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A Search for Narrowband Technosignatures from LTT 3780 with the Allen Telescope Array and the Karl G. Jansky Very Large Array

  • Authors: Chenoa D. Tremblay, Sofia Z. Sheikh, Vishal Gajjar, Nikku Madhusudhan, Isabel Gerrard, Daniel Czech, Talon Myburgh, David E. MacMahon, Ross A. Donnachie, Andrew P. V. Siemion, Matthew Lebofsky, Alex W. Pollak

Chenoa D. Tremblay et al 2026 The Astrophysical Journal Letters 1006 .

  • Provider: AAS Journals

Caption: Figure 2.

An output plot from the ATSAT pipeline depicting two plots of a signal that was flagged for further investigation after visual inspection. The plotted signal corresponds to hit with a drift rate of 1.326 Hz s−1 and an SNR ratio of 5.45. The plots show frequency offset from a center frequency of 2400.014593 MHz, time on the y-axis, and normalized intensity (scaled to the brightest and faintest intensities in the leftmost panel) in the colorbar. The left panel is the dynamic spectrum of the “on-beam,” which was pointed toward LTT 3780, while the right panel shows the dynamic spectrum of the “off-beam,” which serves as the control. This event is definitively technological due to its narrowband nature, is either inherently changing frequency or Doppler drifting, and is fainter in the off-beam, indicating potential sky localization. This signal was determined to be RFI due to its varying SNR ratio displayed in Figure 3.

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