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A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS

2019; Institute of Physics; Volume: 157; Issue: 6 Linguagem: Inglês

10.3847/1538-3881/ab1488

1538-3881

Daniel Huber, W. J. Chaplin, Ashley Chontos, H. Kjeldsen, J. Christensen‐Dalsgaard, T. R. Bedding, Warrick H. Ball, Rafael Brahm, Néstor Espinoza, Thomas Henning, Andrés Jordán, P. Sarkis, Emil Knudstrup, Simon Albrecht, F. Grundahl, M. F. Andersen, P. L. Pallé, Ian J. M. Crossfield, Benjamin J. Fulton, Andrew W. Howard, Howard Isaacson, Lauren M. Weiss, R. Handberg, Mikkel N. Lund, Aldo Serenelli, Jakob Rørsted Mosumgaard, Amalie Stokholm, Allyson Bieryla, Lars A. Buchhave, David W. Latham, Samuel N. Quinn, Eric Gaidos, Teruyuki Hirano, G. Ricker, R. Vanderspek, Sara Seager, Jon M. Jenkins, Joshua N. Winn, H. M. Antia, T. Appourchaux, Sarbani Basu, Keaton J. Bell, O. Benomar, A. Bonanno, Derek L. Buzasi, T. L. Campante, Zeynep Çelik Orhan, E. Corsaro, M. S. Cunha, G. R. Davies, S. Deheuvels, Samuel K. Grunblatt, A. Hasanzadeh, M. P. Di Mauro, R. A. García, P. Gaulme, L. Girardi, Joyce Ann Guzik, Marc Hon, Chen Jiang, T. Kallinger, S. D. Kawaler, James S. Kuszlewicz, Y. Lebreton, Tanda Li, Miles Lucas, M. Lundkvist, Andrew W. Mann, Stéphane Mathis, S. Mathur, A. Mazumdar, Τ. S. Metcalfe, A. Miglio, M. J. P. F. G. Monteiro, B. Mosser, A. Noll, Benard Nsamba, J. M. Joel Ong, Sibel Örtel, Filipe Pereira, Pritesh Ranadive, C. Régulo, Thaíse S. Rodrigues, I. W. Roxburgh, V. Silva Aguirre, B. Smalley, Mathew Schofield, S. G. Sousa, Keivan G. Stassun, Dennis Stello, Jamie Tayar, T. R. White, Kuldeep Verma, Mathieu Vrard, Mutlu Yıldız, David Baker, M. Bazot, C. Beichmann, Christoph Bergmann, L. Bugnet, Bryson Cale, Roberto Carlino, Scott Cartwright, Jessie L. Christiansen, David R. Ciardi, O. L. Creevey, Jason Dittmann, J.-D. do Nascimento, Vincent Van Eylen, Gábor Fűrész, Jonathan Gagné, Peter Gao, K. Gazeas, Frank Giddens, Oliver J. Hall, S. Hekker, Michael Ireland, Natasha Latouf, Danny LeBrun, Alan M. Levine, William Matzko, E. Natinsky, Emma Page, Peter Plavchan, Masoud Mansouri-Samani, Sean McCauliff, Susan E. Mullally, Brendan J. Orenstein, Aylin García Soto, Martin Paegert, Jennifer L. van Saders, C. Schnaible, David R. Soderblom, R. Szabó, Angelle Tanner, C. G. Tinney, Johanna Teske, Alexandra Thomas, Regner Trampedach, D. J. Wright, Thomas T. Yuan, Farzaneh Zohrabi,

Astrophysics and Star Formation Studies

We present the discovery of TOI-197.01, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. TOI-197 (HIP116158) is a bright (V=8.2 mag), spectroscopically classified subgiant which oscillates with an average frequency of about 430 muHz and displays a clear signature of mixed modes. The oscillation amplitude confirms that the redder TESS bandpass compared to Kepler has a small effect on the oscillations, supporting the expected yield of thousands of solar-like oscillators with TESS 2-minute cadence observations. Asteroseismic modeling yields a robust determination of the host star radius (2.943+/-0.064 Rsun), mass (1.212 +/- 0.074 Msun) and age (4.9+/-1.1 Gyr), and demonstrates that it has just started ascending the red-giant branch. Combining asteroseismology with transit modeling and radial-velocity observations, we show that the planet is a "hot Saturn" (9.17+/-0.33 Rearth) with an orbital period of ~14.3 days, irradiance of 343+/-24 Fearth, moderate mass (60.5 +/- 5.7 Mearth) and density (0.431+/-0.062 gcc). The properties of TOI-197.01 show that the host-star metallicity - planet mass correlation found in sub-Saturns (4-8 Rearth) does not extend to larger radii, indicating that planets in the transition between sub-Saturns and Jupiters follow a relatively narrow range of densities. With a density measured to ~15%, TOI-197.01 is one of the best characterized Saturn-sized planets to date, augmenting the small number of known transiting planets around evolved stars and demonstrating the power of TESS to characterize exoplanets and their host stars using asteroseismology.