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

2021; Institute of Physics; Volume: 161; Issue: 5 Linguagem: Inglês

10.3847/1538-3881/abeaa1

1538-3881

Mélissa J. Hobson, Rafael Brahm, Andrés Jordán, Néstor Espinoza, D. Kossakowski, Thomas Henning, Felipe Rojas, Martin Schlecker, P. Sarkis, T. Trifonov, Daniel Thorngren, A. Binnenfeld, S. Shahaf, S. Zucker, G. Ricker, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Brett C. 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,

Astro and Planetary Science

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 ( <?CDATA ${0.87}_{-0.49}^{+0.46}\,\mathrm{Gyr}$?> ) and bright ( V = 9.07 mag) F-type star with a 52.9781 day period. The planet has a mass of <?CDATA ${0.42}_{-0.03}^{+0.05}\,{M}_{{\rm{J}}}$?> , a radius of <?CDATA ${1.008}_{-0.015}^{+0.012}\,{R}_{{\rm{J}}}$?> , and an orbital eccentricity of <?CDATA ${0.28}_{-0.09}^{+0.06};$?> 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.