TESS Hunt for Young and Maturing Exoplanets (THYME) XIV: A Comoving-Based Age Constraint for KELT-20

Adam Distler; Melinda Soares-Furtado; Andrew W. Mann; Adam L. Kraus; Jonathan Gagné; Juliette Becker; Ritvik Sai Narayan; Max Clark; Andrew Vanderburg; Joseph E. Rodriguez; Laura K. Rogers; Ronan Kerr

arXiv · 2603.01313

TESS Hunt for Young and Maturing Exoplanets (THYME) XIV: A Comoving-Based Age Constraint for KELT-20

Adam Distler·Melinda Soares-Furtado·Andrew W. Mann·Adam L. Kraus·Jonathan Gagné·Juliette Becker·Ritvik Sai Narayan·Max Clark·Andrew Vanderburg·Joseph E. Rodriguez·Laura K. Rogers·Ronan Kerr

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Abstract

Young stellar moving groups offer unique opportunities to investigate the early evolution of stellar and planetary systems. In continuation of an ongoing effort to age-date compelling planetary systems, we provide an in-depth age analysis of KELT-20, a young A-type star that hosts a well-aligned ultra-hot Jupiter. This system poses a useful case study to investigate migration mechanisms at early stages of evolution. Using Gaia DR3 data, we identify 77 stars with proper motions consistent with KELT-20, including 19 with measured radial velocities that enable full 3D kinematic confirmation. Using isochronal analyses, gyrochronology, photometric variability, and stellar activity indicators, we converge on an age of $58 \pm 5\,$Myr. This constraint provides critical insights into the dynamical processes shaping hot Jupiter formation.

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Adam Distler, Melinda Soares-Furtado, Andrew W. Mann, Adam L. Kraus, Jonathan Gagné, Juliette Becker, Ritvik Sai Narayan, Max Clark, Andrew Vanderburg, Joseph E. Rodriguez, Laura K. Rogers, Ronan Kerr. 2026-03-01. TESS Hunt for Young and Maturing Exoplanets (THYME) XIV: A Comoving-Based Age Constraint for KELT-20. https://arxiv.org/abs/2603.01313

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