A Transiting Warm Giant Planet around the Young Active Star TOI-201
Mélissa J. Hobson, Rafael Brahm, Andrés Jordán, Néstor Espinoza, D. Kossakowski, Thomas Henning, Felipe Rojas, Martin Schlecker, P. Sarkis, Trifon Trifonov, Daniel Thorngren, A. Binnenfeld, S. Shahaf, S. Zucker, G. Ricker, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Brett Addison, F. Bouchy, Brendan P. Bowler, Joshua T Briegal, Edward M. Bryant, Karen A. Collins, Tansu Daylan, Nolan Grieves, Jonathan Horner, Chelsea X. Huang, Stephen R. Kane, John F. Kielkopf, B. McLean, Matthew W. Mengel, Louise D. Nielsen, Jack Okumura, Matías Jones, Peter Plavchan, Avi Shporer, A. M. S. Smith, Rosanna Tilbrook, C. G. Tinney, Joseph D. Twicken, S. Udry, N. Unger, R. G. West, Robert A. Wittenmyer, Bill Wohler, P. Torres, D. J. Wright
Abstract
Abstract 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 ( ) and bright ( V = 9.07 mag) F-type star with a 52.9781 day period. The planet has a mass of , a radius of , and an orbital eccentricity of 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.