A group of astronomers from the University of Californiain Berkeley, she conducted a search for technograms (traces of developed technologies) at the star Taby (aka KIC 8462852), which shows an atypical abrupt change in brightness. According to one hypothesis, the reason for this could be some kind of alien civilization, which created a megastructure near the star to collect stellar energy. To test this assumption, scientists tried to find traces of laser technology in the light signals of a star. A preprint of an article describing their work has been published in the online library arXiv and is awaiting publication in the journal Publications of the Astronomical Society of the Pacific.
Since the opening of the star KIC 8462852 passed threeand a half years, but scientists still can not understand the cause of aperiodic changes in its brightness up to 22 percent. In the role of the suspects there were clusters of comets, and dense clouds of dust, and large asteroids, planets, astrophysical processes in the star itself. Of course, not without ideas about aliens. Some scientists have suggested that the reason for this could be a giant astro-engineering structure (for example, the Dyson sphere), being built or already erected by an extraterrestrial civilization.
The last theory decided to test the astronomers from UCBerkeley SETI, approaching the study of the star with a previously unused method. In their article, scientists report that they actually recorded several abnormal signals, but as it turned out, this is not worth it.
Researchers analyzed 177 spectraHigh resolution Tabby stars, obtained using the Automated Planet Finder telescope at Lick Observatory (USA) and covering the wavelength range from 374 to 970 nanometers. The object of the search was traces of laser radiation with a power of more than 24 megawatts, which represents the lower limit of the sensitivity of the device, taking into account the distance to the star, which is located in 1470 light years from us. The algorithm developed for this analyzed each spectrum pixel by pixel in order to find difficult-to-distinguish emission lines that could arise due to lasers.
As a result, the study revealed 58candidate signals that could be interpreted as activities of alien civilizations. Scientists did not rush to conclusions and decided to conduct further data analysis, which allowed to check whether these signals have a different explanation, including contact with cosmic ray detectors of the telescope, its own glow of the atmosphere or random variations in the stellar spectrum. As it turned out, the signals have nothing to do with laser radiation and, most likely, their source is natural phenomena.
Researchers believe that despitea negative result, their work lays the foundations for further search for alien tehnozognatur, which is also planned to be carried out with the help of the Automated Planet Finder telescope, including the framework of the project Breakthrough Listen, which is aimed at finding alien civilizations. To improve the efficiency of the search, scientists advise to analyze the spectra of various types of stars, and especially those that are similar to our Sun.
In general, so far only one sheer disappointment. Discuss the results of the study of California astronomers can be in our Telegram-chat.