Infrared Excesses Around Bright White Dwarfs from Gaia and unWISE. II

Infrared excesses around white dwarf stars indicate the presence of various astrophysical objects interest, including companions and debris disks. In this second paper a series, we present follow-up observations infrared excess candidates from Gaia unWISE discussed in first paper, Paper I. We report space-based photometry at 3.6 4.5 micron for 174 dwarfs Spitzer Space Telescope ground-based near-infrared J, H, K 235 Gemini Observatory with significant overlap between observations. These data are used to confirm or rule out observed excess. From unWISE-selected candidate sample, most promising sample comes both color flux excess, which has confirmation rate 95%. also discuss method distinguish caused by stellar sub-stellar potential dust total, 62 dwarfs, 10 likely be companions. The remaining 52 bright beyond two microns double known dusty exoplanetary Follow-up high-resolution spectroscopic studies fraction confirmed have discovered emission gaseous Additional investigations will able expand parameter space disks found.