![Planet absorption signature Planet absorption signature. a) In the stellar rest frame, the planetary absorption signal appears close to the expected Keplerian of the planet, superimposed in white with its 1σ uncertainty. Transit contacts are shown by white horizontal dashed lines. The gap around 0 km/s corresponds to the position of the Doppler shadow before its subtraction. b) In the planet rest frame, the shimmer is asymmetric and progressively blueshifts after ingress.](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/Planet_absorption_signature_final.png?h=3e286ba5&itok=A6cg1pt4)
Ultrahot giant exoplanets receive thousands of times Earth’s insolation. Their high-temperature atmospheres (greater than 2,000 kelvin) are ideal laboratories for studying extreme planetary climates and chemistry. Daysides are predicted to be cloud-free, dominated by atomic species and much hotter than nightside. Atoms are expected to recombine into molecules over the nightside, resulting in different day and night chemistries. Although metallic elements and a large temperature contrast have been observed, no chemical gradient has been measured across the surface of such an exoplanet
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