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Discovery and characterisation of black holes (BHs), neutron stars (NSs), andwhite dwarfs (WDs) with detached luminous companions (LCs) in wide orbits areexciting because they are important test beds for dark remnant (DR) formationphysics as well as binary stellar evolution models. Recently, 187 candidateshave been identified from Gaia's non-single star catalog as wide orbit(P_orb/days>45), detached binaries hosting DRs. We identify UV counterparts for49 of these sources in the archival GALEX data. Modeling the observed spectralenergy distribution (SED) spanning FUV-NUV to IR for these sources and stellarevolution models, we constrain the LC properties including mass, bolometricluminosity, and effective temperature for these 49 sources. Using the LCmasses, and the astrometric mass function constrained by Gaia, we constrain theDR masses for these sources. We find that 9 have masses clearly in the NS or BHmass range. Fifteen sources exhibit significant NUV excess and 4 show excessboth in FUV and NUV. The simplest explanation for these excess UV fluxes isthat the DRs in these sources are WDs. Using SED modeling we constrain theeffective temperature and bolometric luminosity for these 15 sources. Ourestimated DR masses for all of these 15 sources are lower than theChandrasekhar mass limit for WDs. Interestingly, five of these sources had beenwrongly identified as neutron stars in literature.

White Dwarfs Revealed in Gaia's Candidate Compact Object Binaries