An Ancient Brown Dwarf Transiting a Metal-Poor Thick Disk Star
J\'ea Adams Redai, Vedant Chandra, Samuel W. Yee, Victoria DiTomasso, Sean Andrews, Karin \"Oberg, Rebecca Woody, David W. Latham, Allyson Bieryla, Samuel N. Quinn, David Charbonneau, Theron W. Carmichael, Chih-Chun Hsu, Noah Vowell, Jason J. Wang, Sebastian Zieba, Paul Benni

TL;DR
This paper reports the discovery of TOI-7019b, the first transiting brown dwarf orbiting an ancient, metal-poor thick disk star, providing new insights into brown dwarf properties in low-metallicity environments.
Contribution
It presents the first known transiting brown dwarf around a metal-poor, ancient thick disk star, expanding the parameter space for brown dwarf studies and testing evolutionary models.
Findings
Brown dwarf mass: 61.3 ± 2.1 M_J
Orbital period: 48.2592 ± 0.0001 days
Radius larger than models predict by 12.3%
Abstract
We report the discovery of TOI-7019b, the first transiting brown dwarf (BD) known to orbit a star that is part of the Milky Way's ancient thick disk, as defined chemically ([Fe/H] dex, [/Fe] dex, [M/H] dex) and kinematically ( km s). We estimate a system age Gyr by fitting the host star's spectrum and spectral energy distribution to alpha-enhanced isochrones, and independently using the age-metallicity relation of the thick disk. This makes TOI-7019 by far the most metal-poor and ancient BD host known to date. We measure a BD mass of and radius of from a joint analysis of transit photometry and radial velocity measurements, along with an orbital period of days and an orbital eccentricity of…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Educational Leadership and Practices
