Roughly half of the stars selected for the study had previously shown no signs of cool dust circling in their outer reaches. (keckobservatory.org)
The background image has been recorded by the Spitzer Space Telescope in the infrared, showing emission from cool dust. (space.com)
We decompose the 3 - 160 um spectral energy distributions of the surrounding ISM structure into PAH as well as warm and cool dust components with the help of 2.5 - 5 um spectra. (arxiv.org)