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The Breakthrough Listen Search for Intelligent Life: 1.1–1.9 GHz Observations of 692 Nearby Stars
- Source :
- The Astrophysical Journal, 849, 2, pp. 1-13, The Astrophysical Journal, 849, 1-13
- Publication Year :
- 2017
-
Abstract
- We report on a search for engineered signals from a sample of 692 nearby stars using the Robert C. Byrd Green Bank Telescope, undertaken as part of the $Breakthrough~Listen~Initiative$ search for extraterrestrial intelligence. Observations were made over 1.1$-$1.9 GHz (L band), with three sets of five-minute observations of the 692 primary targets, interspersed with five-minute observations of secondary targets. By comparing the "ON" and "OFF" observations we are able to identify terrestrial interference and place limits on the presence of engineered signals from putative extraterrestrial civilizations inhabiting the environs of the target stars. During the analysis, eleven events passed our thresholding algorithm, but a detailed analysis of their properties indicates they are consistent with known examples of anthropogenic radio frequency interference. We conclude that, at the time of our observations, none of the observed systems host high-duty-cycle radio transmitters emitting between 1.1 and 1.9 GHz with an Equivalent Isotropic Radiated Power of $\sim10^{13}$ W, which is readily achievable by our own civilization. Our results suggest that fewer than $\sim$ 0.1$\%$ of the stellar systems within 50 pc possess the type of transmitters searched in this survey.<br />Comment: ApJ. 13 pages, 7 figures, 4 tables. This version has a typo correction to Eq. (4)
- Subjects :
- Physics
Earth and Planetary Astrophysics (astro-ph.EP)
L band
010504 meteorology & atmospheric sciences
Astronomy
Transmitter
Extraterrestrial intelligence
Green Bank Telescope
FOS: Physical sciences
Astronomy and Astrophysics
Effective radiated power
01 natural sciences
Stars
Space and Planetary Science
Extraterrestrial life
0103 physical sciences
010303 astronomy & astrophysics
GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries)
Search for extraterrestrial intelligence
0105 earth and related environmental sciences
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- ISSN :
- 0004637X
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal, 849, 2, pp. 1-13, The Astrophysical Journal, 849, 1-13
- Accession number :
- edsair.doi.dedup.....c970a13b55a85e26faec67b5d2441921