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 HD 20782 : A Highly ‘Eccentric’ Planet is observed

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PostSubject: HD 20782 : A Highly ‘Eccentric’ Planet is observed    Sat Mar 26, 2016 12:34 am

HD 20782 : A Highly ‘Eccentric’ Planet is observed


Astronomers have observed an extra-solar planet about 117 light-years from earth that boasts the most eccentric orbit yet seen.
A team led by San Francisco State University astronomer Stephen Kane, detected a signal of reflected light from the planet known as HD 20782 — a “flash” of starlight bouncing off the eccentric planet’s atmosphere as it made its closest orbital approach to its star.
“The reflected light could tell researchers more about how the atmosphere of a planet like HD 20782 responds when it spends most of its time far away from its star, “but then has a very close approach where it’s flash-heated by the star,” Kane said in a press release.
An artist’s rendering shows the planet HD 20782, the most eccentric planet ever known, passing its star in close orbit. SF State Assistant Professor of Physics and Astronomy Stephen Kane is the lead author on a study detailing the planet’s highly irregular orbit. Credit: NASA
While the planets in our solar system have nearly circular orbits, astronomers have discovered several extrasolar planets with highly elliptical or eccentric orbits and earlier observations of HD 20782 suggested that the planet might have an extremely eccentric orbit.
HD 20782 has the most eccentric orbit known, measured at an eccentricity of .96. This means that the planet moves in a nearly flattened ellipse, traveling a long path far from its star and then making a fast and furious slingshot around the star at its closest approach.
“At the furthest point in its orbit, the planet is separated from its star by 2.5 times the distance between the sun and Earth. At its closest approach, it ventures as close as .06 of that same Earth-sun distance — much closer than Mercury orbits the sun, said Kane, an assistant professor of physics and astronomy.
“It’s around the mass of Jupiter, but it’s swinging around its star like it’s a comet.”

This graphic shows the orbit of the planet HD 20782 relative to the inner planets of our solar system. HD 20782’s orbit more closely resembles that of a comet, making it the most eccentric planet ever known.
The latest observation suggests that HD 20782 may be cloaked under a highly reflective cloud cover, much like Jupiter.
“The atmosphere of the planet [HD 20782] doesn’t have a chance to respond,” Kane said. “The time it takes to swing around the star is so quick that there isn’t time to remove all the icy materials that make the atmosphere so reflective.”
Astronomers can’t determine the exact makeup of HD 20782’s atmosphere yet, but this newest observation does suggest that it might have an atmosphere with Jupiter-like, highly reflective cloud cover.
“When we see a planet like this that is in an eccentric orbit, it can be really hard to try and explain how it got that way,” Kane explained.
“It’s kind of like looking at a murder scene, like those people who examine blood spatter patterns on the walls. You know something bad has happened, but you need to figure out what it was that caused it.”
The discovery was announced in The Astrophysical Journal.


Thanks to: http://locklip.com


  

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