Stench of a gas giant? Nearby exoplanet reeks of rotten eggs. And that's a good thing [View all]

By Press Releases

Research led by Guangwei Fu (Johns Hopkins University), et al

Jul 08, 2024



Concept art of HD 189733 b, the closest transiting hot Jupiter to Earth. (Image credit: Roberto Molar Candanosa/Johns Hopkins University)

BALTIMORE — An exoplanet infamous for its deadly weather has been hiding another bizarre feature—it reeks of rotten eggs, according to a new Johns Hopkins University study of data from the James Webb Space Telescope.

The atmosphere of HD 189733 b, a Jupiter-sized gas giant, has trace amounts of hydrogen sulfide, a molecule that not only gives off a stench but also offers scientists new clues about how sulfur, a building block of planets, might influence the insides and atmospheres of gas worlds beyond the solar system. The findings are published today in Nature.

“Hydrogen sulfide is a major molecule that we didn’t know was there. We predicted it would be, and we know it’s in Jupiter, but we hadn’t really detected it outside the solar system,” said Guangwei Fu, an astrophysicist at Johns Hopkins who led the research. “We’re not looking for life on this planet because it’s way too hot, but finding hydrogen sulfide is a stepping stone for finding this molecule on other planets and gaining more understanding of how different types of planets form.”



HD 189733 b has been the benchmark planet for atmospheric characterization since its discovery in 2005. (Image credit: Roberto Molar Candanosa/Johns Hopkins University)

In addition to detecting hydrogen sulfide and measuring overall sulfur in HD 189733 b’s atmosphere, Fu’s team precisely measured the main sources of the planet’s oxygen and carbon—water, carbon dioxide, and carbon monoxide.

More:
https://studyfinds.org/exoplanet-reeks-of-rotten-eggs/