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    white dwarf tagged posts

    Dead Star’s Cannibalism of its Planetary System is most far-reaching ever witnessed

    June 16, 2022, Categories  Astronomy/Space

    Artist’s illustration shows a white dwarf star siphoning off debris from shattered objects in a planetary system. NASA, ESA, Joseph Olmsted (STScI)

    White dwarf sheds light on the systemic chaos that occurs when a star dies. The violent death throes of a nearby star so thoroughly disrupted its planetary system that the dead star left behind — known as a white dwarf — is sucking in debris from both the system’s inner and outer reaches, UCLA astronomers and colleagues report today.

    This is the first case of cosmic cannibalism in which astronomers have observed a white dwarf consuming both rocky-metallic material, likely from a nearby asteroid, and icy material, presumed to be from a body similar to those found in the Kuiper belt at the fringe of our own solar system.

    “We have neve...

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    Astronomers discover Micronovae, a new kind of Stellar Explosion

    April 21, 2022, Categories  Astronomy/Space

    This artist’s impression shows a two-star system where micronovae may occur. The blue disc swirling around the bright white dwarf in the centre of the image is made up of material, mostly hydrogen, stolen from its companion star. Towards the centre of the disc, the white dwarf uses its strong magnetic fields to funnel the hydrogen towards its poles. As the material falls on the hot surface of the star, it triggers a micronova explosion, contained by the magnetic fields at one of the white dwarf’s poles.

    A team of astronomers, with the help of the European Southern Observatory’s Very Large Telescope (ESO’s VLT), have observed a new type of stellar explosion — a micronova. These outbursts happen on the surface of certain stars, and can each burn through around 3...

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    Mysterious Energy Source unlike anything Astronomers have seen before

    January 27, 2022, Categories  Astronomy/Space

    An artist’s impression of what the object might look like if it’s a magnetar. Magnetars are incredibly magnetic neutron stars, some of which sometimes produce radio emission. Known magnetars rotate every few seconds, but theoretically, “ultra-long period magnetars” could rotate much more slowly. Credit: ICRAR.

    A team mapping radio waves in the universe has discovered something unusual that releases a giant burst of energy three times an hour, and it’s unlike anything astronomers have seen before.

    The team that discovered it think it could be a neutron star or a white dwarf—collapsed cores of stars—with an ultra-powerful magnetic field...

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    Astronomers have identified a White Dwarf so Massive that it might Collapse

    July 1, 2021, Categories  Astronomy/Space

    This illustration highlights a newfound small white dwarf that is somewhat larger than earth’s moon. the two bodies are shown next to each other for size comparison. the hot, young white dwarf is the most massive white dwarf known, weighing 1.35 times as much as our sun. Credit: Giuseppe Parisi

    Astronomers have identified an extremely magnetized and rapidly rotating ultra-massive white dwarf. Several telescopes characterized the dead star. Maunakea and Haleakala, Hawai’i — Astronomers have discovered the smallest and most massive white dwarf ever seen...

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