Galactic population membership of WISEA J181006.18−101000.5

Ascertain whether WISEA J181006.18−101000.5 belongs to the thin disk or thick disk population by refining its kinematic measurements and membership diagnostics.

Background

From the newly derived heliocentric radial velocity and space motions, the authors infer that WISE1810 is more likely associated with the thick disk. However, due to remaining uncertainties, they cannot conclusively exclude thin disk membership.

Resolving the Galactic population membership has implications for interpreting the object’s metallicity, age, and formation history, particularly given its extreme metal-poor nature.

References

These values suggest that WISE1810 is more likely associated with the thick disk rather than the halo, despite its very low metallicity. However, the possibility of thin disk membership cannot be entirely ruled out, see Fig.\,12 of \citet{lodieu2022W1810} and Fig.\,17 of \citet{zhang2017six_sdL_classification}.

— Detection of Methane in the Closest Extreme Metal-poor T Dwarf WISEA J181006.18-101000.5 (2503.22289 - Zhang et al., 28 Mar 2025) in Section 4 (Radial Velocity and Galactic kinematics)