🔥 Trending LHS 1140b Planet: Scientists Discover Potential Atmosphere on Earth-Like Exoplan

LHS 1140 b is a super-Earth exoplanet that has garnered significant scientific interest due to its rocky composition, location within its star's habitable zone, and the recent discovery of an atmosphere around it. Discovered in 2017, it orbits an M-type (red dwarf) star designated LHS 1140 ¹².

Discovery and Basic Characteristics

LHS 1140 b was initially discovered in 2017 by the MEarth Project using the transit method, which involves observing the slight dimming of a star's light as a planet passes in front of it ²³. Subsequent observations using the High Accuracy Radial Velocity Planet Searcher (HARPS) instrument confirmed its existence and helped determine its mass ³.

Key characteristics of LHS 1140 b include:

• Mass: Approximately 5.6 times the mass of Earth ¹².
• Size: About 70% larger in radius than Earth, classifying it as a super-Earth ².
• Orbital Period: It completes one orbit around its star every 24.7 days ¹.
• Distance from Star: It is located 0.0946 Astronomical Units (AU) from its star ¹. For comparison, Earth is 1 AU from the Sun.
• Host Star: LHS 1140 b orbits LHS 1140, a red dwarf star located 48.80 light-years away in the constellation Cetus ⁴. Red dwarfs are known for being cooler and smaller than our Sun.

Habitable Zone and Potential for Life

One of the most compelling aspects of LHS 1140 b is its location within the conservative habitable zone of its host star ²⁴. The habitable zone is the region around a star where conditions might be suitable for liquid water to exist on a planet's surface, a key ingredient for life as we know it.

While red dwarf stars can be prone to strong flares that could strip away a planet's atmosphere, LHS 1140 is considered a relatively "quiet" star. It bathes LHS 1140 b in only about 10 times the X-ray energy that streams towards Earth, which might not preclude the possibility of biology ¹⁰.

Atmospheric Discovery

A groundbreaking discovery in 2024 confirmed the presence of an atmosphere around LHS 1140 b ⁶⁷⁹. Researchers detected helium gas in the planet's upper atmospheric layers ⁶⁸. This was achieved by observing the LHS 1140 system when both LHS 1140 b and another planet, LHS 1140 c, transited their star ⁷. During LHS 1140 b's transit, scientists observed a drop in starlight brightness at a specific wavelength known to be absorbed by helium ⁷.

This finding is significant because:

• It marks the first atmosphere detected around a rocky exoplanet orbiting within its star's habitable zone ⁶⁹.
• The presence of an atmosphere is a crucial factor in a planet's ability to support life, as it can regulate temperature, protect against harmful radiation, and allow for the cycling of vital elements.
• The detection of helium provides valuable data for understanding the composition and evolution of exoplanet atmospheres, guiding future searches for biosignatures.

Ongoing Research

The discovery of an atmosphere on LHS 1140 b represents a major step forward in the search for life beyond Earth ⁶. Scientists continue to investigate this exoplanet to learn more about its atmospheric composition, temperature, and other conditions that could shed light on its potential for habitability ⁶. Further studies will likely focus on detecting other gases and understanding the dynamics of its atmosphere.