Spectroscopic Characterization of WD J000801.25-350450 and its Two Co-Moving Companions

TL;DR

This study spectroscopically characterizes a white dwarf and its two low-mass co-moving companions, revealing their spectral types and system configuration, and discusses the possibility of a quadruple system.

Contribution

First detailed spectroscopic analysis of WD J000801.25-350450 and its companions, identifying their spectral types and potential quadruple system nature.

Findings

White dwarf is a hydrogen-rich DA with T_eff=6200K and 0.63 M_sun.

Inner companion is an M8 dwarf.

Outer companion may be an M6 + M9 binary.

Abstract

We present new spectroscopic data for Gaia DR3 2309499817384726016 (WD0008-350A) and its two wide, co-moving, low-mass companions. We confirm the white dwarf is a hydrogen-rich DA, with T$_{\rm eff}$=6200$\pm$90~K and a mass of 0.63$\pm$0.03~M${\odot}$, close to that of the average white dwarf. Near-infrared spectra of the two stellar companions to WD0008-350A 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.