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thescienceofreality:

Strange Spiral Star —14-Billion-Miles Wide

May 07, 2012

“The discovery of a star with spiral arms in 2011 startled researchers using the Subaru telescope in Hawaii. The star, SAO 206462, is more than four hundred light years from Earth in the constellation Lupus, the wolf. Two spiral arms, acquired by the Subaru Telescope and its HiCIAO instrument, emerge from the gas-rich disk around SAO 206462.

This image is the first to show spiral arms in a circumstellar disk —some 14 billion miles across, or about twice the size of Pluto’s orbit in our own solar system.

Researchers strongly suspected that new planets might be coalescing inside the disk, which is about twice as wide as the orbit of Pluto. But when they took a closer look at SAO 206462 they found not planets, but arms. Astronomers have seen spiral arms before: they’re commonly found in pinwheel galaxies where hundreds of millions of stars spiral together around a common core. Finding a clear case of spiral arms around an individual star, however, is unprecedented, The arms might be a sign that planets are forming within the disk.
“Detailed computer simulations have shown us that the gravitational pull of a planet inside a circumstellar disk can perturb gas and dust, creating spiral arms,” said Carol Grady, an astronomer with Eureka Scientific, Inc., who is based at NASA’s Goddard Space Flight Center. “Now, for the first time, we’re seeing these dynamical features.”

Theoretical models show that a single embedded planet may produce a spiral arm on each side of a disk. The structures around SAO 206462, however, do not form a matched pair, suggesting the presence of two unseen worlds, one for each arm.”

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egonkey:

Thomas Hooper

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