BEIJING, July 26 (Xinhuanet) -- Astronomers working with NASA's infrared Spitzer Telescope have located a swirling disk in a four-star solar system that could be home to a planet in the making.

Astronomers spotted the disk around a pair of stars in the quadruple-star system HD 98800, located 150 light-years away in the constellation TW Hydrae. The finding will be detailed in an upcoming issue of The Astrophysical Journal.

If a planet did form in the disk, its sky would be bathed in the light of four suns. One pair of suns would blaze brightly, while the other pair, gravitationally bound to the first pair, would appear as little more than faint pinpoints of light.

So-called "circumstellar" disks like the one that rings HD 98800 can be the birthplace of planets. Most disks are smooth and continuous, but the Spitzer detected a gap in the HD 98800 disk that could be evidence of one or more immature "protoplanets" carving out lanes in the dust.

"Planets are like cosmic vacuums," said study team member Elise Furlan of the NASA Astrobiology Institute at the University of California, Los Angeles. "They clear up all the dirt that is in their path around the central stars."

The researchers spied two separate belts of material in the circumstellar disk. One belt sits at 1.5 to 2 astronomical units (AU) -- the distance between the Earth and sun -- from the binary stars and likely consists of fine dust grains. The other is located about 5.9 AU away from and is probably made up of asteroids or comets. A swath of near-empty space separates the two belts, inside of which a budding planet might roam.

Alternatively, the researchers think the gap could be caused by a gravitational tug-of-war between the system's four stars. The other two stars are also doubled up, and the two binary pairs are separated by about 50 AU -- slightly more than the distance between our sun and Pluto.

"Typically, when astronomers see gaps like this in a debris disk, they suspect that a planet has cleared a path," Furlan said. "However, given the presence of the diskless pair of stars sitting 50 AU away, the inward-migrating dust particles are likely subject to complex, time-varying forces, so at this point the existence of a planet is just speculation."

(Agencies)