Nondetection of Narrowband Radio Technosignatures from LHS 1140 b at 1–12 GHz

by Keith CowingAugust 1, 2026August 1, 2026

Distribution of hits (circles) and events (stars) over frequency and drift rate. The marker size gives the true S/N of the signal (i.e., after correcting for the factor of 3.3). The gray-shaded regions show ranges not sampled, including narrow notch filter regions at L and S bands. -- Research Notes of the AAS

[Research Notes of the AAS] LHS 1140b, a rocky exoplanet in its host star’s habitable zone, was recently shown to have an escaping helium atmosphere.

We present a search for narrowband radio technosignatures in archival Breakthrough Listen observations toward the LHS 1140 system using the 100 m Robert C. Byrd Green Bank Telescope at 1–12 GHz.

We report a nondetection of candidate signals above 300 GW.

Nondetection of Narrowband Radio Technosignatures from LHS 1140 b at 1–12 GHz, Research Notes of the AAS, (open access)

Astrobiology,

Keith Cowing

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp... More by Keith Cowing