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Astronomical research on stellar and brown dwarf properties

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2026-10-29 07:19 UTC → 2026-11-08 16:28 UTC · added ~~removed~~

Astronomers have introduced new methodologies for studying stellar and sub-stellar objects. One approach involves analyzing chemical compositions, specifically beryllium and lithium levels, to identify stars that have consumed orbiting planets. A team led by the University of São Paulo utilized these differences to detect planetary matter ingestion; specifically, studying the binary star system HD 129171 revealed an excess of refractory elements and beryllium, suggesting the star absorbed rocky material exceeding 11 Earth masses. Simultaneously, researchers have utilized James Webb Space Telescope (JWST) data to analyze the atmospheric conditions of distant celestial objects. By applying Principal Component Analysis (PCA) to data from the Near-Infrared Spectrograph and Mid-Infrared Instrument, teams identified recurring weather patterns in the brown dwarf SIMP 0136, located approximately 20 light-years away. Researchers from Trinity College Dublin found that the object's atmosphere undergoes cyclic changes driven by temperature fluctuations and vertical cloud structures, creating three recurring weather patterns where hotter regions feature thinner clouds and cooler regions host thicker, higher-altitude cloud layers. Further JWST observations expanded to GJ 504 b, a pink-hued object approximately 57 light-years away, where models suggest clouds composed of manganese sulfide and potassium chloride. Recent JWST observations have also focused on WISE 0855, the coldest known brown dwarf, located approximately 7.5 light-years from Earth. A research team from the University of Arizona’s Steward Observatory conducted 11 hours of continuous spectroscopic observations to monitor the object. The study revealed that high-altitude water clouds thicken and dissipate as the object rotates, driven by both rotation and internal heat. Researchers also detected rhythmic changes in carbon monoxide and phosphine rising from the interior, a process described as being “similar to a lava lamp.” ~~This marks the first time meteorology on a celestial body outside our solar system has been measured with enough resolution to observe real-time atmospheric changes.~~

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