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    TESS tagged posts

    Discovery of Two Planetary Systems around Sun-like Stars

    December 18, 2023, Categories  Astronomy/Space

    Discovery of two planetary systems around sun-like stars
    Figure 1: The small panel on the top left shows an illustration of NASA’s TESS space telescope, responsible for the first identification of the exoplanets TOI-2141b and TOI-1736b. The background image is a photo of the OHP observatory with the dome of the 1.93 m telescope, where the SOPHIE instrument is installed, responsible for the detection and characterization of the exoplanets TOI-2141b, TOI-1736b, and TOI-1736c. Credit: Eder Martioli.

    A study published today (Dec. 15) in the journal Astronomy & Astrophysics reveals the discovery of two new planetary systems orbiting stars similar to our sun, also known as solar analogs.

    The study was led by Dr...

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    Physics behind Unusual Behavior of Stars’ Super Flares discovered

    December 11, 2023, Categories  Astronomy/Space

    Physics behind unusual behavior of stars' super flares discovered
    Modeled flare atmosphere and synthesized TESS light curves. Credit: The Astrophysical Journal (2023). DOI: 10.3847/1538-4357/ad077d

    Our sun actively produces solar flares that can impact Earth, with the strongest flares having the capacity to cause blackouts and disrupt communications—potentially on a global scale. While solar flares can be powerful, they are insignificant compared to the thousands of “super flares” observed by NASA’s Kepler and TESS missions. “Super flares” are produced by stars that are 100–10,000 times brighter than those on the sun.

    The physics are thought to be the same between solar flares and super flares: a sudden release of magnetic energy...

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    Hubble sees Evaporating Planet getting the Hiccups

    July 31, 2023, Categories  Astronomy/Space

    This artist’s illustration shows a planet (dark silhouette) passing in front of the red dwarf star AU Microscopii. The planet is so close to the eruptive star a ferocious blast of stellar wind and blistering ultraviolet radiation is heating the planet’s hydrogen atmosphere, causing it to escape into space. Four times Earth’s diameter, the planet is slowly evaporating its atmosphere, which stretches out linearly along its orbital path. This process may eventually leave behind a rocky core. The illustration is based on measurements made by the Hubble Space Telescope.
    Credits: NASA, ESA, and Joseph Olmsted (STScI)

    A young planet whirling around a petulant red dwarf star is changing in unpredictable ways orbit-by-orbit...

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    Astronomers find a Planet that Shouldn’t Exist

    June 30, 2023, Categories  Astronomy/Space

    A "hot Jupiter" exoplanet named Halla may have orbited two stars at one time. Interactions between the two stars may have helped Halla survive a stellar outburst.
    A “hot Jupiter” exoplanet named Halla may have orbited two stars at one time. Interactions between the two stars may have helped Halla survive a stellar outburst. Adam Makarenko/W.M. Keck Observatory

    When our sun reaches the end of its life, it will expand to 100 times its current size, enveloping the Earth. Many planets in other solar systems face a similar doom as their host stars grow old. But not all hope is lost, as astronomers from the University of HawaiÊ»i Institute for Astronomy (UH IfA) have made the remarkable discovery of a planet’s survival after what should have been certain demise at the hands of its sun.

    The Jupiter-like planet 8 UMi b, officially named Halla, orbits the red giant star Baekdu (8 UMi) at only half the distance separating the Earth and the sun...

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