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    hot Neptunes tagged posts

    Astronomers discover a ‘Hot Neptune’ in a Tight Orbit

    November 27, 2024, Categories  Astronomy/Space

    A dark planet, left, is shown in close orbit around its star, right; some of the planet's atmosphere is being blown outward by the star.
    Artist’s concept of “hot Neptune” TOI-3261 b.
    NASA/JPL-Caltech/K. Miller (Caltech/IPAC)

    A Neptune-sized planet, TOI-3261 b, makes a scorchingly close orbit around its host star. Only the fourth object of its kind ever found, the planet could reveal clues as to how planets such as these form.

    An international team of scientists used the NASA space telescope, TESS (the Transiting Exoplanet Survey Satellite), to discover the exoplanet, then made further observations with ground-based telescopes in Australia, Chile, and South Africa. The measurements placed the new planet squarely in the “hot Neptune desert”—a category of planets with so few members that their scarcity evokes a deserted landscape.

    The team, led by astronomer Emma Nabbie of the University of Southern Queensland, pu...

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    Where did the Hot Neptunes go? A Shrinking Planet holds the answer

    December 16, 2018, Categories  Astronomy/Space


    This artist’s illustration shows a giant cloud of hydrogen streaming off a warm, Neptune-sized planet just 97 light-years from Earth. The exoplanet is tiny compared to its star, a red dwarf named GJ 3470. The star’s intense radiation is heating the hydrogen in the planet’s upper atmosphere to a point where it escapes into space. The alien world is losing hydrogen at a rate 100 times faster than a previously observed warm Neptune whose atmosphere is also evaporating away.
    Credit: © Crédit NASA, ESA, and D. Player (STScI)

    Astronomers explain the rarity of the hot Neptunes by their evaporation which transforms them into super-Earths...

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