Infrared excess
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Denebola shows a strong infrared excess, which means there must be a disk of cool dust in orbit around it.
This indicates that the infrared excesses seen around Vega and Fomalhaut are likely due to a disk of debris from colliding planetesimals rather than a protoplanetary disk.
Infrared excesses around stars are common (around 15 percent of all stars), but direct images are quite rare -- obtained in barely a handful of cases thus far.
Dust emission produces an infrared excess in the spectrum. Recombination itself produces a Lyman-alpha emission line.
A peculiar cM3e irregular variable with an extremely strong infrared excess, presumably due to a circumstellar dust shell. It is a class 2b OH emitter, and CO and H2O have been identified in its spectrum.
An infrared excess was discovered about the star in 1983 when the Infrared Astronomical Satellite (IRAS) observed it. This is indicative of dust surrounding the star, and planets might form from this disk.
We could try things like looking for infrared excess in stars from Dyson swarms, or use radar and see if we can find any [alien probes] hiding in Earth's Lagrangian points.
- this image sequence shows a set of nearby mergers in the order in which they best match the order of things seen in numerical simulations. It is especially interesting that this same order makes sense for optical colors and far-infrared excess, ...
 See also: Dust, Infrared, Star, Astronomy, Temperature
  
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