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10 April 2014 11:44 am ,
Vol. 344 ,
The Pyrenean ibex, an impressive mountain goat that lived in the central Pyrenees in Spain, went extinct in 2000. But a...
Tight budgets are forcing NASA to consider turning off one or more planetary science projects that have completed their...
Ebola is not a stranger to West Africa—an outbreak in the 1990s killed chimpanzees and sickened one researcher. But the...
In an as-yet-unpublished report, an international panel of geoscientists has concluded that a pair of deadly...
Tropical disease experts tried and failed before to eradicate yaws, a rare disfiguring disease of poor countries. Now,...
Since 2002, researchers have reported that agricultural communities in the hot and humid Pacific Coast of Central...
Balkan endemic kidney disease surfaced in the 1950s and for decades defied attempts to finger the cause. It occurred...
- 10 April 2014 11:44 am , Vol. 344 , #6180
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ScienceShot: Hot Jupiters Are Loners
7 May 2012 3:00 pm
In October 1995 when astronomers announced the first planet orbiting another star like the sun, Ted Koppel was so impressed he featured the discovery on Nightline. The new world was unlike any ever seen: a "hot Jupiter" bearing roughly the same mass as the sun's largest planet but lying so close to its star that it revolved every 4.23 days. However, Koppel may be less jazzed about a new announcement. In a study published online today in the Proceedings of the National Academy of Sciences, astronomers analyzing 63 hot Jupiters (depicted above) detected by NASA's Kepler spacecraft have found no planets comparable in size to Earth orbiting nearby. In contrast, many hot Neptunes—close-in giant worlds with roughly 5% of Jupiter's mass—do have planetary neighbors. The findings may mean that hot Jupiters assume their peculiar orbits after far-off giant planets kick them close to their suns. As the hot Jupiter dashes inward, its gravity ejects any smaller planets near the star, both explaining the absence of close planetary neighbors and suggesting that solar systems with hot Jupiters are unlikely to host life-bearing worlds resembling Earth.
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