Astronomers from the Institute of Astrophysics atThe University of Göttingen (Germany), working with the CARMENES telescope at the Spanish observatory Kalar-Alto, reported the discovery of two exoplanets in the constellation Aries near the Tigarden star. Findings that are “only” 12.5 light years away from us (1 light year is the distance that light can cover in one calendar year, which is approximately 10 trillion kilometers), according to a scientific publication Astronomy & Astrophysics. Scientists say that these planets are as close to Earth as possible.
What is the habitable zone of stars?
"These two planets resemble the inner planetsSolar system They are located in the so-called habitable zone where water may be present, ”commented the discovery by lead author Mathias Zehmeister, an astrophysicist from the University of Göttingen.
"Given that both planets have a rocky, partly iron or water composition, they must have radii similar to those of the earth," the researchers add.
Discovered exoplanets calledTeegarden b and Teegarden c, only slightly larger than our Earth, but in general very much resemble it. Scientists say that the "Earth's similarity index" of the planet Teegarden b is 0.95, while at Teegarden c it is 0.68, which is approximately the same as Mars. Scientists use this "index" for an approximate assessment of the suitability of exoplanets and their satellites for life.
Star Tigarden was discovered by scientists back in 2003year It is a dim red dwarf, which is about a hundred thousand times lower in luminosity to our Sun, more than ten in mass and seven in diameter. Scientists report that the two exoplaents found are located in the so-called “habitable zone”, that is, in a radius from the star, where water can remain in liquid form on the surface of the planets. These aspects suggest that such planets may be habitable. However, some scientists believe that the suitability for life on planets located next to red dwarfs should not be overestimated.
In an article published in a scientific journal, scientistsreport some of the characteristics of the planets Teegarden b and Teegarden c. So, the first one makes a complete revolution around the Tigarden star in about 5 days, and the second - in 11.5 days. This is very fast, considering that even our Mercury takes 88 days to “walk” once around the Sun.
Additionally, it is reported that the temperatureTeegarden b surface ranges from zero to +50 degrees Celsius, and the average is about 28 degrees. Teegarden c is located farther from the star, so the climate is cooler and more similar to the Martian one. The average temperature on its surface is about -47 degrees Celsius.
Something like this might look like a sunset on detected exoplanets
Scientists note that they have not fully studied thissystem and are going to continue in her search for exoplanets. In addition, the researchers add that if there is intelligent life on the discovered worlds, which has received sufficient technological development, then it most likely already knows about the existence of our Earth. Scientists attribute this to the fact that the transit search method (a method for detecting exoplanets based on observations of the passage of a planet against the background of a star), by which Teegarden b and Teegarden c were discovered, could well be used by a civilization potentially living on one of these planets . Our Earth, astronomers explain, is at an ideal viewing angle from the Tigarden star system.
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