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Showing 1–11 of 11 results
Advanced filters: Author: Ravit Helled Clear advanced filters

  • Cosmochemical evidence is used to constrain models of Jupiter formation, which unfolds in three distinct phases: a rapid pebble accretion during the first Myr, followed by a slower growth controlled by larger planetesimals, ending in a runaway gas accretion stage.

    • Yann Alibert
    • Julia Venturini
    • Maria Schönbächler
    Research
    Nature Astronomy
    Volume: 2, P: 873-877

  • On Uranus and Neptune, the measured fourth-order gravity harmonic, J4, constrains the atmospheric dynamics to the outermost 0.15 per cent and 0.2 per cent, respectively, of the planetary mass, indicating that these dynamics are confined to a thin weather layer no more than 1,000 kilometres deep on both planets.

    • Yohai Kaspi
    • Adam P. Showman
    • Ravit Helled
    Research
    Nature
    Volume: 497, P: 344-347

  • Understanding the behaviour of materials at high pressures and temperatures is of great importance to planetary science and the physics of warm dense matter. This Review addresses the close connection between modelling the interiors of gaseous planets and the high-pressure physics of hydrogen and helium.

    • Ravit Helled
    • Guglielmo Mazzola
    • Ronald Redmer
    Reviews
    Nature Reviews Physics
    Volume: 2, P: 562-574

  • 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

  • Modelling of Earth- or super-Earth-sized planets with a thick H–He atmosphere shows that the hydrogen collision-induced absorptions in the infrared wavelength can make the planet amenable to hosting surface liquid water for several billion years, thus creating a long-term potentially habitable environment.

    • Marit Mol Lous
    • Ravit Helled
    • Christoph Mordasini
    ResearchOpen Access
    Nature Astronomy
    Volume: 6, P: 819-827

  • A direct imaging study demonstrates the existence of a giant planet in a wide orbit around the high-mass b Centauri binary system, and uses measurements of the orbital properties to discuss its formation mechanism.

    • Markus Janson
    • Raffaele Gratton
    • Joseph C. Carson
    Research
    Nature
    Volume: 600, P: 231-234

  • 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

  • The formation mechanism of the most common type of planet in the Galaxy, those with masses between those of the Earth and Neptune, is far from clear. However, simulations of disk fragmentation presented here, which incorporate a spiral-driven dynamo, produce protoplanets of the right mass and longevity.

    • Hongping Deng
    • Lucio Mayer
    • Ravit Helled
    Research
    Nature Astronomy
    Volume: 5, P: 440-444

  • An energetic head-on collision between a large impactor and the proto-Jupiter with a primordial compact core could have mixed the heavy elements within the deep interior, leading to a ‘diluted’ core for Jupiter.

    • Shang-Fei Liu
    • Yasunori Hori
    • Andrea Isella
    Research
    Nature
    Volume: 572, P: 355-357