PSR J2051-0827伴星引力四极矩变化的证据
Evidence for gravitational quadrupole moment variations in the companion of PSR J2051-0827
摘要：
我们已经进行了日食毫秒脉冲双星J2051-0827与欧洲脉冲星定时阵列网络的望远镜和帕克斯射电望远镜，跨越13年的无线电定时观测。增加的数据跨度允许对轨道偏心率e =（6.2 { \pm } 1.3）{ \times } 10^{-5}和复合自行μ_t = 7.3 { \pm } 0.4 mas/yr进行有效测量。我们的定时观测揭示了脉冲星轨道的投影半长轴的长期变化，这比以前公布的要极端得多;和系统的轨道周期。对产生这种变化的物理机制的研究证实，半长轴的变化很可能是由双星系统中的经典自旋-轨道耦合引起的，而轨道周期的变化很可能是由潮汐耗散导致伴星引力四极矩的变化引起的。
英文摘要：
We have conducted radio timing observations of the eclipsing millisecond binary pulsar J2051-0827 with the European Pulsar Timing Array network of telescopes and the Parkes radio telescope, spanning over 13 years. The increased data span allows significant measurements of the orbital eccentricity, e = (6.2 {\pm} 1.3) {\times} 10^{-5} and composite proper motion, μ_t = 7.3 {\pm} 0.4 mas/yr. Our timing observations have revealed secular variations of the projected semi-major axis of the pulsar orbit which are much more extreme than those previously published; and of the orbital period of the system. Investigation of the physical mechanisms producing such variations confirm that the variations of the semi-major axis are most probably caused by classical spin-orbit coupling in the binary system, while the variations in orbital period are most likely caused by tidal dissipation leading to changes in the gravitational quadrupole moment of the companion.
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