Wednesday, December 21, 2011

Newly found planets are 'roasted remains'

The day after the announcement of the discovery of the first Earth-size planet ever detected outside our solar system, scientists have confirmed that the two worlds is even smaller.

There is something very unusual these objects, however.

It turns out that they are roasted in the planets, the use of their time inside the outer layers of the star.

Scientists tell Nature magazine that these worlds are therefore likely to be much higher than in the past.

Again, these worlds are identified on the basis of NASA Kepler telescope, which was launched in 2009 with the specific purpose of hunting down small planets.

This latest haul was discovered in a well-known knowledge about the letter 05,807,616th They have diameters that are just 76% and 87% of the Earth.

What is interesting about this letter is that it is the former red giant, so-called "hot subdwarf B".

Red giant star refers to the late stage of life when it has begun to exhaust its hydrogen fuel.
Deep spiral

Star in this phase of its outer layers expand and cool, this is a glow for more reddish color. Our own Sun will go through this phase in a few billion years.

But the consequence is that all the planets that orbit relatively close to the star happens to be engulfed in the expanding envelope of gas is likely.

It happens to Earth and it seems to have been the case with the newly discovered planet, called koi, koi, 55.01 and 55.02, whip around their host star in just a few hours.
Artist impression of Kepler (STSCI) Kepler telescope was launched in 2009

Knowledge of their existence so close to the tell-tale is 05807616, which must have happened to them.

Going into the expanding outer layers of the star would seriously harm the global, ripping away all the gaseous or liquid material.

Which team will provide its own data is probably just a remnant cores that were once a giant gas planet not unlike our Jupiter.

"The details are, of course, all this would require a confident and dedicated to modeling but we expect that tidal dissipation due to friction and engulfed planets have spiraled even deeper inside the star," said study lead author Stephane Charpinet, University of Toulouse in France.

"In the process of its variable or evaporated layers are probably pulled off by rubbing.

"At the same time, the wrapper could be due to further expand and accelerate its rotation due to the inward motion of the planets.

"Then, the system is stabilized by a common envelope configuration, where the planets are settled in stable orbits inside the red giant," he told BBC News.

"The red giant envelope was eventually sent out almost entirely due to increased mass loss, which leads to the formation of hot subdwarf B star, as we have seen."
The graphic shows the evolution of a star

The discovery was made, however, scientists were engaged in asteroseismology - practice learning pulsations would assess their internal structure. This is similar to seismology to explore the interior of the stone caused by the oscillations of the Earth quakes.

But as they did, and his colleagues noticed Charpinet characteristic dip in the light from each of the Knowledge 05807616 5.76 and 8.23 ​​hours - the result of two objects when viewed through the front due to Kepler.

What seems remarkable is that the planets were not completely destroyed by the process of sinking. But Dr. Charpinet said that the large iron cores of giant planets could be placed in the environment for millions of years.

"Iron is certainly much more difficult to evaporate the liquid or gaseous layers made of the volatile elements that make envelopes big giant planets," he explained.

"Moreover, the dense cores are quite closely related to their own gravity. Then, it takes more time to fully evaporate from them.

"In fact, our discovery suggests that these cores could survive long enough for the red giant phase, and later converted into a very hot stars."

On Tuesday, a separate team announced that they had used the Kepler planet discovered with a diameter of just 87% and 103% of the Earth. They go to the record books as the first truly Earth-size planet found outside our solar system.

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Article Source:- http://www.bbc.co.uk/news/science-environment-16279016

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