вторник, 30 июля 2013 г.

First time scientists have considered an exoplanet in X-rays

Scientists from the United States was the first to consider located outside the solar system planet in X-rays.

Until now, similar observations were made solely in the optical domain, but the Chandra telescope and the European XMM Newton telescope has allowed astronomers to make the next step in the study of extrasolar planets.

"Thousands of candidate planets were discovered through transits in visible light. Fact that we were finally able to see one in X-rays, it is important because it gives new information about the properties of exoplanets," - said Kate Poppenheger of the Harvard-Smithsonian Center for Astrophysics.

Scientists monitored the hot Jupiter HD 189733b - Opened in 2005, the gas giant, which is 1.14 times larger than Jupiter, and almost as many times heavier than him. It orbits the star HD 189733 A, whose size and weight is approximately 80% of the sun.

In this case, the fall of the star's brightness in X-rays proved stronger than in the visible range. In optics brightness dropped by 2.4%, the Chandra and XMM Newton X-ray brightness recorded a decline of 6% -8%.
"We interpret this as a result of the impact of the outer atmosphere of the planet, which is transparent to visible light, but dense enough to hold up X-rays" - the scientists conclude.

As previously reported, the company soon Orbital Sciences Corporation for NASA to build a telescope-hunter exoplanets TESS. Probe TESS (Transiting Exoplanet Survey Satellite) will look for planets outside our solar system transit method - fixing small oscillations of the brightness of stars associated with the passage of the planet on the background brightness of the disk. The main task will be to find extrasolar planets TESS potentially suitable for the existence of life, the nearest stars.




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