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+0.46Gyr) and bright(V=9.07 mag) F-type star with a 52.9781d period. The planet has a mass of 0.42−0.03+0.05MJ, a radius of 1.008−0.015+0.012RJ, 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.
@article{arxiv.2103.02685,
title = {A transiting warm giant planet around the young active star TOI-201},
author = {Melissa J. Hobson and Rafael Brahm and Andres Jordán and Nestor Espinoza and Diana Kossakowski and Thomas Henning and Felipe Rojas and Martin Schlecker and Paula Sarkis and Trifon Trifonov and Daniel Thorngren and Avraham Binnenfeld and Sahar Shahaf and Shay Zucker and George R. Ricker and David W. Latham and S. Seager and Joshua N. Winn and Jon M. Jenkins and Brett Addison and Francois Bouchy and Brendan P. Bowler and Joshua T. Briegal and Edward M. Bryant and Karen A. Collins and Tansu Daylan and Nolan Grieves and Jonathan Horner and Chelsea Huang and Stephen R. Kane and John Kielkopf and Brian McLean and Matthew W. Mengel and Louise D. Nielsen and Jack Okumura and Peter Plavchan and Avi Shporer and Alexis M. S. Smith and Rosanna Tilbrook and C. G. Tinney and Joseph D. Twicken and Stephane Udry and Nicolas Unger and Richard West and Robert A. Wittenmyer and Bill Wohler and Duncan J. Wright},
journal= {arXiv preprint arXiv:2103.02685},
year = {2021}
}