First Confirmed Atmosphere Around Rocky Exoplanet in Habitable Zone Discovered
- Scientists have confirmed an atmosphere around LHS 1140b, a rocky exoplanet in the habitable zone.
- The findings mark the first direct identification of atmospheric species for any rocky exoplanet outside our solar system.
- Data from observations indicate helium is escaping from the planet into space.
Discovery of LHS 1140b's Atmosphere
A significant milestone in the search for life beyond Earth has been achieved with the discovery of an atmosphere around LHS 1140b, a rocky exoplanet located within its star’s habitable zone. This planet is approximately 49 light years away and was discovered in 2017. The findings have been published in the journal Science.
Significance of the Discovery
This discovery, led by Dr. Collin Cherubim at Harvard University (now based elsewhere), marks a breakthrough as it is the first confirmed atmosphere around a rocky exoplanet within the habitable zone outside our solar system. The team observed LHS 1140b as it passed in front of its star using an infrared spectrograph mounted on the Magellan Clay telescope at Las Campanas Observatory in Chile, capturing data that revealed helium escaping into space.
Characteristics and Challenges
LHS 1140b has a mass about 5.6 times that of Earth and is 70% larger in radius. While similar to Earth in some ways, such as overall composition and temperature, it differs significantly due to its tidally locked state, potential for extensive water coverage, and likely very different atmosphere. Dr. Cherubim highlighted the planet’s suitability as a laboratory for studying astrobiology and habitability outside our solar system.
Observations and Analysis
The initial findings were published in 2024, but when no helium was detected during subsequent observations in 2025, it caused a major re-analysis. Dr. Cherubim noted that every possible explanation for the signal was ruled out with confidence, including contamination from Earth’s atmosphere.
Reactions and Implications
The discovery has garnered significant attention, as it provides crucial insights into what it's like to live with a red dwarf star. Jayne Birkby, an astrophysics professor at the University of Oxford, emphasized that while small red dwarfs are common and our best chance for studying nearby rocky exoplanets in their habitable zones, they often strip away planetary atmospheres, making LHS 1140b's atmosphere a rare find.
Dr. Yamila Miguel from Leiden Observatory also welcomed the results, noting that planets close to their host stars can lose atmospheric gases to space. She added, 'What makes this planet so interesting is that it is losing enough of its atmosphere that we can actually detect it from here, which is not easy for a small, rocky planet.'
While these findings do not directly imply the presence of life on LHS 1140b, they suggest a promising environment where conditions could support biological processes. The next steps involve further analysis to understand how this atmosphere affects surface conditions and what potential protective mechanisms would be necessary for any hypothetical life forms.
Source: The Guardian
Science Daily
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