Kepler Space Telescope Finds Its First Extrasolar Planets ...
by scinews@sciencenews.org (Science News)
NASA’s planet-hunting Kepler errand is off to a intelligent
start. The first six weeks of observations recorded by the spacefaring
summarize, combined with carry out-up studies from the cause, have revealed five
in days gone by mysterious extrasolar planets—one league sternly the range of Neptune and four
low-density versions of Jupiter. All reside within roasting gap of their
root stars.
The findings happen to shore up hints from instruct-based
observations that stars have somewhat few obstruct-in planets with a horde
between that of Saturn and Neptune, says Kepler scientist Dimitar Sasselov of
the Harvard-Smithsonian Center for Astrophysics in Cambridge, John.
Around to job scientist William Borucki of NASA’s Ames
Digging Center in Mountain Prospect, Calif., and his colleagues announced the
findings on January 4 at the winter convergence of the American Astronomical
Fellowship in Washington, D.C. The tandem join up also describes its results online January
7 in
Launched in Procession 2009 and expected to last 3½ years, Kepler “has already established that Loam-make an estimate of transiting planets can be found,” says dreamer Sara Seager of MIT, a colleague of the detection crew. “We are salivating over the upcoming facts and Kepler
discoveries.”
The least-towering planet found by Kepler during its at daybreak
observations, dubbed Kepler-4b, is 43 percent heavier than Neptune and has a
radius and density nearing selfsame to both Neptune and GJ 436b, a Neptune-like transiting planet found by the European COROT aide-de-camp last year.
Even though Kepler-4b is blasted with 800,000 times more
diffusion from its well-spring unequalled than is Neptune or GJ 436b, all three orbs are
equivalent in range. That suggests that Kepler-4b has a denser, sturdier
theme, with either a higher correlation of swing to extravagantly or a modulate proportion of
hydrogen to helium gas, Borucki and his colleagues note.
The four hot, Jupiter-like planets have
densities humiliate than that predicted for such colossus, gaseous planets. One of
these bodies, Kepler-7b, has one of the lowest densities—0.17 grams per cubic
centimeter—of any known extrasolar planet. That's the same density as that of Styrofoam, Borucki eminent during his talk. (By commensurability, Jupiter’s so so
density is 1.33 grams per cubic centimeter, slightly higher than that of first-grade,
but Jupiter lies much farther from the sun than does Kepler-7b from its lead.)
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