Telescopes

ORC1 seen by MeerKAT and in the background optical data from the Dark Energy Survey (Image J. English (U. Manitoba)/EMU/MeerKAT/DES(CTIO))

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An article published in the journal “Monthly Notices of the Royal Astronomical Society” reports a study based on a new image of a so-called odd radio circle (ORC). A team of researchers used the MeerKAT radio telescope to observe this structure with a diameter of over one million light-years visible only at radio waves. Each new observation of this type of phenomenon offers new information, as only five of them are known at the moment. The information collected with MeerKAT could help verify the theories that were proposed and reach a reasonably certain explanation for its origin and nature.

Milky Way edge-on view

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An article published in the journal “Nature” reports a study on the Milky Way’s formation that provides evidence that the part known as the thick disc started forming about 13 billion years ago, 2 billion earlier than previously thought. Maosheng Xiang and Hans-Walter Rix of the Max-Planck Institute for Astronomy, Heidelberg, Germany, used data collected by ESA’s Gaia space probe and observations conducted with the LAMOST telescope to reconstruct the Milky Way’s formation and evolution phases. In particular, the researchers focused on the period between 13 and 8 billion years ago, when there were galactic mergers and a lot of hydrogen was consumed in a phase of remarkable star formation.

Artist's concept of a cloud of debris in the system of the star HD 166191 (Image NASA/JPL-Caltech)

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An article published in “The Astrophysical Journal” reports a study on the star system cataloged as HD 166191, which has an estimated age of 10 million years and is still in its formation process with objects that form but also get destroyed following collisions. A team of researchers led by Kate Su of the University of Arizona used data collected between 2015 and 2019 using NASA’s Spitzer Space Telescope and ground-based telescopes to detect traces of debris clouds generated by collisions between planetesimals. The information obtained from these data is very useful to improve our knowledge of the formation and evolution of planetary systems.

Artist's concept of Kepler-854b as en exoplanet compared to Jupiter

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An article published in “The Astronomical Journal” reports a study that reviews the data of four objects discovered a few years ago thanks to NASA’s Kepler space telescope, concluding that at least three of them are actually tiny stars and not planets. A team of researchers used new data collected by ESA’s Gaia space probe to get more precise information on objects cataloged as exoplanets. Kepler-854b, Kepler-840b, and Kepler-699b appear to have sizes between two and four times Jupiter’s, too much even for hot Jupiters very close to their stars but possible for tiny stars. Kepler-747b turns out to have a radius 1.8 times Jupiter’s even though it’s quite far from a star a little smaller than the Sun, so its nature is uncertain.

The pulsar j2030 and part if its filament seen at X-rays and optical frequencies

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An article accepted for publication in “The Astrophysical Journal” reports a study on the long filament generated by the pulsar cataloged as PSR J2030+4415, or simply J2030. Martjin de Vries and Roger Romani of the American Stanford University used observations made using NASA’s Chandra X-ray Observatory and ground-based telescopes to study a filament that has an estimated length of about 7 light-years and is composed of matter but also of antimatter. Pulsar emissions of this type could explain positron detections in the Milky Way.