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arXiv 2108.08982astro-ph.HE
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利用喷气旋进对FRB 20180916 B的16.35天周期进行验证

Reconciling the 16.35-day period of FRB 20180916B with jet precession

Hao-Yan Chen, Wei-Min Gu, Mouyuan Sun, Tong Liu, Tuan Yi

摘要:

据报道,一个重复的快速射电暴(FRB),FRB 20180916 B(以下简称FRB 180916),有16.35天的周期。这一时期可能与岁差时期有关。在本文中,我们研究了两个进动模型来解释FRB 180916的周期活动。在这两个模型中,FRB 180916的无线电发射是由旋进喷流产生的。对于第一盘驱动射流进动模型,极低的粘性参数(即,需要无量纲粘度参数$α\lesssim 10^{-8}$)来解释FRB 180916的进动,这意味着它的不可信性。对于第二个引潮力驱动的喷流进动模型,我们考虑一个由中子星/黑洞和白矮星组成的致密双星,其中白矮星充满其洛希瓣,并发生质量转移.由于圆盘和轨道平面之间的错位,白矮星的潮汐力可以驱动喷流进动。我们表明,相关的岁差周期是几天到几百天,这取决于特定的吸积速率和组件的质量。FRB 180916在极高吸积率的双星中产生的持续时间将是数千年。

英文摘要:

A repeating fast radio burst (FRB), FRB 20180916B (hereafter FRB 180916), was reported to have a 16.35-day period. This period might be related to a precession period. In this paper, we investigate two precession models to explain the periodic activity of FRB 180916. In both models, the radio emission of FRB 180916 is produced by a precessing jet. For the first disk-driven jet precession model, an extremely low viscous parameter (i.e., the dimensionless viscosity parameter $α\lesssim 10^{-8}$) is required to explain the precession of FRB 180916, which implies its implausibility. For the second tidal force-driven jet precession model, we consider a compact binary consists of a neutron star/black hole and a white dwarf; the white dwarf fills its Roche lobe and mass transfer occurs. Due to the misalignment between the disk and orbital plane, the tidal force of the white dwarf can drive jet precession. We show that the relevant precession periods are several days to hundreds of days, depending on the specific accretion rates and component masses. The duration of FRB 180916 generation in the binary with extremely high accretion rate will be several thousand years.

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