HD 189733 X-ray

Autor/Urheber:

NASA/Swift/Stefan Immler

Shortlink:

https://www.dewiki.de/b/f2f72

Quelle:

Wikimedia Commons

Größe:

2250 x 2246 Pixel (215228 Bytes)

Beschreibung:

In April 2010, the researchers observed a single transit using Hubble's Space Telescope Imaging Spectrograph (STIS), but they detected no trace of the planet's atmosphere. Follow-up STIS observations in September 2011 showed a surprising reversal, with striking evidence that a plume of gas was streaming away from the exoplanet.

The researchers determined that at least 1,000 tons of gas was leaving the planet's atmosphere every second. The hydrogen atoms were racing away at speeds greater than 300,000 mph. The findings will appear in an upcoming issue of the journal Astronomy & Astrophysics.

Because X-rays and extreme ultraviolet starlight heat the planet's atmosphere and likely drive its escape, the team also monitored the star with Swift's X-ray Telescope (XRT). On Sept. 7, 2011, just eight hours before Hubble was scheduled to observe the transit, Swift was monitoring the star when it unleashed a powerful flare. It brightened by 3.6 times in X-rays, a spike occurring atop emission levels that already were greater than the sun's.

Lizenz:

Public domain

Credit:

http://www.nasa.gov/topics/universe/features/exoplanet-atmosphere.html

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