Infrared Excesses around Bright White Dwarfs from Gaia and unWISE. II
Samuel Lai, Erik Dennihy, Siyi Xu, Atsuko Nitta, Scot Kleinman, S.K., Leggett, Amy Bonsor, Simon Hodgkin, Alberto Rebassa-Mansergas, and Laura K., Rogers

TL;DR
This study confirms infrared excesses around white dwarfs using space and ground-based observations, identifying potential debris disks and companions, and enhances the sample of white dwarfs with dusty disks for further study.
Contribution
It provides a large, confirmed sample of white dwarfs with infrared excesses, distinguishing between dust disks and stellar companions, and introduces a method for such differentiation.
Findings
Confirmed infrared excess around 62 white dwarfs.
95% confirmation rate for candidate excesses from unWISE data.
Potential to double the known sample of white dwarfs with dusty debris disks.
Abstract
Infrared excesses around white dwarf stars indicate the presence of various astrophysical objects of interest, including companions and debris disks. In this second paper of a series, we present follow-up observations of infrared excess candidates from Gaia and unWISE discussed in the first paper, Paper I. We report space-based infrared photometry at 3.6 and 4.5 micron for 174 white dwarfs from the Spitzer Space Telescope and ground-based near-infrared J, H, and K photometry of 235 white dwarfs from Gemini Observatory with significant overlap between Spitzer and Gemini observations. This data is used to confirm or rule-out the observed unWISE infrared excess. From the unWISE-selected candidate sample, the most promising infrared excess sample comes from both colour and flux excess, which has a Spitzer confirmation rate of 95%. We also discuss a method to distinguish infrared excess…
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