAT population. Some of these goals can be answered even with the detection of a limited number of pulses.

本提案旨在约束依托澳大利亚平方千米阵列探路者（ASKAP）的CRAFT相干升级系统（CRACO）新发现的一批旋转射电暂现源（Rotating Radio Transients，RRATs）样本的爆发率与自转衰减特性。在过去12个月的调试阶段中，CRACO已发现并精确定位了15颗新的旋转射电暂现源，这类源以间歇性脉冲为特征，且其色散量（DM）符合银河系内射电源的预期特征。我们申请获得22.5小时的帕克斯望远镜观测时间，将其拆分为针对每个目标的三次30分钟观测，观测周期跨度为6个月。鉴于我们已获取角秒级精度的干涉定位结果，此次观测可帮助约束这些源的自转周期，且有望获得相位相干的计时解。我们的核心科学目标如下：1）测量其爆发率、自转周期及自转衰减特性；2）评估其脉冲消隐比例与间歇性特征；3）测量其偏振特性并约束其辐射机制；4）判断CRACO发现的旋转射电暂现源是否在本质上区别于已发现的RRATs种群。即便仅探测到少量脉冲，上述部分科学目标也可得到解答。