A Simultaneous Dual-site Technosignature Search Using International LOFAR Stations

Johnson, Owen A. and Gajjar, Vishal and Keane, Evan F. and McKenna, David J. and Giese, Charles and McKeon, Ben and Carozzi, Tobia D. and Alcaria, Cloe and Brennan, Aoife and Brzycki, Bryan and Croft, Steve and Drew, Jamie and Elkins, Richard and Gallagher, Peter T. and Kelly, Ruth and Lebofsky, Matt and MacMahon, Dave H. E. and McCauley, Joseph and de Pater, Imke and Raeside, Shauna Rose and Siemion, Andrew P. V. and Worden, S. Pete (2023) A Simultaneous Dual-site Technosignature Search Using International LOFAR Stations. The Astronomical Journal, 166 (5). p. 193. ISSN 0004-6256

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Abstract

The Search for Extraterrestrial Intelligence aims to find evidence of technosignatures, which can point toward the possible existence of technologically advanced extraterrestrial life. Radio signals similar to those engineered on Earth may be transmitted by other civilizations, motivating technosignature searches across the entire radio spectrum. In this endeavor, the low-frequency radio band has remained largely unexplored; with prior radio searches primarily above 1 GHz. In this survey at 110–190 MHz, observations of 1,631,198 targets from TESS and Gaia are reported. Observations took place simultaneously with two international stations (noninterferometric) of the Low Frequency Array in Ireland and Sweden. We can reject the presence of any Doppler drifting narrowband transmissions in the barycentric frame of reference, with equivalent isotropic radiated power of 1017 W, for 0.4 million (or 1.3 million) stellar systems at 110 (or 190) MHz. This work demonstrates the effectiveness of using multisite simultaneous observations for rejecting anthropogenic signals in the search for technosignatures.

Item Type: Article
Subjects: Science Repository > Physics and Astronomy
Depositing User: Managing Editor
Date Deposited: 10 Nov 2023 03:45
Last Modified: 10 Nov 2023 03:45
URI: http://research.manuscritpub.com/id/eprint/3484

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