Journal ArticleSpectroscopic Characterization of WD J000801.25-350450 and Its Two Comoving CompanionsJałowiczor, Peter A (ORCID:000000024175295X); Bickle, Thomas P (ORCID:000000032235761X); Kirkpatrick, J Davy (ORCID:000000034269260X); Casewell, Sarah L (ORCID:0000000324780120); Gentile_Fusillo, Nicola (ORCID:0000000264284378); Schneider, Adam C (ORCID:0000000262945937); Gagné, Jonathan (ORCID:0000000225929612); Faherty, Jacqueline K (ORCID:0000000162510573); Meisner, Aaron M (ORCID:0000000211257384); Kuchner, Marc J (ORCID:0000000223875489); Burgasser, Adam J (ORCID:0000000265239536); Rothermich, Austin (ORCID:0000000340839962); Bravo, Alexia (ORCID:0009000239368059); Hyogo, Michiharu (ORCID:0000000183430820); Popinchalk, Mark (ORCID:0000000194827794); Brown, Alex J (ORCID:0000000233167240); Rebassa-Mansergas, Alberto (ORCID:0000000261537173); Murillo-Ojeda, Raquel (ORCID:0009000285780765)The_Backyard_Worlds_Planet_9_Collaboration<title>Abstract</title> <p>We present new spectroscopic data for Gaia DR3 2309499817384726016 (WD 0008-350A) and its two wide, comoving, low-mass companions. We confirm the white dwarf is a hydrogen rich DA, with<italic>T</italic>_eff= 6200 ± 90 K and a mass of 0.63 ± 0.03<italic>M</italic>_⊙, close to that of the average white dwarf. Near-infrared spectra of the two stellar companions to WD 0008-350A reveal that the inner companion is an M dwarf, exhibiting a spectral type of M8. Furthermore, the outer companion is identified as a possible M6 + M9 binary. This paper examines the evidence which suggests the system may be quadruple.</p>The Astronomical Journal2026-02-1810674131The Astronomical Journal17131710004-6256https://doi.org/10.3847/1538-3881/ae38d32238468National Science Foundation