Groundbreaking Discovery: Helium Detected in Atmosphere of LHS 1140 b
Astronomers have achieved a significant milestone in the study of exoplanets by directly detecting helium in the atmosphere of LHS 1140 b. This rocky exoplanet, located 48 light-years away, resides within its star’s habitable zone. The discovery is a landmark achievement as it marks the first confirmed atmosphere around a rocky Earth-like planet in such a zone, bolstering the hypothesis that planets orbiting red dwarfs can retain atmospheres and potentially hold liquid water.
The Exciting Implications of Helium Detection
“We’ve actually directly detected helium that’s present in the atmosphere itself, and this is the first direct detection of a rocky exoplanet, which is really exciting,” commented lead author Collin Cherubim, who recently earned his Ph.D. from Harvard University. “And then there’s this added benefit that it’s in the habitable zone, which is super exciting for astrobiology, habitability, and the search for life,” Cherubim shared with Space.com. “It seems a little surreal.”
This exoplanet was initially discovered in 2017 by a team led by astronomer Jason Dittmann, who is now a co-author of this new discovery. “This planet was discovered about 10 years ago, and we just said, okay, this is an atmosphere,” Dittmann told Space.com. “We’re slowly closing the gap and checking these boxes… we find a rocky planet, a planet that has the right temperature and now… it’s like okay, we finally found one that has an atmosphere.”
A Closer Look at LHS 1140 b
Being a rocky planet, “there’s definitely a surface… it’s made of rocks,” Dittmann explained. Determining the planet’s surface details remains a challenge, but researchers believe there’s a good chance it contains water. Despite orbiting a red dwarf star, which is smaller and cooler than our sun, LHS 1140 b orbits closer to its star than Earth does to the Sun, maintaining a temperature within the “Goldilocks zone,” where liquid water could exist on its surface.
“It probably also contains a lot of water,” Cherubim suggested. “If there is a certain amount of atmosphere that can produce a slight greenhouse effect, which we now know… that will most likely be what we consider habitable conditions on Earth, and conditions that would probably support liquid water.”
Comparing Earth and LHS 1140 b
Is LHS 1140 b like Earth? While it is not an Earth replica, it can be considered Earth-like in two significant ways, according to Cherubim. First, its overall composition is rocky, likely featuring an iron core, and it has an atmosphere. Second, the planet’s temperature is suitable for liquid water, a vital component for life as we know it on Earth.
“I am not claiming that this planet supports life,” Cherubim clarified. Further research will help scientists better understand what might be in this planet’s atmosphere and whether it contains water. Although future observations might not conclusively confirm habitability or identify life, they will provide valuable insights into planets like this one.
The results of this groundbreaking study were published in the journal Science. For more information, visit the full report here.
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