4 Earth-sized Planet discovered orbiting the Sun-like Star

A new study by a team of international astronomers revealed that Earth-sized planets orbiting four tau Ceti the Sun-like Star are 12 light years distant and visible to the naked eye. These planets have masses 1.7 Earth masses, which is entered in the list of the smallest planet ever detected around tau Ceti.

Two of them are Super Earth, an extrasolar planet with a mass of Earth and is brought mass ice giants of the solar system, Uranus, and Neptune is located in the habitable zone of the star. That means, their condition allows the existence of water on the surface.

Planet-this planet was detected by observing the wobble movement of tau Ceti. The techniques used are sensitive enough to detect variations in the movement of the stars as small as 30 centimeters per second.

"Through the modeling of highly sophisticated data sets from several independent observers, we can eliminate the noise because of the star's surface activity signal is very small. Signals that are generated by the gravitational pull of planets the size of Earth "said Steven Vogt, one of the authors of the journal at the same time Professor of Astronomy and Astrophysics at UC Santa Cruz. His journal with the team has now been published in the Astrophysical Journal.

According to lead author Fabo Feng of the University of Hertfordshire, UK, researchers are getting close to the limit of 10 centimeters per second is needed to detect analog Earth. "Through this analog comparison, our detection of such weak sway became a milestone in the search for analog Earth and an understanding of the Earth's sustainability," said Feng.
4 Earth-sized Planet discovered orbiting the Sun-like Star
This illustration compares the fourth planet was detected around tau Ceti (top) and the planets in our solar system (bottom)

In January 2013, the same team is also investigating the tau Ceti. Mikko Tuomi from the University of Hertfordshire is leading the efforts in developing data analysis techniques and using the star as a benchmark.

"We came up with ingenious ways to distinguish between signals caused by the planet and caused by the activity of the stars. We see how the difference in the activity of the stars at different wavelengths and use that information to separate the signal from the activity of the planet, "explained Tuomi.

With difficulty, the researchers increase the sensitivity of their techniques and were able to get rid of two signals that have been identified as 2013 team planet. "No matter how we look at the star, there are at least four Rocky planets that orbit," says Tuomi.

"We slowly learn to distinguish between the wobble caused by a planet and caused by the active surface of the star. This allows us to verify the existence of the essential two outermost potentially habitable planet in the system, "he added.

Sun-like Star is regarded as the best target in the search for habitable planets due to its similarity to the Sun. Not like small stars, such as red dwarf star Proxima Centauri and Trappist-1, they are not so Dim.

With such conditions, they would be locked simultaneously, shows the same side to the star at any time. Tau Ceti is very similar to our Sun in size and its brightness, and the two stars to host a multiple-planet system.

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