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Tue Jul 30, 2013, 12:30 PM

NASA's Chandra Sees Eclipsing Planet in X-rays for First Time

RELEASE: 13-237

NASA's Chandra Sees Eclipsing Planet in X-rays for First Time

For the first time since exoplanets, or planets around stars other than the sun, were discovered almost 20 years ago, X-ray observations have detected an exoplanet passing in front of its parent star.

An advantageous alignment of a planet and its parent star in the system HD 189733, which is 63 light-years from Earth, enabled NASA’s Chandra X-ray Observatory and the European Space Agency’s XMM Newton Observatory to observe a dip in X-ray intensity as the planet transited the star.

"Thousands of planet candidates have been seen to transit in only optical light," said Katja Poppenhaeger of Harvard-Smithsonian Center for Astrophysics (CfA) in Cambridge, Mass., who led a new study to be published in the Aug. 10 edition of The Astrophysical Journal. "Finally being able to study one in X-rays is important because it reveals new information about the properties of an exoplanet."

The team used Chandra to observe six transits and data from XMM Newton observations of one.

The planet, known as HD 189733b, is a hot Jupiter, meaning it is similar in size to Jupiter in our solar system but in very close orbit around its star. HD 189733b is more than 30 times closer to its star than Earth is to the sun. It orbits the star once every 2.2 days.

HD 189733b is the closest hot Jupiter to Earth, which makes it a prime target for astronomers who want to learn more about this type of exoplanet and the atmosphere around it. They have used NASA's Kepler space telescope to study it at optical wavelengths, and NASA's Hubble Space Telescope to confirm it is blue in color as a result of the preferential scattering of blue light by silicate particles in its atmosphere.


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http://chandra.harvard.edu/press/13_releases/press_072913.html

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Reply NASA's Chandra Sees Eclipsing Planet in X-rays for First Time (Original post)
n2doc Jul 2013 OP
longship Jul 2013 #1
VWolf Jul 2013 #2
lastlib Jul 2013 #3
VWolf Jul 2013 #4

Response to n2doc (Original post)

Tue Jul 30, 2013, 01:01 PM

1. And Kepler has over 3,200 planet candidates yet to confirm.

I guess we get to check off one of them now.

Kepler may now be broken, but it may take many years to verify what it's found.

Cool, awesome science.
R&K

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Response to n2doc (Original post)

Tue Jul 30, 2013, 01:19 PM

2. Wow, so if I was born on HD 189733b,

I'd be about 7,800 years old. Nice.

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Response to VWolf (Reply #2)

Tue Jul 30, 2013, 02:15 PM

3. ...and probably extra crispy....!

the stellar radiation on a planet like that would probably have turned you into a pile of charcoal before you were 100!

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Response to lastlib (Reply #3)

Tue Jul 30, 2013, 03:41 PM

4. Meh. Details. n/t

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