Astronomers have discovered a Jupiter-like planet previously deemed impossible to detect, with an atmosphere rich in ammonia and clouds of water, giving it a distinct aroma reminiscent of urine.
Discovery of Epsilon Indi Ab
An international team of scientists, utilizing the advanced James Webb Space Telescope (JWST), has been studying the atmosphere of Epsilon Indi Ab. This gas giant, located several light-years away, has a mass approximately 7.6 times that of Jupiter but is similar in size. It orbits its star at a significantly greater distance than many exoplanets, resulting in a relatively cool temperature range between -70°C and +20°C.
Unexpected Atmospheric Composition
During their observations, the team made a surprising discovery: alongside an ammonia-rich atmosphere, they detected clouds of water. Such water clouds are not typically incorporated into many existing exoplanet atmosphere models due to their complex nature. This finding challenges current understanding and opens new avenues for research.
Elisabeth Matthews from the Max Planck Institute for Astronomy, lead author of the study, remarked: "JWST is finally allowing us to study solar-system analogue planets in detail. If we were aliens, several light years away, and looking back at the Sun, JWST is the first telescope that would allow us to study Jupiter in detail. For studying Earth in detail, we would need much more advanced telescopes, though."
Implications for Future Research
James Mang of the University of Texas at Austin added: "What once seemed impossible to detect is now within reach, allowing us to probe the structure of these atmospheres, including the presence of clouds. This reveals new layers of complexity that our models are now beginning to capture, and opens the door to even more detailed characterisation of these cold, distant worlds."
A Less Appealing Aspect
The less appealing aspect lies in the atmospheric composition. Ammonia and water are primary components of urine, with ammonia causing its pungent smell. This suggests any future visit to Epsilon Indi Ab could be met with an unpleasant odour, particularly if it were to rain.
NASA’s planned Nancy Grace Roman Space Telescope, expected later this decade, may directly detect such reflective clouds. This could confirm if Epsilon Indi Ab is a world best left off humanity's travel itinerary.
