Wednesday, April 07, 2010
A mysterious planet-like object orbiting a not-quite-starlike "brown dwarf" is the most recent enigma discovered by astronomers with their ever-more powerful telescopes. Kamen Todorov, a graduate student at Penn State, and a team of co-investigators including Kevin Luhman, assistant professor of astronomy and astrophysics at Penn State, used the keen eyesight of the Hubble Space Telescope and the Gemini observatory to directly image the planet-like object. The astronomers estimate that the smaller orbiting object is five to 10 times the mass of Jupiter and that it orbits at roughly the distance from the Sun to Saturn or Uranus, which makes it planet-like, but it formed only 1 million years ago -- much faster than the time some theories predict is needed to build a planet. The team's discovery, which resulted from a survey of 32 brown dwarfs in the Taurus star-forming region, will be published in the Astrophysical Journal. (more)
Monday, December 21, 2009
Two brown dwarf-sized objects orbiting a giant old star show that planets may assemble around stars more quickly and efficiently than anyone thought possible, according to an international team of astronomers. "We have found two brown dwarf-sized masses around an ordinary star, which is very rare," said Alex Wolszczan, Evan Pugh professor of astronomy and astrophysics, Penn State and lead scientist on the project. (more)