Word: 209458b
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...second planet, HD 209458b, studied by L. Jeremy Richardson of NASA’s Goddard Space Flight Center, shows signs of silicates in the atmosphere, according to a press release from the Harvard-Smithsonian Center for Astrophysics...
...This planet would float high, like a beach ball,” Noyes said, explaining that HAT-P-1 has a density that is a quarter that of water’s. It’s not the only low-density, large-mass planet—in fact, HD 209458b was detected in 2000—but HAT-P-1 turned out to be the most baffling. Noyes said that current methods of calculating planetary dimensions significantly underestimate the size of HAT-P-1. “Now we have two oddballs, and we’re beginning to wonder...
Harvard’s team observed light from TrES-1, while GSFC’s team observed light from HD 209458b, but Charbonneau said the similarity of the results makes them even more convincing...
...addition, Charbonneau said the GSFC team discovered that HD 209458b, which is 70 percent of Jupiter’s mass but 35 percent larger, orbits in a circular path. Previously, he said, astronomers believed that the planet’s surprising largeness could be explained by an elliptical orbit, but said this theory no longer holds...
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