Astronomers Link 6 Red Dwarfs to Consuming 3-10 Earth Masses of Planets
Updated
Updated · ScienceAlert · Jun 8
Astronomers Link 6 Red Dwarfs to Consuming 3-10 Earth Masses of Planets
2 articles · Updated · ScienceAlert · Jun 8
Summary
Six of 318 red dwarfs in Gaia-ESO survey data showed lithium levels too high to fit their age, pointing to recent planetary engulfment rather than normal stellar evolution.
Models indicate each star would need to swallow about 3 to 10 Earth masses of rocky material to produce the observed lithium signature, which low-mass stars normally destroy quickly.
Motion, color and rotation checks ruled out simpler explanations such as younger interloper stars, unusual magnetic activity or rapid spinning that might preserve lithium.
The six detections imply roughly 2% to 3% of sampled red dwarfs may have eaten planets, though the true rate could be higher if lithium fades fast from their atmospheres.
Because red dwarfs live for tens of billions to trillions of years and host many rocky worlds, the finding opens a new way to study how young planetary systems become dynamically unstable.
If stars eating their planets is common, what does this mean for the survival of Earth-like worlds?
Could the lithium in a star be the chemical ghost of a long-dead, Earth-like planet?
Did our own Sun devour a planet in its chaotic youth, hiding the evidence for billions of years?
Landmark Study Finds Red Dwarfs Engulf Rocky Worlds, Leaving Lithium Traces
Overview
A major study published in June 2026 revealed that red dwarf stars can engulf rocky, Earth-like planets. Astronomers made this discovery after observing unusually high levels of lithium—a fragile element—in the atmospheres of six young red dwarfs across three star clusters. Since lithium is easily destroyed inside stars, its presence suggests these stars recently consumed planetary material. This finding shows that planetary systems around red dwarfs can be dynamic and destructive, with planets sometimes spiraling into their host stars. The research provides new insights into how common and impactful such engulfment events are in shaping planetary systems.