论文标题
偏心中子星白矮人二进制的重力波辐射对快速无线电爆发源的周期性活动的影响
Effects of Gravitational Wave Radiation of Eccentric Neutron Star-White Dwarf Binaries on the Periodic Activity of Fast Radio Burst Sources
论文作者
论文摘要
我们通过包括重力波（GW）辐射的效果来重新审视快速无线电爆发（FRB）源的周期性活性的偏心中子星（NS） - 白矮人（WD）二进制模型。在此模型中，WD填充其在Periastron处的Roche Lobe，并从WD到NS发生传质。积聚的材料可以分散并以曲线辐射导致多种突发。因此，由于角动量的保护，WD可能会被踢开。要启动下一次传质，WD必须通过GW辐射重新填充其Roche Lobe。在这种情况下，周期性活动是否可以依赖于三个时间尺度，即轨道周期$ p _ {\ rm orb} $，时间表$ t _ {\ rm gw} $供roche lobe供卢比（Roche lobe）进行灌输，以及时间跨度$ t _ {只有两个条件$ t _ {\ rm gw} \ gtrsim p _ {\ rm orb} $和$ t _ {\ rm frag} <p _ {\ rm orb} $都满意，周期性的活动应表现出来，周期性应等于$ p _ $ p _ {\ rm或rm orb} $。本着这种精神，定期活动更有可能出现在相对较长的时期（$ p _ {\ rm orb} \ gtrsim $几天）。因此，合理的是FRB 180916和121102（仅有两个来源表现出了周期性活动，都对应于相对较长的时期。
We revisit the eccentric neutron star (NS)-white dwarf (WD) binary model for the periodic activity of fast radio burst (FRB) sources, by including the effects of gravitational wave (GW) radiation. In this model, the WD fills its Roche lobe at the periastron and mass transfer occurs from the WD to the NS. The accreted materials can be fragmented and arrive at the NS episodically, resulting in multiple bursts through curvature radiation. Consequently, the WD may be kicked away owing to the conservation of angular momentum. To initiate the next mass transfer, the WD has to refill its Roche lobe through GW radiation. In this scenario, whether the periodic activity can show up relies on three timescales, i.e., the orbital period $P_{\rm orb}$, the timescale $T_{\rm GW}$ for the Roche lobe to be refilled, and the time span $T_{\rm frag}$ for all the episodic events corresponding to each mass transfer process. Only when the two conditions $T_{\rm GW} \gtrsim P_{\rm orb}$ and $T_{\rm frag} < P_{\rm orb}$ are both satisfied, the periodic activity will manifest itself and the period should be equal to $P_{\rm orb}$. In this spirit, the periodic activity is more likely to show up for relatively long periods ($P_{\rm orb} \gtrsim$ several days). Thus, it is reasonable that FRBs 180916 and 121102, the only two sources having been claimed to manifest periodic activity, both correspond to relatively long periods.
