The phrase "dusty debris" refers to tiny pieces of dirt, particles, or waste that have collected and become covered in a thin layer of fine dust. Full definition
Other possibilities — such as intrinsic fluctuations in the star's luminosity or even a black hole with a cold and dusty debris disk drifting across our interstellar line of sight — could also still fit the data. (scientificamerican.com)
The debris field of very fine dust was likely created from collisions among developing infant planets near the star, evidenced by a bright ring of dusty debris seen 7 billion miles from the star. (sciencedaily.com)
The majority of these systems are unresolved and analysis of the dust properties is limited by the lack of information regarding the dust location.vThe Herschel DUNES key program is observing 133 nearby, Sun - like stars (< 20 pc, FGK spectral type) in a volume... ▽ More Dusty debris discs around main sequence stars are thought to be the result of continuous collisional grinding of planetesimals in the system. (arxiv.org)