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Showing 1–4 of 4 results
Advanced filters: Author: Göran Östlin Clear advanced filters

  • Observations from the JWST MIRI showed the detection of 14NH3 and 15NH3 isotopologues in the atmosphere of a cool brown dwarf, along with a 14N/15N value consistent with star-like formation by gravitational collapse.

    • David Barrado
    • Paul Mollière
    • Gillian Wright
    Research
    Nature
    Volume: 624, P: 263-266

  • The main observational signature of star-forming galaxies at the highest redshifts is the Lyman-α (Lyα) emission line. But Lyα photons scatter in the neutral interstellar medium of their host galaxies, and may therefore be greatly absorbed by interstellar dust. It is now shown that the average escaping fraction of Lyα photons from star-forming galaxies at redshift z = 2.2 is just 5 per cent. This implies that numerous conclusions based on Lyα-selected samples will require upwards revision by an order of magnitude.

    • Matthew Hayes
    • Göran Östlin
    • Jens Melinder
    Research
    Nature
    Volume: 464, P: 562-565

  • The JWST MIRI transmission spectrum of WASP-107b, a transiting planet with Neptune-like mass and Jupiter-like radius, shows observations of sulfur dioxide and silicate clouds but no methane in its atmosphere, providing evidence of disequilibrium chemistry and active photochemistry.

    • Achrène Dyrek
    • Michiel Min
    • Gillian Wright
    Research
    Nature
    Volume: 625, P: 51-54

  • A JWST/MIRI spectrum of an early quasar in the mid-infrared indicates that J1120+0641 had a mature feeding structure 760 Myr after the Big Bang. This finding suggests that supermassive black holes and their torii build up surprisingly quickly.

    • Sarah E. I. Bosman
    • Javier Álvarez-Márquez
    • Bart Vandenbussche
    Research
    Nature Astronomy
    Volume: 8, P: 1054-1065