A Reanalysis of the Fundamental Parameters and Age of TRAPPIST-1
Eileen C. Gonzales, Jacqueline K. Faherty, Jonathan Gagn\'e, Johanna, Teske, Andrew McWilliams, and Kelle L. Cruz

TL;DR
This study refines the fundamental parameters and age of TRAPPIST-1 using new spectral data and Gaia parallax, revealing it as a field-age star with subtle low-gravity spectral features possibly influenced by magnetic activity or planetary interactions.
Contribution
It provides updated physical parameters for TRAPPIST-1 and analyzes its spectral features, kinematics, and gravity indicators to clarify its age and nature, including new spectral indices and comparisons with similar objects.
Findings
TRAPPIST-1 has an effective temperature of 2628 K and a radius of 1.16 R_Jup.
Spectral analysis suggests TRAPPIST-1 is a field-age star with low-gravity features.
Kinematic data indicate an older age, contrasting with spectral youth indicators.
Abstract
We present the distance-calibrated spectral energy distribution (SED) of TRAPPIST-1 using a new medium resolution (R~6000) near-infrared FIRE spectrum and its Gaia parallax. We report an updated bolometric luminosity (Lbol) of -3.216+/-0.016, along with semi-empirical fundamental parameters: effective temperature Teff=2628+/-42 K, mass=90+/-8 MJup, radius=1.16+/-0.03 RJup, and logg=5.21+/-0.06 dex. It's kinematics point toward an older age while spectral indices indicate youth therefore, we compare the overall SED and near-infrared bands of TRAPPIST-1 to field-age, low-gravity, and low-metallicity dwarfs of similar Teff and Lbol. We find field dwarfs of similar Teff and Lbol best fit the overall and band-by-band features of TRAPPIST-1. Additionally, we present new Allers & Liu 2013 spectral indices for the SpeX SXD and FIRE spectra of TRAPPIST-1, both classifying it as intermediate…
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