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Recent SETI observations at Arecibo.

J C Tarter1, R T Duquet, T A Clark

  • 1Space Sciences Laboratory, University of California, Berkeley 94720, USA.

Acta Astronautica
|May 1, 1983
PubMed
Summary
This summary is machine-generated.

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A high-resolution radio telescope searched for extraterrestrial intelligence (ETI) signals from nearby stars. While no definitive ETI signals were found, some unexplained signals warrant further investigation.

Area of Science:

  • Astronomy and Astrophysics
  • Astrobiology
  • Radio Astronomy

Background:

  • The search for extraterrestrial intelligence (SETI) is a significant area of astronomical research.
  • Previous radio telescope searches have utilized various frequencies and resolutions to detect potential technosignatures.

Purpose of the Study:

  • To conduct a high-resolution search for narrowband radio signals from nearby solar-type stars and OH masers.
  • To establish sensitivity limits for detecting artificial transmitters comparable to the Arecibo planetary radar.

Main Methods:

  • Utilized the 305-m radio telescope at Arecibo Observatory during 1980-1981.
  • Observed 210 nearby solar-type stars and 5 OH masers.
  • Analyzed bandwidths around the 21-cm HI and 18-cm OH lines with 5.5 Hz spectral resolution in dual circular polarization.

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Main Results:

  • Achieved sensitivity capable of detecting narrowband transmitters comparable to the Arecibo planetary radar.
  • Encountered a higher-than-expected number of 'false alarm' signals, exceeding Gaussian noise predictions.
  • Identified a small subset of stars exhibiting unexplained signals requiring reobservation.

Conclusions:

  • The search did not result in the definitive detection of extraterrestrial intelligence (ETI).
  • The presence of unexplained signals suggests the need for continued monitoring and follow-up observations.
  • Results are consistent with previous non-real-time SETI searches, highlighting the challenges in signal verification.