Artist’s concept of an exoplanet in the process of being terraformed. Detecting specific potent greenhouse gases on distant planets could point to advanced civilizations engaging in terraforming. Credit: Thibaut Roger/University of Bern
A terraformed planet has been artificially made hospitable for life. The gases described in the study would be detectable even at relatively low concentrations in the atmospheres of planets outside our solar system using existing technology. This could include the The five gases proposed by the researchers are used on Earth in industrial applications such as making computer chips. They include fluorinated versions of methane, ethane, and propane, along with gases made of nitrogen and fluorine or sulfur and fluorine. A newly publishedQualitative mid-infrared transmission and emission spectra of a hypothetical Earth-like planet whose climate has been modified with artificial greenhouse gases.
“With an atmosphere like Earth’s, only one out of every million molecules could be one of these gases, and it would be potentially detectable,” Schwieterman said. “That gas concentration would also be sufficient to modify the climate.”To arrive at this calculation, the researchers simulated a planet in the TRAPPIST-1 system, about 40 light-years away from Earth.
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