A Transiting Warm Giant Planet around the Young Active Star TOI-201

Melissa J. Hobson*, Rafael Brahm, Andrés Jordán, Nestor Espinoza, Diana Kossakowski, Thomas Henning, Felipe Rojas, Martin Schlecker, Paula Sarkis, Trifon Trifonov, Daniel Thorngren, Avraham Binnenfeld, Sahar Shahaf, Shay Zucker, George R. Ricker, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Brett AddisonFrançois Bouchy, Brendan P. Bowler, Joshua T. Briegal, Edward M. Bryant, Karen A. Collins, Tansu Daylan, Nolan Grieves, Jonathan Horner, Chelsea Huang, Stephen R. Kane, John Kielkopf, Brian McLean, Matthew W. Mengel, Louise D. Nielsen, Jack Okumura, Matias Jones, Peter Plavchan, Avi Shporer, Alexis M.S. Smith, Rosanna Tilbrook, C. G. Tinney, Joseph D. Twicken, Stéphane Udry, Nicolas Unger, Richard West, Robert A. Wittenmyer, Bill Wohler, Pascal Torres, Duncan J. Wright

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


We present the confirmation of the eccentric warm giant planet TOI-201 b, first identified as a candidate in Transiting Exoplanet Survey Satellite photometry (Sectors 1-8, 10-13, and 27-28) and confirmed using ground-based photometry from Next Generation Transit Survey and radial velocities from FEROS, HARPS, CORALIE, and Minerva-Australis. TOI-201 b orbits a young (0.87-0.49+0.46, Gyr) and bright (V = 9.07 mag) F-type star with a 52.9781 day period. The planet has a mass of 0.42-0.03+0.05, MJ, a radius of 1.008-0.015+0.012, RJ, 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 are important for constraining formation and evolution theories for giant planets.

Original languageEnglish
Article number235
JournalAstronomical Journal
Issue number5
StatePublished - May 2021


FundersFunder number
Horizon 2020 Framework Programme832428
Horizon 2020 Framework Programme


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