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arXiv 2408.11536astro-ph.HEastro-ph.SR
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在一个白矮星双星系统中以轨道周期出现的零星射电脉冲

Sporadic radio pulses from a white dwarf binary at the orbital period

I. de Ruiter, K. M. Rajwade, C. G. Bassa, A. Rowlinson, R. A. M. J. Wijers, C. D. Kilpatrick, G. Stefansson, J. R. Callingham, J. W. T. Hessels, T. E. Clarke, W… 展开作者

I. de Ruiter, K. M. Rajwade, C. G. Bassa, A. Rowlinson, R. A. M. J. Wijers, C. D. Kilpatrick, G. Stefansson, J. R. Callingham, J. W. T. Hessels, T. E. Clarke, W. Peters, R. A. D. Wijnands, T. W. Shimwell, S. ter Veen, V. Morello, G. R. Zeimann, S. Mahadevan

AI总结:

研究发现瞬变射电源 ILT J1101+5521 是M型矮星—白矮星双星,125.5分钟脉冲周期等于轨道周期,表明长周期射电瞬变可由双星轨道运动调制磁相互作用辐射产生。

摘要:

近期观测揭示了罕见且此前未知的宇宙射电波闪光,其持续时间从数毫秒到数分钟不等,并具有数分钟至一小时的周期性。这些瞬变射电信号必定源自银河系内的天体,并来自天体物理等离子体中的相干辐射过程。理论认为,它们产生于白矮星或中子星周围极端且高度磁化的环境。然而,这些信号的天体物理起源仍存在争议,可能需要多种前身星模型来解释其多样性质。在此,我们报告发现了一个瞬变射电源 ILT J1101+5521,其约一分钟长的脉冲以125.5分钟的周期性到达。我们发现 ILT J1101+5521 是一个M型矮星—白矮星双星系统,其轨道周期与射电脉冲周期相符,而这些脉冲是在两颗恒星处于合相时被观测到的。ILT J1101+5521 的双星性质证实,某些长周期射电瞬变源源于轨道运动对所观测辐射的调制,而非来自一颗孤立的旋转恒星。我们得出结论,ILT J1101+5521 很可能是一个激变变星中的偏振星系统,其中磁相互作用已使白矮星的自转周期与轨道周期同步。两颗恒星之间的磁相互作用和等离子体交换在理论上可产生零星射电辐射,这使 ILT J1101+5521 成为此类机制的一个潜在低质量类似体。

英文摘要:

Recent observations have revealed rare, previously unknown flashes of cosmic radio waves lasting from milliseconds to minutes, and with periodicity of minutes to an hour. These transient radio signals must originate from sources in the Milky Way, and from coherent emission processes in astrophysical plasma. They are theorized to be produced in the extreme and highly magnetised environments around white dwarfs or neutron stars. However, the astrophysical origin of these signals remains contested, and multiple progenitor models may be needed to explain their diverse properties. Here we present the discovery of a transient radio source, ILT J1101+5521, whose roughly minute-long pulses arrive with a periodicity of 125.5 minutes. We find that ILT J1101+5521 is an M dwarf -- white dwarf binary system with an orbital period that matches the period of the radio pulses, which are observed when the two stars are in conjunction. The binary nature of ILT J1101+5521 establishes that some long-period radio transients originate from orbital motion modulating the observed emission, as opposed to an isolated rotating star. We conclude that ILT J1101+5521 is likely a polar system where magnetic interaction has synchronised the rotational and orbital periods of the white dwarf. Magnetic interaction and plasma exchange between two stars has been theorized to generate sporadic radio emission, making ILT J1101+5521 a potential low-mass analogue to such mechanisms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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