论文标题
在层次三重系统中，黑色Widow Pulsar PSR PSR J1555-2908是吗？
Is the black-widow pulsar PSR J1555-2908 in a hierarchical triple system?
论文作者
论文摘要
最初在无线电中发现的559 Hz Black-Widow Pulsar PSR J1555-2908也是明亮的伽马射线脉冲星。使用12年的费米 - 拉特伽玛射线数据进行脉动的时间脉动揭示了其自旋频率的长期变化，这些变化比其他毫秒脉冲星所观察到的要大得多。虽然脉冲星旋转速率的这种变异性可能是固有的“时机噪声”，但在这里我们考虑了另一种解释：变化是由于中子星和低质量伴侣在多年的多年轨道中存在非常低质量的第三个对象而产生的。借助当前数据，该分层三体系统模型比最合适的正时噪声模型更准确地描述了脉冲星的旋转。未来的观察结果将表明这种替代解释是否正确。
The 559 Hz black-widow pulsar PSR J1555-2908, originally discovered in radio, is also a bright gamma-ray pulsar. Timing its pulsations using 12 yr of Fermi-LAT gamma-ray data reveals long-term variations in its spin frequency that are much larger than is observed from other millisecond pulsars. While this variability in the pulsar rotation rate could be intrinsic "timing noise", here we consider an alternative explanation: the variations arise from the presence of a very-low-mass third object in a wide multi-year orbit around the neutron star and its low-mass companion. With current data, this hierarchical-triple-system model describes the pulsar's rotation slightly more accurately than the best-fitting timing-noise model. Future observations will show if this alternative explanation is correct.
