A transiting warm giant planet around the young active star TOI-201

Abstract

We present the confirmation of the eccentric warm giant planet TOI-201 b, first identified as a candidate in \textit{TESS} photometry (Sectors 1-8, 10-13, and 27-28) and confirmed using ground-based photometry from NGTS and radial velocities from FEROS, HARPS, CORALIE, and \textsc{Minerva}-Australis. TOI-201 b orbits a young ($0.87_{-0.49}^{+0.46}\mathrm{Gyr}$) and bright(V=9.07 mag) F-type star with a $52.9781\mathrm{d}$ period. The planet has a mass of $0.42_{-0.03}^{+0.05}{\mathrm{M}}_{\mathrm{J}}$, a radius of $1.008_{-0.015}^{+0.012}{\mathrm{R}}_{\mathrm{J}}$, and an orbital eccentricity of $0.28_{-0.09}^{+0.06}$; it appears to still be undergoing fairly rapid cooling, as expected given the youth of the host star. The star also shows long-term variability in both the radial velocities and several activity indicators, which we attribute to stellar activity. The discovery and characterization of warm giant planets such as TOI-201 b is important for constraining formation and evolution theories for giant planets.

21 pages, 11 figures, accepted to AJ

References in corpus (14)

• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• CERES: A Set of Automated Routines for Echelle Spectra
• Stellar activity of planetary host star HD 189733
• APASS Landolt-Sloan BVgri photometry of RAVE stars. I. Data, effective temperatures and reddenings
• ZASPE: A Code to Measure Stellar Atmospheric Parameters and their Covariance from Spectra
• Evidence of Three Mechanisms Explaining the Radius Anomaly of Hot Jupiters
• The Equilibrium Temperature of Planets in Elliptical Orbits
• Simultaneous TESS and NGTS Transit Observations of WASP-166b
• Theoretical vs. observational uncertainties: composition of giant exoplanets
• SOPHIE velocimetry of Kepler transit candidates XIV. A joint photometric, spectroscopic, and dynamical analysis of the Kepler-117 system
• USuRPER: Unit-Sphere Representation PERiodogram for full spectra

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