Analysis of the Breakthrough Listen signal of interest blc1 with a technosignature verification framework

Analysis of the Breakthrough Listen signal of interest blc1 with a technosignature verification framework
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使用技术签名验证框架分析感兴趣的 blc1 突破性监听信号

DOI:
10.1038/s41550-021-01508-8
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发表时间:
2021
期刊:
影响因子:
14.1
通讯作者:
Lebofsky, Matt
Lebofsky, Matt
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Sheikh, Sofia Z.;Smith, Shane;Price, Danny C.;DeBoer, David;Lacki, Brian C.;Czech, Daniel J.;Croft, Steve;Gajjar, Vishal;Isaacson, Howard;Lebofsky, Matt

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搜寻地外智慧生物(SETI)的目标是通过地球以外的技术特征找到技术上有能力的生命。2019年4月29日,突破聆听SETI项目用帕克斯的“Murriyang”射电望远镜观测了比邻星。这些数据包含一个窄带信号,其特征与接近982 MHz(“blc1”)的技术特征大致一致。在这里,我们提出了一种分析潜在技术特征的程序,在人类产生的无线电干扰无处不在的背景下,我们将其应用于blc1。利用这一过程,我们发现blc1不是外星技术签名,而是与观测节奏对齐的本地时变干扰的电子漂移互调产物。我们发现了几十个无线电干扰的实例,它们在与普通时钟振荡器谐波相关的频率上具有与blc1相似的形态。这些复杂的互调产品强调了使用本工作中概述的程序对任何感兴趣的信号进行详细跟踪的必要性。
The aim of the search for extraterrestrial intelligence (SETI) is to find technologically capable life beyond Earth through their technosignatures. On 2019 April 29, the Breakthrough Listen SETI project observed Proxima Centauri with the Parkes ‘Murriyang’ radio telescope. These data contained a narrowband signal with characteristics broadly consistent with a technosignature near 982 MHz (‘blc1’). Here we present a procedure for the analysis of potential technosignatures, in the context of the ubiquity of human-generated radio interference, which we apply to blc1. Using this procedure, we find that blc1 is not an extraterrestrial technosignature, but rather an electronically drifting intermodulation product of local, time-varying interferers aligned with the observing cadence. We find dozens of instances of radio interference with similar morphologies to blc1 at frequencies harmonically related to common clock oscillators. These complex intermodulation products highlight the necessity for detailed follow-up of any signal of interest using a procedure such as the one outlined in this work.
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