Residing 1,500 light-years away in the constellation Serpens Cauda, COROT 9 b has about the same diameter as Jupiter and is about 85 percent as massive. It keeps a much greater distance from its host star than the other transiting planets discovered to date, almost all of which reside in scalding hot orbits less than 10 million kilometers from their stars. The newfound world circles its star at about 60 million kilometers, leaving it with a relatively mild temperature that Deeg's group estimates to be between minus 20 degrees Celsius and 150 degrees C, depending on its atmospheric makeup. For comparison, many exoplanets are so close to their stars that their temperatures exceed 1,000 degrees C. The plentiful population of massive exoplanets in star-nuzzling orbits has been dubbed the "hot Jupiters"; COROT 9 b might be called a warm Jupiter—or even a cool one, if its true temperature turns out to be at the lower end of the estimated range.
Posted by rlssec