In a nearby system detected the two most similar to Earth exoplanets
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Astronomers from the Institute of astrophysics at the University of göttingen (Germany), working with the telescope CARMENES Spanish Observatory Kalar Alto, announced the opening of the near star Teegarden in the constellation of Aries the two exoplanets. About finds, which are "only" 12.5 light-years from us (1 light year is the distance that light can overcome in one calendar year, which is approximately equal to 10 trillion kilometers), in the scientific journal Astronomy & Astrophysics. Scientists say that the planet most similar to Earth.
What is the habitable zone of stars?
"These two planets resemble the inner planets of the Solar system. They are located in the so-called habitable zone where it can be water", — commented on the opening lead author Mathias Zechmeister, an astrophysicist at the University of göttingen.
"Given the fact that both planets have rocky, partly iron or water, they should have radii similar to earth," added the researchers.
Discovered the exoplanet, dubbed Teegarden Teegarden b and c, only slightly exceed the size of our Land, but in General very much resemble her. Scientists claim that the "Earth similarity index" of the planet Teegarden b is 0.95, and Teegarden c it is 0.68, which is about as Mars. Scientists use this index to estimate the suitability of exoplanets and their moons for life.
The Star of Tegarden was discovered by scientists in 2003. It is a dim red dwarf, inferior in luminosity to our Sun is about one hundred thousand times, by mass – more than ten, and the diameter is seven. Scientists report that the two discovered ekzoplanety located in the so-called "habitable zone", i.e. within a radius from a star where on the surface of the planets water can remain in liquid form. These aspects suggest that such planets might be habitable. However, some scientists believe that the suitability for life on planets located next to the red dwarfs .
Published in the scientific journal article, scientists reported on some of the planets characteristic Teegarden Teegarden b and c. So, the first makes a complete revolution around the star of Teegarden in about 5 days and the second in 11.5 days. This is very fast considering that even our mercury takes 88 days to once "walk" around the Sun.
Additionally it is reported that the surface temperature Teegarden b varies from zero to +50 degrees Celsius, and the average is around 28 degrees. Teegarden c is located farther from the star, so the climate is cooler and it is more similar to Martian. The average temperature on its surface to be about -47 degrees Celsius.
something like this might look like a sunset on extrasolar planets discovered
Inhabited extrasolar planets
Scientists say that is still not fully studied this system and are going to continue in her search for exoplanets. In addition, the researchers add that if discovered worlds there is intelligent life, received enough technological development, it is likely already knows about the existence of our Earth. Scientists attribute this to the fact that the transit search method (a method of detecting exoplanets, based on observations of the passage of the planet on background stars), which was discovered Teegarden Teegarden b and c, could be used and civilization, potentially living on one of these planets. Our Earth, the astronomers explain, is at the perfect angle for a review of the system of the star of Thegarden.
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