VLA与高频SETI：拓展地外生命搜寻
The VLA and High-Frequency SETI: Expanding the Search for Life
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中文总结 AI 辅助
本研究依托VLA的COSMIC系统，运用泰勒树去色散算法搜寻高频窄带漂移技术信号，扩展了SETI的高频搜寻范围。
中文摘要 AI 辅助
共生开源多模式干涉仪集群（COSMIC）运行着利用卡尔·G·扬基甚大天线阵（VLA）搜寻宇宙中其他地方的技术信号（“技术信号”）的软件，具体搜寻因多普勒运动随时间在频率上漂移的窄带信号。尽管这是从VLA的COSMIC系统发表的第一项高频技术信号研究，但它紧跟一名本科研究实习生完成的前期工作。在VLA的视场内，COSMIC上的软件会生成指向盖亚星表中可能包含系外行星的恒星的相干波束。记录的结果遵循实时软件流水线，并被检查是否存在技术信号。使用泰勒树去色散算法寻找窄带漂移信号，对每个记录的波束（相干和非相干）搜寻漂移率幅度高达±50Hz/s的信号，所有检测结果都作为“命中”存储，并存储相关数据片段以供后续研究。本研究的目的是通过审查2024年2月至今的数据来扩展高频搜寻，研究先前实施的和新的滤波器对找到候选信号的影响。在流水线的最后阶段，我们的目标是通过成像从空间上研究这些候选信号，因此这些观测探测了在之前的SETI巡天中相对较少覆盖的频率和信号参数空间区域。
英文摘要
The Commensal Open-Source Multimode Interferometer Cluster (COSMIC) runs software that searches for technologies elsewhere in the Universe ("technosignatures") using the Karl G. Jansky Very Large Array (VLA). Specifically, it searches for narrowband signals that drift in frequency over time as a result of Doppler motions. Although this is the first study of high-frequency technosignatures that has been published from the COSMIC system on the VLA, it follows closely on previous work completed by an undergraduate research intern. Within the field of view of the VLA, the software on COSMIC creates coherent beams directed toward stars that may contain exoplanets from the Gaia catalogue. The recorded results follow a real-time software pipeline and are examined for technosignatures. Using a Taylor-Tree De-Dispersion algorithm to find narrow-band drifting signals, each recorded beam (coherent and incoherent) is searched for signals with a drift-rate with magnitudes up to $\pm$50Hz/s. All detections are stored as "hits" with the relevant snippet of data stored for posterity. The purpose of this work is to extend the high-frequency search by reviewing data from February 2024 to the present. Our study examines the impact of previously implemented and novel filters to find a selection of candidate signals. At the final stage of the pipeline, our objective is to study these resultant candidate signals spatially through imaging. The observations therefore probe regions of frequency and signal parameter space that have received comparatively limited coverage in previous SETI surveys.
