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Articles tagged: mini-Neptunes

  • exoplanet atmospheres, exoplanets, mini-Neptunes, super-Jupiters, water worlds 11 December 2019 Water abundance lower than expected on exoplanets

    ... of potassium (K), and that 14 of the 19 planets also contained water. However, the overall trend in H2O abundances, from mini-Neptunes to hot Jupiters, is significantly lower when compared with the metal abundances for the Solar System (in astronomy...

    • exoplanet atmospheres
    • exoplanets
    • mini-Neptunes
    • super-Jupiters
    • water worlds
  • HD 158259, NASA's Transiting Exoplanet Survey Satellite (TESS), six planet system, SOPHIE spectograph, TRAPPIST-1 17 April 2020 A six-planet system is discovered and more could be hiding say astronomers

    ... Observatory in the South of France, astronomers have discovered a six planet system containing a "super-Earth" and five "mini-Neptunes,” all with exceptionally regular spacing; a feature which hints at how the system may have formed. Approximately...

    • HD 158259
    • NASA's Transiting Exoplanet Survey Satellite (TESS)
    • six planet system
    • SOPHIE spectograph
    • TRAPPIST-1
  • chain of resonance, ESPRESSO (Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations), exoplanets, Extremely Large Telescope (ELT), TOI-178 25 January 2021 Unique six-exoplanet system challenges theories of how planets form

    ... in Astronomy & Astrophysics. The observations showed that TOI-178 harboured at least six planets in the super-Earth to mini-Neptune regimes, with orbital periods lasting from just under two days to just over 20 days. Exciting as the...

    • chain of resonance
    • ESPRESSO (Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations)
    • exoplanets
    • Extremely Large Telescope (ELT)
    • TOI-178
  • 09 February 2016 Are Earth-like worlds built like Earth?

    ...but theoretical models of planet formation predict that planets intermediate in size between Earth and Neptune could be gaseous ‘mini- Neptunes,’ rocky ‘Super-Earths,’ or indeed water worlds, thus adding to the uncertainty in planet structures. After...

  • EPIC 210965800, Kepler K2 mission, Kepler mission, Multi-planet system, NASA's Transiting Exoplanet Survey Satellite (TESS) 27 July 2019 Hundreds of new planet candidates detected by Kepler

    ... Gap describes what seems to be an apparent lack of planets with sizes between 1.5 to 3.8 Earth radii – the super-Earth to mini-Neptune class of exoplanet. Why would planets of this size appear to be rare? One explanation to account for the anomaly...

    • EPIC 210965800
    • Kepler K2 mission
    • Kepler mission
    • Multi-planet system
    • NASA's Transiting Exoplanet Survey Satellite (TESS)
  • ESPRESSO (Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations), High Accuracy Radial velocity Planet Searcher (HARPS), LHS1140b, LHS1140c, water worlds 19 October 2020 Astronomers identify a true water-world that could have an ocean over 100 kms deep

    .... And unfortunately the transits of this planet candidate, which is on the border between that of a super-Earth and a mini-Neptune, will not be visible in the re-observation of this star in TESS cycle 3. In addition, the team suggest that the...

    • ESPRESSO (Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations)
    • High Accuracy Radial velocity Planet Searcher (HARPS)
    • LHS1140b
    • LHS1140c
    • water worlds

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