No credible periodic artificial signals were detected in the first lunar farside SETI observations using Chang'E-4 low-frequency radio spectrometer data.
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9 Pith papers cite this work. Polarity classification is still indexing.
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A dual-burst geometrical prescription is introduced that defines a sky ring locus for concurrent signaling in technosignature searches using two cosmological transients, independent of all distance information.
No extraterrestrial technosignatures detected in an all-sky ultra-narrowband imaging survey at 50-86 MHz with OVRO-LWA, achieving ~100 Jy sensitivity and EIRP limits of 10^14 W at 10 pc.
A Bayesian search calibrated on 3,493 meteorite analyses finds strong evidence for a siderophile-enriched processed template in only a small fraction of 697 polluted white dwarf records, with posterior medians of 0.011 and 0.041.
A wavelet-integrated pipeline with MSWNet recovers prior narrowband events and yields new veto-ready candidates in FAST observations of 33 exoplanet systems.
First observational test of the hybrid ring technosignature strategy with GRB 221009A and TESS data identifies no credible signals but validates the method's feasibility for future searches.
A tiered observational strategy is outlined to identify planetary-scale broadband radio technosignatures (BRaTs) from advanced civilizations up to 100 pc away using multi-parameter diagnostics to separate them from natural signals.
Climate states on exoplanets with the same atmospheric composition create different reflectance spectra, changing the detectability of atmospheric features and biosignatures, with seasonal variations on high-obliquity worlds adding time-dependent signals.
Upper limits on the cosmic abundance of Kardashev Type III radio-broadcasting populations are set at less than one per 10^17 stars using radio source counts and commensal SETI field limits.
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Artificial Broadcasts as Galactic Populations: III. Constraints on Radio Broadcasts from the Cosmic Population of Inhabited Galaxies
Upper limits on the cosmic abundance of Kardashev Type III radio-broadcasting populations are set at less than one per 10^17 stars using radio source counts and commensal SETI field limits.