Detection of Phosphine in Brown Dwarf's Atmosphere Illuminates Search for Life in Milky Way

A team of astronomers has discovered the molecule phosphine in the atmosphere of a brown dwarf, dozens of light years from Earth, sparking renewed interest in the molecule as a potential hint of life elsewhere in the galaxy. The presence of phosphine in the atmosphere of Wolf 1130C, a brown dwarf that is old and lacks heavy elements like oxygen, may refine scientific understanding of how and where the molecule could be found in other places.

Key Takeaways:

• The detection of phosphine in the atmosphere of Wolf 1130C, a brown dwarf, may help scientists understand how and where the molecule could be found in other places, potentially refining their search for life in the Milky Way.
• Phosphine, a molecule made of three hydrogen atoms and one phosphorus atom, is tricky to create and easy to destroy, but its finicky nature makes it a promising candidate for being a sign of life.
• The abundance of phosphine in the brown dwarf's atmosphere is what scientists had expected to find, according to Melanie Rowland, an astronomer at the American Museum of Natural History, but it is unclear why other brown dwarfs appear to be lacking in phosphine.
• The discovery is both exciting and frustrating, as Wolf 1130C is not a standard brown dwarf, and its peculiarities make the finding even more surprising.
• The detection of phosphine on Earth is largely made by microbial life in off-putting places, like rotting swamp plants and animal intestines, but the molecule is also found naturally in places that are uninhabitable, like the giant gas planets of Jupiter and Saturn.
• Astronomers must understand the chemistry of phosphine before they can know if it is a result of biology, as the molecule can be formed and destroyed by natural processes.
• Phosphine is uncommon in the universe, as the molecule is destroyed when exposed to ultraviolet light, and won't form in many environments.
• The detection of phosphine in the clouds of the brown dwarf may be a critical piece of the puzzle for figuring out what business phosphine has anywhere else, including in a potentially habitable environment.

Statistics:

• The concentration of phosphine in the atmosphere of Wolf 1130C is 100 parts per billion, meaning that for every one billion particles in the atmosphere, 100 of them are phosphine.
• The observation period of the James Webb Space Telescope that made the detection was not specified in the article.
• The brown dwarf Wolf 1130C is old and lacks heavy elements like oxygen in its atmosphere.
• The article mentions that other brown dwarfs have been observed, but phosphine was barely detected or not detected at all.

Sources:

• Adam Burgasser, an astrophysicist at the University of California, San Diego, who led the study.
• Eileen Gonzales, an astrophysicist at San Francisco State University, who led the analysis.
• Melanie Rowland, an astronomer at the American Museum of Natural History, who was not involved in the work.
• Clara Sousa-Silva, an astrochemist at Bard College, who was involved with the team that potentially detected phosphine on Venus and the discovery of the compound in the clouds of the brown dwarf.
• Science journal, where the study was published.