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James Webb Space Telescope spots alien planet shrouded in weird sand-filled clouds


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By Tereza Pultarova
The James Webb Space Telescope has found a strange alien world shrouded in clouds of sand-like silicate grains.

The exoplanet discovery, described in a new paper as the first detection of its kind, was made by the James Webb Space Telescope’s NIRSpec and MIRI instruments. In the data, astronomers spotted evidence of silicate-rich clouds around a brown dwarf nearly 20 times the size of Jupiter. The finding confirms some earlier theories about these odd planet-like worlds.

Brown dwarfs are strange objects that are not quite big enough to ignite into stars but a little too big for ordinary planets. While brown dwarfs can’t burn regular hydrogen, they can produce their own light and heat by burning deuterium (a less common isotope of hydrogen that contains an extra neutron).

The brown dwarf in question is called VHS 1256 b and orbits two small red dwarf stars, some 72 light-years from Earth in the constellation Corvus, or crow, in the southern sky. Astronomers discovered the strange exoplanet in 2016 and it has puzzled them ever since due to its reddish glow. They believed that glow could be caused by some type of atmosphere. Observations from the James Webb Space Telescope have now confirmed those theories, revealing that VHS 1256 b must be wrapped in thick clouds full of sand-like silicate grains, according to Forbes(opens in new tab).

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“We will know more from iterations on the data reduction,” Brittany Miles, an astronomer at the University of California, Irvine, and lead researcher on the project, told Space.com in an email. “So far, it looks pretty similar to theoretical expectations.”

The Webb data were so detailed they showed that the ratio of the various gases changes throughout VHS 1256 b’s atmosphere, which suggests the atmosphere is not still, but instead wild and turbulent.

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“In a calm atmosphere, there is an expected ratio of, say, methane and carbon monoxide,” Sasha Hinkley, an astronomer at the University of Exeter in the U.K. and one of the study’s co-authors, told Forbes(opens in new tab). “But in many exoplanet atmospheres we’re finding that this ratio is very skewed, suggesting that there is turbulent vertical mixing in these atmospheres, dredging up carbon dioxide from deep down to mix with the methane higher up in the atmosphere.”

VHS 1256 b is small for a brown dwarf, which means that the body is likely young. The exoplanet orbits 360 sun-Earth distances from its two parent stars, following an oval-shaped orbit that takes 17,000 years to complete.

The paper has not yet been published; an early version is currently available on the online preprint repository arXiv.org(opens in new tab).

Follow Tereza Pultarova on Twitter @TerezaPultarova. source: @Spacedotcom

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