Searching for extra-terrestrial intelligence through multi-wavelength observations

Abstract

The Copernican principle states that the Earth is not a special location in the Uni verse. However, so far this is the only planet known to humankind which can sup port life. This is why we have always been curious to know whether intelligent life exists in some other parts of the universe or not. Humanshavecollectively spent 60 plus years in Searching for Extraterrestrial Intelligence (SETI), without any success so far. This is known as the Fermi paradox. Many efforts have been made throughout history to resolve this paradox in sev eral ways. One such approach is to search for Dyson Spheres (Dyson, 1960), a hypothetical megastructure built by advanced extraterrestrial civilizations around their host star for harvesting its radiation energy. The aim of SETI is to search for observational signatures of Dyson spheres, which are marked by a change in the spectrum of the star. This change is expected to be in the form of waste heat from the absorbing structure (radiation emitted in the infrared) and obscuration of direct starlight. Suazo et al. (2022) had identified a tentative list of DS candidates in the Milky Way by fitting Spectral Energy Distribution (SED) based model of DS with observed data through GAIA, SDSS, DSS in the optical band and 2MASS, WISE in the infrared band.