Found the remains of fried giant planets


Astronomers were able to use a telescope "Kepler" to discover two planets scorched dying star out of their system. Star of burned gas shell planets and left only their charred stone core.

Astronomer Elizabeth Greene, who participated in the opening of ’roasted’ planets, explained that when the sun is, swelling, turn into a red giant, the outer solar envelope just swallow our planet. After staying in the fiery chains about a billion years, the Earth will evaporate. To survive in such conditions can only giant planets such as Saturn and Jupiter.

Charred planets astronomers have found in the dying star KIC 05807616, which is located at a distance of 3,850 light-years from Earth. This star belongs to the class of hot subdwarfs. Not very big, but very hot, she appeared in "failure" in the traditional development cycle of large red star and the initial stage of the death of ordinary stars. Dying, that of a normal star and ends with hydrogen fuel, it goes to another type of fuel - helium, which consists of its core. The rate of reactions in the outer layers of hydrogen sharply increased and the temperature increases, and the outer layers of the sun grow over long distances. Sometimes just the star loses its hydrogen envelope before reaching the red giant phase, becoming then already in hot subdwarf as the star KIC 05807616.

Discovered by astronomers star belongs to the category of another variable stars. On a periodic basis, it then becomes brighter, then fades again. This property allows professionals to more easily find the planet near the star.

The astronomers observed the star KIC 05807616 for six months, until fixed, failures in the periodic oscillation of sunshine every 8.2 and 5.8 hours. In the language of astronomy, "troublemakers" cycle could only be a planet.

Detected objects assigned indices KOI 55.02 and KOI 55.01. Speed planetary transits across the disk of "dying" star says their orbit is very close proximity to the stars. Planet KOI 55.01 can be removed from the star at 0.006 astronomical units, and KOI 55.02 - at 0.0076. The radius of the first planet around can be equal to 0.76 Earth radii, and its weight will be about 0.44 Earth mass. The radius of the planet a little more than a second and is about 0.86 Earth radius and the mass is equal to about 0.65 Earth mass.

Scientists suggest that the planet after the star of "explosion" became molten magma balls that have the sunny side of the surface temperature reaches 9000 degrees Kelvin, and on the night side of 1800 degrees.

Researchers wondering how the planets are generally able to survive in their orbits after the expansion of the red giant. The star was bound to destroy them. Perhaps this is not the full-fledged planet, and their remains, which are "blown away" by a more distant orbit. The expansion of the star of "ate" with the gaseous envelope of the planets and left only the hard core. Thus, the scientists were able to discover a planet or chthonic core of the gas giant, stripped of its gaseous envelope. The title of the chthonic planets to the latest discovery claim only two of the planet Kepler-10b and CoRoT-7b. However, they very likely could be the usual large Earth-like rocky planets.

The news produced Oksana Skripko

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