arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2202.05482astro-ph.HE
收藏

黑寡妇脉冲星PSR J1555-2908是否在一个等级三元系中?

Is the black-widow pulsar PSR J1555-2908 in a hierarchical triple system?

L. Nieder, M. Kerr, C. J. Clark, P. Bruel, H. T. Cromartie, S. M. Ransom, P. S. Ray

摘要:

559 Hz黑寡妇脉冲星PSR J1555-2908最初是在无线电中发现的,也是一颗明亮的伽马射线脉冲星。使用12年的费米-LAT伽马射线数据对其脉动进行计时,揭示了其自旋频率的长期变化,这些变化远远大于从其他毫秒双星中观察到的变化。虽然脉冲星旋转速率的这种变化可能是内在的“定时噪声”,在这里,我们考虑另一种解释:变化产生于一个非常低质量的第三个对象在一个广泛的多年轨道周围的中子星和它的低质量的同伴。根据目前的数据,这种分层三系统模型比最佳拟合的时间噪声模型更精确地描述了脉冲星的旋转。未来的观察将表明这种替代解释是否正确。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑