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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 4.

The observational H-R diagram—effective temperature vs. surface gravity—showing the UberMS fit to TOI-7019’s TRES spectrum and broadband photometry. Black contours delineate the 1σ–3σ statistical error regimes. The R. Andrae et al. (2023) measurement using low-resolution Gaia XP data is also shown. Gaia XP metallicities have a reported uncertainty of 0.1 dex (R. Andrae et al. 2023). MIST isochrones are overlaid for a range of stellar ages, with other parameters fixed to the adopted values for TOI-7019.

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