Beyond the Water Hole: An ALMA-Based SETI Survey at Millimeter Frequencies and the Stellar Bycatch in Beams

To the point

Louisa Mason and colleagues show that archived ALMA data can be repurposed to search for technosignatures at higher millimeter and submillimeter frequencies, finding no detectable signals but revealing that many more stars lie within telescope beams and providing a public calculator to estimate detectability, suggesting that expanding SETI to higher frequencies could broaden the search even as null results tighten limits on strong transmitters.