Geng Jinjun, Li Bing, Huang Yongfeng
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, China.
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
Innovation (Camb). 2021 Aug 12;2(4):100152. doi: 10.1016/j.xinn.2021.100152. eCollection 2021 Nov 28.
Strange stars (SSs) are compact objects made of deconfined quarks. It is hard to distinguish SSs from neutron stars as a thin crust composed of normal hadronic matter may exist and obscure the whole surface of the SS. Here we suggest that the intriguing repeating fast radio bursts (FRBs) are produced by the intermittent fractional collapses of the crust of an SS induced by refilling of materials accreted from its low-mass companion. The periodic/sporadic/clustered temporal behaviors of FRBs could be well understood in our scenario. Especially, the periodicity is attributed to the modulation of accretion rate through the disk instabilities. To account for a ~16-day periodicity of the repeating FRB source of 180916.J0158+65, a Shakura-Sunyaev disk with a viscosity parameter of 0.004 and an accretion rate of 3 × 10 g s is invoked. Our scenario, if favored by future observations, will serve as indirect evidence for the strange quark matter hypothesis.
奇异星（SSs）是由解禁夸克构成的致密天体。由于可能存在由正常强子物质组成的薄壳，它会遮蔽奇异星的整个表面，所以很难将奇异星与中子星区分开来。在此我们提出，有趣的重复快速射电暴（FRBs）是由奇异星地壳间歇性的部分坍缩产生的，这种坍缩是由从其低质量伴星吸积的物质重新填充所引发的。在我们的设想中，快速射电暴的周期性/偶发性/成簇的时间行为能够得到很好的理解。特别地，周期性归因于通过盘不稳定性对吸积率的调制。为了解释重复快速射电暴源180916.J0158 + 65约16天的周期性，我们引入了一个 Shakura - Sunyaev盘，其粘滞参数为0.004，吸积率为3×10克/秒。如果我们的设想得到未来观测的支持，它将作为奇异夸克物质假说的间接证据。
