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Showing 1–9 of 9 results
Advanced filters: Author: Coel Hellier Clear advanced filters

  • A primordial carbon-to-oxygen ratio (C/O) greater than 0.8 in an exoplanet causes a carbide-dominated interior, as opposed to the silicate-dominated composition found on Earth; the atmospheres also can differ from those in the Solar System. The solar C/O is 0.54. This study reports an analysis of spectra from the transiting hot Jupiter WASP-12b that reveals that C/O>1 in its atmosphere, based upon the observed concentrations of the prominent molecules CO, CH4 and H2O.

    • Nikku Madhusudhan
    • Joseph Harrington
    • Richard G. West
    Research
    Nature
    Volume: 469, P: 64-67

  • 'Hot Jupiters' abound in lists of known extrasolar planets. Those closest to their parent stars have strong tidal interactions, leading to the suggestion that systems such as OGLE-TR-56 could be used as tests of tidal dissipation theory. Here, the discovery of planet WASP-18b is reported, with an orbital period of 0.94 days and a tidal interaction an order of magnitude stronger than that of OGLE-TR-56b. Either WASP-18 is in a rare, short-lived state, or the tidal dissipation in this system must be weaker than in the Solar System.

    • Coel Hellier
    • D. R. Anderson
    • P. J. Wheatley
    Research
    Nature
    Volume: 460, P: 1098-1100

  • Precise mass and radius measurements of giant planet WASP-193 b find an extremely low density of 0.059 ± 0.014 g cm−3. Current evolutionary models cannot fully explain such a low density, but the extended atmosphere makes WASP-193 b very suitable for high-precision characterization via JWST.

    • Khalid Barkaoui
    • Francisco J. Pozuelos
    • Richard G. West
    Research
    Nature Astronomy
    Volume: 8, P: 909-919

  • The radial-velocity technique could detect a small gas giant orbiting a binary star and determine its mass: 65.2 ± 11.8 Earth masses. The system also hosts a smaller inner planet, making it one of the few known multiplanetary circumbinary systems.

    • Matthew R. Standing
    • Lalitha Sairam
    • William F. Welsh
    Research
    Nature Astronomy
    Volume: 7, P: 702-714