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    core accretion tagged posts

    New Image Reveals Secrets of Planet Birth

    July 28, 2023, Categories  Astronomy/Space

    The background of this image is dark, but in its centre lurks a swirling ghostly figure, which extends towards the edge of the picture. At the very centre there is a small bright region and erupting out of it there is a poorly defined, fuzzy edged cloud and blobs of material in yellow and blue, respectively. The yellow cloud extends far out in the image, making an elongated spiral shape that gets dimmer and less defined as it reaches the top and bottom of the frame. Meanwhile, the blue blobs only extend downwards from the centre and to a fraction of the distance of the yellow spiral cloud. The blobs twist away from the central bright region, forming a tight U-shape lying on its right side.
    A spectacular new image released today by the European Southern Observatory gives us clues about how planets as massive as Jupiter could form. Using ESO’s Very Large Telescope (VLT) and the Atacama Large Millimeter/submillimeter Array (ALMA), researchers have detected large dusty clumps, close to a young star, that could collapse to create giant planets.

    Astronomers have gained new clues about how planets as massive as Jupiter could form. Researchers have detected large dusty clumps, close to a young star, that could collapse to create giant planets.

    A spectacular new image released today by the European Southern Observatory gives us clues about how planets as massive as Jupiter could form...

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    Small Stars may Host Bigger Planets than previously thought

    March 23, 2023, Categories  Astronomy/Space

    Artist’s impression of sunrise on planet NGTS-1b, a gas giant previously discovered orbiting a low-mass star. Credit: University of Warwick/Mark Garlick

    Stars with less than half the mass of our sun are able to host giant Jupiter-style planets, in conflict with the most widely accepted theory of how such planets form, according to a new study led by UCL (University College London) and University of Warwick researchers.

    Gas giants, like other planets, form from disks of material surrounding young stars. According to core accretion theory, they first form a core of rock, ice and other heavy solids, attracting an outer layer of gas once this core is sufficiently massive (about 15 to 20 times that of Earth).

    However, low-mass stars have low-mass disks that, models predict, would not provide enough material to form a gas giant in this way, or at least not quickly enough before the disk breaks up.

    In the study, accepted for publica...

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    Hubble finds a Protoplanet that could Upend Planet Formation Models

    April 6, 2022, Categories  Astronomy/Space

    Researchers were able to directly image newly forming exoplanet AB Aurigae b over a 13-year span using Hubble’s Space Telescope Imaging Spectrograph (STIS) and its Near Infrared Camera and Multi-Object Spectrograph (NICMOS). In the top right, Hubble’s NICMOS image captured in 2007 shows AB Aurigae b in a due south position compared to its host star, which is covered by the instrument’s coronagraph. The image captured in 2021 by STIS shows the protoplanet has moved in a counterclockwise motion over time.
    Credits: Science: NASA, ESA, Thayne Currie (Subaru Telescope, Eureka Scientific Inc.); Image Processing: Thayne Currie (Subaru Telescope, Eureka Scientific Inc.), Alyssa Pagan (STScI)

    NASA’s Hubble Space Telescope has directly photographed evidence of a Jupiter-like protoplanet for...

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