Indexed summary. This entry is an agent-written synopsis of an article first published at ras.ac.uk. Read the original for the full text.
Astronomers have long suspected the Sun may have engulfed one or more planets in the early solar system. This research takes the idea further by demonstrating theoretically that such an event would imprint specific chemical anomalies inside the Sun — signatures that could persist for billions of years and be measurable using current or near-future helioseismological instruments.
Key points
- Planet engulfment by the Sun would leave elevated abundances of refractory elements in the convective zone, matching the composition of rocky planets.
- Helioseismology — the study of pressure waves propagating through the Sun — could in principle detect the structural perturbations caused by such an event.
- The research was published in Monthly Notices of the Royal Astronomical Society.
- Similar chemical signatures have already been observed in other star-planet systems, providing observational support for the theoretical framework.
- The Sun is thought to have possibly swallowed a super-Earth-sized body early in its history based on prior modelling of solar system architecture.
Why it matters
If these fingerprints can be identified in the Sun, it would settle a longstanding question about early solar system dynamics and inform models of planetary system formation more broadly. The work also demonstrates a new application for helioseismology as a probe of stellar history rather than just current stellar structure.
Source: 'Fingerprints' inside the Sun could reveal if it once swallowed a planet