"Debris disks" refer to the remnants of dust and rocks that surround certain stars in space, similar to how the debris and dust accumulate around a construction site. Full definition
In the past 2 decades, astronomers have detected infrared radiation from debris disks around several stars. (sciencemag.org)
Its presence in debris disks could mean that other gases, including hydrogen, are present, but perhaps in much lower concentrations. (sciencedaily.com)
For planets that are currently beyond reach of detection of our instruments and facilities, studying their impact on debris disks is actually our only chance to characterize them. (eos-nexus.org)