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Extrasolar planet Gliese 436b light curves


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Animation showing the light curves of the extrasolar planetary system of the red dwarf star Gliese 436. As the planet's orbit is nearly edge-on to Earth, it passes in front of its star periodically, blocking some of its light and causing a regular dip in brightness, as shown by the yellow line. At the other side of the planet's orbit, it passes behind the star, and some of its own light is blocked. The coloured lines show six wavelengths of infrared light, and the varying degrees to which they're affected. The differences allow some information on the planet's temperature and chemical make-up to be gathered. The measurements revealed a Neptune-sized planet orbiting at some 4 million kilometres. Its surface temperature was found to be around 439 degrees Celsius, much hotter than would have been expected at its distance, implying a greenhouse effect at work. The measurements also revealed an abundance of carbon monoxide and a deficiency of methane. Gliese 436b was discovered in 2004, and these refined measurements were made in 2010 by the Spitzer Space Telescope.

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