Optical search for extraterrestrial intelligence with Air Cerenkov telescopes.

Area of Science:

• Astronomy
• Astrophysics
• SETI (Search for Extraterrestrial Intelligence)

Background:

• Current methods for detecting extraterrestrial intelligence often focus on radio signals.
• Optical transient signals are a largely unexplored avenue in SETI research.

Purpose of the Study:

• To propose and evaluate the feasibility of using large Air Cherenkov telescopes (ACTs) for detecting optical, pulsed signals from extraterrestrial intelligence.
• To explore the potential of ACTs in identifying technosignatures.

Main Methods:

• Utilizing the photon-collecting capabilities of large Air Cherenkov telescopes to detect nanosecond-scale optical pulses.
• Monitoring fields of view up to 10 square degrees, observing multiple stars simultaneously.
• Employing precise timing of pulse arrivals, using Earth's diameter as a baseline, to detect exoplanet orbital motion.

Main Results:

• ACTs can detect tens of photons from a nanosecond pulse with isotropic equivalent power of tens of solar luminosities at 100 pc.
• The proposed method allows for the simultaneous monitoring of 10-100 stars for pulses of approximately 6th magnitude or brighter.
• Orbital motion of exoplanets could be detectable through variations in pulse arrival times.

Conclusions:

• Large Air Cherenkov telescopes offer a novel and powerful tool for the Search for Extraterrestrial Intelligence (SETI).
• This approach expands the search for technosignatures beyond traditional radio frequencies.
• The detection of pulsed optical signals could provide evidence of advanced extraterrestrial civilizations and their planetary systems.