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Showing 1–10 of 10 results
Advanced filters: Author: Christopher Udry Clear advanced filters

  • A population of extrasolar planets has been uncovered with minimum masses of 1.9–10 times the Earth's mass, called super-Earths, but atmospheric studies can be precluded by the distance and size of their stars. Here, observations of the transiting planet GJ 1214b are reported; it has a mass 6.55 times that of the Earth and a radius 2.68 times the Earth's radius. The star is small and only 13 parsecs away, permitting the study of the planetary atmosphere with current observatories.

    • David Charbonneau
    • Zachory K. Berta
    • Thierry Forveille
    Research
    Nature
    Volume: 462, P: 891-894

  • Absorption lines of iron in the dayside atmosphere of an ultrahot giant exoplanet disappear after travelling across the nightside, showing that the iron has condensed during its travel.

    • David Ehrenreich
    • Christophe Lovis
    • Filippo Zerbi
    Research
    Nature
    Volume: 580, P: 597-601

  • The presence of iron-rich X-ray amorphous material on the Martian surface is consistent with in situ aqueous alteration indicative of cool and relatively wet conditions in the past, according to a comparison between material from various terrestrial soils and Gale crater

    • Anthony D. Feldman
    • Elisabeth M. Hausrath
    • Thomas Sharp
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 5, P: 1-15

  • Quantifying the amount of water in meteorites remains challenging, with minerals the key to understanding water contents. Here, Adcocket al. perform shock experiments on H+-bearing whitlockite demonstrating that it may transform into anhydrous merrillite, which is commonly found in Martian meteorites.

    • C. T. Adcock
    • O. Tschauner
    • C. Lin
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-8

  • Observations of TOI-849b reveal a radius smaller than Neptune’s but a large mass of about 40 Earth masses, indicating that the planet is the remnant core of a gas giant.

    • David J. Armstrong
    • Théo A. Lopez
    • Zhuchang Zhan
    Research
    Nature
    Volume: 583, P: 39-42

  • LTT 9779 b is Neptune-sized planet rotating around its star with a period of 0.79 days and an equilibrium temperature of 2,000 K. It is not clear how it retained its atmospheric envelope, which contains ~10% of H/He, as it should have been photoevaporated by now.

    • James S. Jenkins
    • Matías R. Díaz
    • Andrew W. Mann
    Research
    Nature Astronomy
    Volume: 4, P: 1148-1157

  • Three planets orbit the Sun-like star ν2 Lupi. CHEOPS data show that all of them are transiting and show remarkable diversity. In particular, dry and gas-poor inner planet b has experienced extensive atmospheric loss, while planets c and d are water rich and have a small gaseous envelope of primordial origin.

    • Laetitia Delrez
    • David Ehrenreich
    • Nicholas A. Walton
    Research
    Nature Astronomy
    Volume: 5, P: 775-787

  • Data from the Kepler spacecraft and the HARPS-N ground-based spectrograph indicate that the extrasolar planet Kepler-78b has a mean density similar to that of Earth and imply that it is composed of rock and iron.

    • Francesco Pepe
    • Andrew Collier Cameron
    • Christopher A. Watson
    Research
    Nature
    Volume: 503, P: 377-380