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An Ancient Brown Dwarf Transiting a Metal-poor Thick-disk Star

  • Authors: Jéa Adams Redai, Vedant Chandra, Samuel W. Yee, Victoria DiTomasso, Sean Andrews, Karin Öberg, David Charbonneau, Rebecca Woody, David W. Latham, Allyson Bieryla, Samuel N. Quinn, Theron W. Carmichael, Chih-Chun Hsu, Noah Vowell, Jason J. Wang, Sebastian Zieba, Paul Benni, Karen A. Collins, David R. Ciardi, Julian van Eyken, William Fong, Michael B. Lund, Andrei M. Tatarnikov

Jéa Adams Redai et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 1.

Left: Gaia XP metallicities from R. Andrae et al. (2023) for TOIs vs. the Galactocentric azimuthal velocity. The Sun is shown for reference. Whereas most TOIs are thin-disk stars in the solar neighborhood, TOI-7019 stands out as an extreme outlier in this space. Right: the Toomre diagram, showing the Galactocentric azimuthal velocity vs. the perpendicular (radial and vertical) velocity. Dashed lines indicate constant total Galactocentric velocity. TOI-7019 lies in a sparsely populated regime of the Toomre diagram typically associated with the kinematic thick disk.

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