论文标题
黑寡妇伴侣的总重力四极矩的首次测量
First measurement of the total gravitational quadrupole moment of a black widow companion
论文作者
论文摘要
我们介绍了蜘蛛脉冲星的伴侣星的重力四极力矩的第一个测量，即黑寡妇PSR J2051 $ - $ 0827。为此，我们使用了一个新模型重新分析了无线电定时数据，该模型能够考虑由潮汐和离心变形引起的恒星以及一般相对性引起的植物periastron进动。该模型允许四极力矩的时变成分，因此自愿意考虑了这些系统中观察到的轨道周期变化不良的变化。我们的分析导致蜘蛛系统中第一次检测$ \dotΩ= -68.6 _ { - 0.5}^{+0.9} $ deg/yr，并且最准确的轨道偏心确定PSR J2051 $ - $ 0827的轨道偏心率与$ 0827，$ 0827具有$ e =（4.2 \ e =（4.2 \ pp pm 0.1）。我们表明，可变四极组件比平均四极矩$ \ bar {q} = -2.2 _ { - 1}^{+0.6} \ times 10^{41} $ kg.m $ $ $^2 $小100倍。我们讨论了伴随恒星高精度光光曲线的准确建模将允许其APSidal运动常数从我们的结果中得出。
We present the first measurement of the gravitational quadrupole moment of the companion star of a spider pulsar, namely the black widow PSR J2051$-$0827. To this end we have re-analysed radio timing data using a new model which is able to account for periastron precession caused by tidal and centrifugal deformations of the star as well as by general relativity. The model allows for a time-varying component of the quadrupole moment, thus self-consistently accounting for the ill-understood orbital period variations observed in these systems. Our analysis results in the first detection of orbital precession in a spider system at $\dotω = -68.6_{-0.5}^{+0.9}$ deg/yr and the most accurate determination of orbital eccentricity for PSR J2051$-$0827 with $e = (4.2 \pm 0.1) \times 10^{-5}$. We show that the variable quadrupole component is about 100 times smaller than the average quadrupole moment $\bar{Q} = -2.2_{-1}^{+0.6} \times 10^{41}$ kg.m$^2$. We discuss how accurate modelling of high precision optical light curves of the companion star will allow its apsidal motion constant to be derived from our results.
