NASA’s Webb Finds Signs of Possible Aurorae on Isolated Brown Dwarf

NASA’s Webb Finds Signs of Possible Aurorae on Isolated Brown Dwarf

Handout photo - Astronomers used NASA’s James Webb Space Telescope to study 12 cold brown dwarfs. Two of them – W1935 and W2220 – appeared to be near twins of each other in composition, brightness, and temperature. However, W1935 showed emission from methane, as opposed to the anticipated absorption feature that was observed toward W2220. The team speculates that the methane emission may be due to processes generating aurorae. Astronomers using NASA’s James Webb Space Telescope found infrared emission from methane coming from W1935. This is an unexpected discovery because the brown dwarf is cold and lacks a host star; therefore, there is no obvious source of energy to heat its upper atmosphere and make the methane glow. The team speculates that the methane emission may be due to processes generating aurorae, shown here in red. Infrared emission from methane suggests atmospheric heating by auroral processes. These findings are being presented at the 243rd meeting of the American Astronomical Society in New Orl

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