“We thought we would have to search vast distances to find an Earth-like planet. Now we realize another Earth is probably in our own backyard, waiting to be spotted,” said Courtney Dressing of the Harvard-Smithsonian Center for Astrophysics
(CfA). Six percent of red-dwarf stars have habitable, Earth-sized
planets, astronomers at the Harvard-Smithsonian Center for Astrophysics
(CfA) have found. Red dwarfs are the most common stars in our galaxy;
about 75 percent of the closest stars are red dwarfs. The closest
Earth-like planet could be just 13 light-years away, Harvard astronomer
and lead author Courtney Dressing calculated.
Red dwarf stars
are smaller, cooler, and fainter than our Sun. An average red dwarf is
only one-third as large and one-thousandth as bright as the Sun.
The cFa team culled the Kepler
catalog of 158,000 target stars to identify all the red dwarfs, then
reanalyzed those stars to calculate more accurate sizes and
temperatures. They found that almost all of those stars were smaller and
cooler than previously thought.
Locating nearby Earth-like worlds may require a dedicated small space
telescope, or a large network of ground-based telescopes. Follow-up
studies with instruments like the Giant Magellan Telescope and James Webb Space Telescope
could tell us whether any warm, transiting planets have an atmosphere
and further probe its chemistry. Since red dwarf stars live much longer
than Sun-like stars, this discovery raises the interesting possibility
that life on such a planet would be much older and more evolved than
life on Earth.
Courtney D. Dressing, David Charbonneau, The occurrence rate of small planets around small stars, The Astrophysical Journal, 2013, in press
Source: Daily Galaxy via Harvard-Smithsonian Center for Astrophysics
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