Study finds nearly a third of Sun-like stars may host remnants of rocky planets

Recent research indicates that nearly a third of Sun-like stars may contain remnants of rocky planets, known as ultra-short-period (USP) planets. These stars show significant differences in metallicity, suggesting that engulfed rocky planets contribute to this variation. Astronomers have developed new models to explain how these planets, which orbit very close to their stars, can be consumed. The study suggests that the engulfment of these planets occurs within 0.1 to 1 billion years after their formation. The findings propose a link between the presence of USP planets and the metallicity pollution in stars. However, the authors note that the actual percentage of polluted stars could be higher than previously thought, as the signatures of metallicity can fade over time.