论文标题
PSR J1023+0038中Neutron Star的永久椭圆度
The permanent ellipticity of the neutron star in PSR J1023+0038
论文作者
论文摘要
具有椭圆度的毫秒的脉冲星，即其自旋轴周围的不对称质量分布，可能会发出连续的重力波，到目前为止尚未检测到。推断这种波的一种间接方法是估计波对脉冲星的旋转速率的贡献。过渡性PULSAR PSR J1023+0038对于此目的是理想的，并且是独一无二的，因为这是唯一在积聚和非精神状态下测量旋转速率的唯一毫秒的脉冲星。在这里，我们从基于完整的扭矩预算方程式的形式主义和两种状态下观察到的$γ$ rays的Pulsar磁层起源来推断，PSR J1023+0038应由于脉冲星的永久椭圆形而发出引力波。形式主义还以自吻的方式解释了该来源的其他主要观察方面。例如，我们的形式主义自然会渗透到脉冲星磁层中的积聚盘渗透，并使用标准和良好接受的场景解释了在积聚状态下观察到的X射线脉动。反过来，这在积聚状态下渗透了较大的脉冲星旋转功率，在我们的形式主义中，它解释了在该状态下观察到的较大的$γ$ ray发射。探索PSR J1023+0038的参数值的宽范围，并且没有假设在积聚状态下具有恒星椭圆的来源，我们发现Pulsar的质量四极力矩在$（0.92-1.88）范围内$（0.48-0.93）\ times10^{ - 9} $。
A millisecond pulsar having an ellipticity, that is an asymmetric mass distribution around its spin-axis, could emit continuous gravitational waves, which have not been detected so far. An indirect way to infer such waves is to estimate the contribution of the waves to the spin-down rate of the pulsar. The transitional pulsar PSR J1023+0038 is ideal and unique for this purpose, because this is the only millisecond pulsar for which the spin-down rate has been measured in both accreting and non-accreting states. Here we infer, from our formalism based on the complete torque budget equations and the pulsar magnetospheric origin of observed $γ$-rays in the two states, that PSR J1023+0038 should emit gravitational waves due to a permanent ellipticity of the pulsar. The formalism also explains some other main observational aspects of this source in a self-consistent way. As an example, our formalism naturally infers the accretion disc penetration into the pulsar magnetosphere, and explains the observed X-ray pulsations in the accreting state using the standard and well-accepted scenario. This, in turn, infers the larger pulsar spin-down power in the accreting state, which, in our formalism, explains the observed larger $γ$-ray emission in this state. Exploring wide ranges of parameter values of PSR J1023+0038, and not assuming an additional source of stellar ellipticity in the accreting state, we find the misaligned mass quadrupole moment of the pulsar in the range of $(0.92-1.88)\times10^{36}$ g cm$^2$, implying an ellipticity range of $(0.48-0.93)\times10^{-9}$.
