Detection of hydrogen sulfide above the clouds in Uranus’s atmosphere

  title={Detection of hydrogen sulfide above the clouds in Uranus’s atmosphere},
  author={Patrick J. G. Irwin and Daniel Toledo and Ryan Garland and Nicholas A. Teanby and Leigh N. Fletcher and Glenn Orton and Bruno B{\'e}zard},
  journal={Nature Astronomy},
Visible-to-near-infrared observations indicate that the cloud top of the main cloud deck on Uranus lies at a pressure level of between 1.2 bar and 3 bar. However, its composition has never been unambiguously identified, although it is widely assumed to be composed primarily of either ammonia or hydrogen sulfide (H2S) ice. Here, we present evidence of a clear detection of gaseous H2S above this cloud deck in the wavelength region 1.57–1.59 μm with a mole fraction of 0.4–0.8 ppm at the cloud top… 
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