论文标题
具有不同变形结构的新生磁铁的重力波演化
Gravitational-wave evolution of newborn magnetars with different deformed structure
论文作者
论文摘要
弱和连续的重力波（GW）辐射可以由具有变形结构的新生磁铁产生，并有望在不久的将来由爱因斯坦望远镜检测到。在这项工作中，我们假设新生磁体的变形结构不是由单个机制引起的，而是由多个时间变化的四极矩（例如磁性诱导的变形，恒星诱导的椭圆率和积聚柱诱导的变形型）引起的。磁铁通过积聚，磁偶极辐射和GW辐射失去其角动量。在这种情况下，我们通过考虑上述三个变形来计算新生磁铁的GW的演变。我们发现，GW的演化取决于磁体的物理参数（例如，周期和表面磁场），绝热指数以及多型磁能的比例分为总磁能。通常，如果磁铁的表面磁场很大，则来自磁性变形的GW辐射是主导的，但是如果所有其他磁盘参数保持较大，则磁性星形的GW辐射效率更高。我们还发现，GW辐射对状态的不同磁力方程不太敏感。
Weak and continuous gravitational-wave (GW) radiation can be produced by newborn magnetars with deformed structure and is expected to be detected by the Einstein telescope in the near future. In this work we assume that the deformed structure of a nascent magnetar is not caused by a single mechanism but by multiple time-varying quadrupole moments such as those present in magnetically induced deformation, starquake-induced ellipticity, and accretion column-induced deformation. The magnetar loses its angular momentum through accretion, magnetic dipole radiation, and GW radiation. Within this scenario, we calculate the evolution of GWs from a newborn magnetar by considering the above three deformations. We find that the GW evolution depends on the physical parameters of the magnetar (e.g., period and surface magnetic field), the adiabatic index, and the fraction of poloidal magnetic energy to the total magnetic energy. In general the GW radiation from a magnetically induced deformation is dominant if the surface magnetic field of the magnetar is large, but the GW radiation from magnetar starquakes is more efficient when there is a larger adiabatic index if all other magnetar parameters remain the same. We also find that the GW radiation is not very sensitive to different magnetar equations of state.
