Infrared radiation from an extrasolar planet

A class of extrasolar giant planets-the so-called 'hot Jupiters' (ref. 1)-orbit within 0.05 au of their primary stars (1 au is the Sun-Earth distance). These planets should be hot and so emit detectable infrared radiation. The planet HD 209458b (refs 3, 4) is an ideal candidate for the det...

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