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

/ Authors

M. Hobson, R. Brahm, A. Jord'an, N. Espinoza, D. Kossakowski, T. Henning, F. Rojas, M. Schlecker, P. Sarkis, T. Trifonov

and 93 more authors

D. Thorngren, A. Binnenfeld, S. Zucker, G. Ricker, D. Latham, S. Seager, J. Winn, J. Jenkins, B. Addison, F. Bouchy, B. Bowler, J. Briegal, E. Bryant, K. Collins, T. Daylan, N. Grieves, J. Horner, Chelsea X. Huang, S. Kane, J. Kielkopf, B. McLean, Matthew Nielsen, J. Okumura, P. Plavchan, Avi Shporer, Alexis M. S. Smith, R. Tilbrook, C. Tinney, J. Twicken, S. Udry, N. Unger, R. West, R. Wittenmyer, B. Wohler, D. M. T. C. F. Astrophysics, Chile., I. D. Astrofisica, F. Fisica, P. U. C. D. Chile, F. Ciencias, Universidad Adolfo Ibáñez, Space Telescope Science Institute, Usa, M. Astronomie, H Germany, U. Montreal, Canada., P. S. O. T. Environment, Earth Sciences, Raymond, Beverly Sackler Faculty of Exact Sciences, T. University, Israel, S. O. Physics, Astronomy, D. Physics, Kavli Institute for Astrophysics, Space Research, M. I. O. Technology, C. F. A. HarvardSmithsonian, D. O. Earth, Atmospheric, Planetary Sciences, Department of Aeronautics, Astronautics, Mit, D. Sciences, P. University, N. R. Center, U. Queensland, Centre for Gravitational Astrophysics, Australia., G. Observatory, U. Geneva, Switzerland., D. O. Astronomy, T. U. O. T. A. Austin, A. Group, C. Laboratory, UK., U. Warwick, Centre for Exoplanets, Habitability, Kavli Fellow, U. California, U. Louisville, Mikulski Archive for Space Telescopes, George Mason University, Institute of planetary Research, German Aerospace Center, U. Leicester, Exoplanetary Science at Unsw, Seti Institute

/ 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.

Journal: The Astronomical Journal

DOI: 10.3847/1538-3881/abeaa1