Astronomers Identified Star That Consumed Planets
Researchers found high levels of beryllium in a star, suggesting it swallowed at least 11 Earth masses of rocky material.
Updated on Sept. 20, 2026 in Space
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Scientists have determined that the star HD 129171 likely consumed a significant amount of planetary material, leaving behind a unique chemical signature. By comparing the star to its companion, HD 129209, researchers identified distinct differences in chemical composition that point to planetary engulfment.
Why it matters
Beryllium serves as a more durable indicator of planetary consumption than lithium, offering astronomers a reliable method to detect when stars have swallowed orbiting planets. This finding helps confirm that stars can significantly alter their surface chemistry through the destruction of nearby rocky bodies.
The star HD 129171 contains 1.6 times more beryllium, 30% more iron, and 10 times as much lithium as its companion, HD 129209. Data was captured using the UVES spectrograph on the Very Large Telescope in Chile.
The players
HD 129171
This star is a member of a binary system that has been found to possess anomalous levels of iron, lithium, and beryllium.
Very Large Telescope
Located in Chile, this major astronomical facility was used to record the light spectra of the star pair.
The details
The team modeled the chemical shifts and concluded that internal consumption, rather than initial formation differences, accounts for the chemical mismatch between the five-billion-year-old binary pair. By tracking beryllium signatures, researchers can better distinguish between primordial birth cloud variations and later planetary ingestion.
Timeline
A study first identified chemical differences in the star pair in 2021.
The findings were published on September 20, 2026.
The Big Picture
This discovery challenges the assumption that stellar composition is entirely determined by the birth cloud, proving that stars can fundamentally reshape their chemical makeup by consuming orbiting material. It shifts the paradigm from viewing stars as static objects to dynamic systems prone to planetary engulfment.
This study advances our understanding of how planetary systems evolve and potentially end their lives. By providing a new chemical marker for planetary consumption, scientists can more accurately map the long-term stability and life cycles of solar systems throughout the galaxy.
The takeaway
This discovery highlights that binary stars are not always chemical clones, as external factors like planetary ingestion can drastically change their surface makeup over billions of years. Understanding these signatures allows scientists to better reconstruct the violent histories of stars beyond our own solar system.
What happens next
The research team plans to conduct further searches for beryllium signatures in other mismatched stellar twins to determine how frequently planetary engulfment occurs in binary systems.
Further reading
For more on recent cosmic findings, visit the Space section.
Source note: This article includes information reported by Earth.
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