Study classifies extreme debris disk minerals

Science

Tech Times

Using the James Webb Space Telescope's MIRI instrument, researchers analyzed mid-infrared spectra of 21 extreme debris disks and identified two mineralogical classes: silica-rich disks that peak near 9–9.5 micrometers and forsterite-dominated disks that peak nearer 9.9–11.3 micrometers. About 38 percent of systems were silica-rich and all lay around stars younger than roughly 300 million years, implying giant, vaporizing impacts occur early and briefly. The remaining silica-poor systems appear across wider ages and show erratic brightness, possibly reflecting ongoing smaller collisions or orbital instability; Webb can expand the sample to confirm these patterns.

Silica-rich disks occur only around stars younger than about 300 million years.