the.com/infrared excess
a star wearing more infrared than its temperature can explain — usually because it's hiding dust.
means an observed surplus of infrared radiation from an object beyond what its blackbody temperature predicts, typically signaling circumstellar dust that absorbs starlight and re-emits it as heat.
from emerged from mid-20th-century infrared astronomy once detectors could finally see past visible light; astronomers noticed some stars glowed suspiciously bright in the IR, and traced it to warm dust grains orbiting nearby.
debris disksclassic sign of planet-forming or post-collision dust rings
vega phenomenonnamed after vega, first star found with this excess
temperature cluedust temperature reveals how far it orbits the star
young starsoften means a protoplanetary disk still under construction