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Showing 1–3 of 3 results
Advanced filters: Author: Gautam Vasisht Clear advanced filters

  • Water, carbon monoxide and methane are anticipated to be the main molecules (other than hydrogen) in the atmosphere of extrasolar planets. This paper reports a near-infrared transmission spectrum of the planet HD 189733b that shows the presence of methane and water, however, carbon monoxide is not seen.

    • Mark R. Swain
    • Gautam Vasisht
    • Giovanna Tinetti
    Research
    Nature
    Volume: 452, P: 329-331

  • Infrared spectroscopy can probe the conditions and compositions of exoplanet atmospheres. Previous results relied on space-based telescopes that do not provide spectroscopic capability in the 2.4–5.2 μm spectral region. Here, ground-based observations of the dayside emission spectrum for HD 189733b are reported between 2.0–2.4 μm and 3.1–4.1 μm; an unexpected feature at around 3.25 μm is found that is difficult to explain with models that assume local thermodynamic equilibrium conditions, and is assigned to methane.

    • Mark R. Swain
    • Pieter Deroo
    • Thomas Henning
    Research
    Nature
    Volume: 463, P: 637-639