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News Release 4 of 37

November 30, 2005 12:00 PM (EST)

News Release Number: STScI-2005-31

Planet-Sized Brown Dwarf May Yield Smallest Known Solar System


Image: Itsy Bitsy Solar System

Itsy Bitsy Solar SystemSTScI-PRC2005-31 Artist's Concept

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This artist's conception compares a hypothetical solar system centered around a tiny "sun" (top) to a known solar system centered around a star, called 55 Cancri, which is about the same size as our sun. NASA's Spitzer and Hubble Space Telescopes and two telescopes in the Chilean Andes, the Blanco telescope of the Cerro Tololo Inter-American Observatory and the Gemini South telescope, discovered the beginnings of such a miniature solar system 500 light-years away in the Chamaeleon constellation.

The tiny system consists of an unusually small "failed" star, or brown dwarf called Cha 110913-773444, and a surrounding disk of gas and dust that might one day form planets. At a mass of only eight times that of Jupiter, the brown dwarf is actually smaller than several known extrasolar planets. The largest planet in the 55 Cancri system is about four Jupiter masses.

Astronomers speculate that the disk around Cha 110913-773444 might have enough mass to make a small gas giant and a few Earth-sized rocky planets, as depicted here around the little brown dwarf.

For more information, please contact:

Kevin Luhman
Penn State University
Phone: 814-863-4957

Barbara K. Kennedy (PIO)
Penn State University
Phone: 814-863-4682

David A. Aguilar (PIO)
Harvard-Smithsonian Center for Astrophysics
Phone: 617-495-7462

Christine Pulliam (PIO)
Harvard-Smithsonian Center for Astrophysics
Phone: 617-495-7463, Fax: 617-495-7016

Whitney Clavin
JPL/Spitzer Science Center
Phone: 818-354-4673

Image Type: Artwork

Credit: NASA/JPL-Caltech