Overview
- A peer-reviewed study in The Astrophysical Journal Letters on March 11 details large visible-light dips paired with an infrared spike from the star Gaia20ehk (also called Gaia-GIC-1).
- Researchers model the signal as a hot rock-and-dust cloud from a catastrophic collision, estimating a mass approaching half that of Ceres and a temperature near 900 kelvins.
- The light curve showed three dips beginning in 2016 before extreme variability in 2021, a pattern consistent with grazing impacts culminating in a final smashup.
- Debris appears to orbit at roughly one astronomical unit from the star, inviting comparison to the hypothesized Earth–Moon–forming giant impact and its implications for habitability.
- The team notes that such collisions are rarely observed, credits archival-data sleuthing for the discovery, and says upcoming wide surveys like the Rubin Observatory could uncover many more.