News

This section includes scientific and technological news from the IAC and its Observatories, as well as press releases on scientific and technological results, astronomical events, educational projects, outreach activities and institutional events.

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  • mass-radius_diag_lacedelli
    Research news
    Sibling sub-Neptunes around sibling M dwarfs: TOI-521 and TOI-912
    Sub-Neptunes - planets larger than Earth but smaller than Neptune - are the most common type of planet in our Galaxy, yet they are entirely absent from our own Solar System. This absence makes them a major focus for astronomers seeking to understand planetary formation and evolution. We recently conducted an international study, as part of the THIRSTEE project, to characterize two such planets orbiting very similar small, cool stars known as M dwarfs: TOI-521 and TOI-912 . THIRSTEE is an observational-based program that aims to shed light on the sub-Neptune population by providing an
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  • Eclipse caused by a super-Jupiter or brown dwarf with massive rings
    Press release
    A giant ring system around a substellar object causes a rare nine-month eclipse of its host star
    An international scientific team, involving the University of La Laguna (ULL) and the Instituto de Astrofísica de Canarias (IAC), has identified the cause of an unusually long dimming of a distant star . The phenomenon is explained by the passage of a substellar object with a giant ring system, similar to a ‘cosmic saucer’, in front of the host star. The star, named ASASSN-24fw, is located in the Monoceros constellation at about 3,000 light-years away from Earth. The star faded steadily for more than nine months between late 2024 and mid-2025 to about 97% dark before returning to its normal
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  • SFH of thick and thin disks
    Research news
    Chronology of our Galaxy from Gaia colour-magnitude diagram fitting (ChronoGal): II. Unveiling the formation and evolution of the kinematically selected Thick and Thin Discs
    Research on the formation, origin, and evolution of the dichotomy between the thin and thick disk components of the Milky Way has been a major topic of study, as it is key to understanding how our Galaxy formed. However, this is not an easy task, since populations defined by their morphology or kinematics show a mixture of chemically distinct stellar populations. Age therefore becomes a fundamental parameter for understanding the evolution of the Galactic disk. Our goal is to derive the age and metallicity distributions of the thin and thick disks defined kinematically, in order to reveal
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  • Artistic impression of a runaway star propelled by a supernova explosion
    Press release
    IAC researchers participate in the largest Milky Way study of massive runaway stars
    Researchers from the Instituto de Astrofísica de Canarias (IAC), in collaboration with the Instituto de Ciencias del Cosmos de la Universidad de Barcelona (ICCUB) and the Instituto de Estudios Espaciales de Cataluña (IEEC), have carried out the largest observational study to date on massive runaway stars including rotation and binarity in the Milky Way. This work, recently published in Astronomy & Astrophysics , sheds light on how these stellar “fugitives” are launched into space and what their properties reveal about their intriguing origins. Runaway stars are stars that travel through
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  • Comparison between an observed galaxy (right) and a simulated galaxy (left)
    Research news
    An accurate measure of the size of dark matter haloes using the size of galaxies
    In the standard cosmological model (𝜦CDM), galaxies are merely the visible "tips of the icebergs," residing within massive, invisible cocoons of dark matter known as haloes. While these haloes dictate the evolution and motion of galaxies, measuring their true size and mass has long been one of the most challenging tasks in astrophysics. A new study published in Astronomy & Astrophysics by Claudio Dalla Vecchia and Ignacio Trujillo from the Instituto de Astrofísica de Canarias (IAC) proposes a breakthrough: a physically motivated definition of a galaxy’s edge that acts as a precision "ruler"
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  • ARKS gallery of faint debris disks
    Press release
    The IAC and the ULL participate in an unprecedented study with ALMA that reveals the Teenage Years of New Worlds
    An international team, with participation from the University of La Laguna (ULL) and the Instituto de Astrofísica de Canarias (IAC), have, for the first time, captured a detailed snapshot of planetary systems in an era long shrouded in mystery. The study, called ALMA survey to Resolve exoKuiper belt Substructures (ARKS) , is based on a series of 10 articles published simultaneously in the journal Astronomy and Astrophysics and was carried out using the Atacama Large Millimetre/submillimetre Array (ALMA) . Thanks to this work, the sharpest images ever of 24 debris disks, the dusty belts left
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