论文标题
快速旋转白矮人的重力波
Gravitational waves from fast-spinning white dwarfs
论文作者
论文摘要
研究了快速旋转白矮人（WDS）中引力波（GWS）发射的两种机制：物质和磁性变形的积聚。在这两种情况下，GW发射都是由恒星旋转轴周围的不对称产生的。但是，在第一种情况下，不对称是由于磁极上的积聚物量引起的，而在第二种情况下，这是由于强烈的磁场。我们估计具有快速旋转磁化WD的三个二元系统的GW振幅和发光度，即Ae Aquarii，Ar scorpii和Rx J0648.0-4418。我们发现，对于第一个机制，如果空间探测器BBO和Decigo的系统AE Ae Aquarii和RX J0648.0-4418可以观察到，如果它们的积聚质量为$Δm\ geQ 10^{-5} M _ {-5} M _ {\ odot} $。对于第二种机制，研究的三个系统要求WD在$ \ sim 10^{9} $ g以上具有磁场，以散发BBO检测到的GWS。我们还验证了，在这两种机制中，重力光度与这三个系统的旋转光度无关。因此，需要其他能量排放的机制来解释这些物体的束缚。
Two mechanisms of gravitational waves (GWs) emission in fast-spinning white dwarfs (WDs) are investigated: accretion of matter and magnetic deformation. In both cases, the GW emission is generated by an asymmetry around the rotation axis of the star. However, in the first case, the asymmetry is due to the amount of accreted matter on the magnetic poles, while in the second case it is due to the intense magnetic field. We have estimated the GW amplitude and luminosity for three binary systems that have a fast-spinning magnetized WD, namely, AE Aquarii, AR Scorpii and RX J0648.0-4418. We find that, for the first mechanism, the systems AE Aquarii and RX J0648.0-4418 can be observed by the space detectors BBO and DECIGO if they have an amount of accreted mass of $δm \geq 10^{-5}M_{\odot }$. For the second mechanism, the three systems studied require that the WD have a magnetic field above $\sim 10^{9}$ G to emit GWs that can be detected by BBO. We also verified that, in both mechanisms, the gravitational luminosity has an irrelevant contribution to the spindown luminosity of these three systems. Therefore, other mechanisms of energy emission are needed to explain the spindown of these objects.
