New brown dwarf discovered from James Webb early release data

Astronomers’ understanding of objects close to the contentious planet/star border, including massive exoplanets, may be improved by studying T dwarfs. Although there have been several discoveries of brown dwarfs to date, there have only been 400 discoveries of T dwarfs to date.

In light of this, the newly discovered brown dwarf, most likely belonging to the T dwarf subclass, according to a team of astronomers led by Mario Nonino of the Astronomical Observatory of Trieste in Italy. The finding was made as part of the JWST Early Release Science (ERS) program “Through the Looking GLASS” (GLASS-JWST), which used the Near-Infrared Spectrograph (NIRSPEC), Near-Infrared Imager, and Slitless Spectrograph to study the large galaxy cluster Abell 2744. (NIRISS).

“We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 µm wavelengths and the panchromatic 0.9–4.5 µm coverage of the spectral energy distribution,” the researchers wrote in the paper.

The brown dwarf is probably about 30 times larger than Jupiter

The study estimates that GLASS-JWST-BD1 has an effective temperature of roughly 600 K and a mass of about 31.43 Jupiter masses. This brown dwarf is thought to be 5 billion years old.

GLASS-JWST-BD1 may be a late-type T dwarf, according to comparisons with theoretical models. Its distance, measured in a direction perpendicular to the galactic plane, was found to be between 1,850 and 2,350 light years. The findings suggest that this object is probably a thick disc or halo object in the Galactic population.

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