- News Home
17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- About Us
Smallest Distant Planets Yet Detected
29 March 2000 7:00 pm
WASHINGTON, D.C.--The planet hunters are at it again, and this time, they've bagged two Saturn-sized worlds. The two planets orbiting distant stars are the smallest extrasolar planets yet found, and they're the first proof that scientists would be able to spot a solar system with a geometry like our own.
In the past 5 years, astronomers have detected about 30 planets beyond our sun's neighborhood. No one has seen these distant planets directly, but they are revealed by their gravity: The tug of orbiting planets creates telltale wobbles in a star's motion. Smaller planets exert less power over their suns, so it has been all but impossible to find a planet very distant from its sun or smaller than about half the mass of Jupiter--until recently.
Astronomers Geoff Marcy of the University of California, Berkeley, and Paul Butler of the Carnegie Institution of Washington, D.C., have found about two-thirds of all the extrasolar planets to date. Now, they have tripled the precision of their spectrometer and detected two planets roughly one-third the size of Jupiter, they announced today at a NASA press briefing. The first planet orbits the star HD43675, located 109 light-years away in the constellation Monoceros; the second orbits the star 79 Ceti, 117 light-years away in the constellation Cetus. The detection of such small planets means that Marcy and Butler's equipment is sensitive enough to detect a twin of our solar system, one with a Jupiter-mass planet fairly distant from its star.
Carnegie Institution astrophysicist Alan Boss believes that the detection of these two planets suggests that there are a whole range of planetary masses in alien systems--from rare super-Jupiters to fairly common sub-Saturns and below. "What we're seeing is really just the tip of the iceberg," he says. NASA space scientist Anne Kinney concurs: "This is brand new; we're going to learn what kind of animals are in that zoo."