A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS

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  • Daniel Huber, Institute for Astronomy, University of Hawai‘i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA huberd@hawaii.edu 0000-0001-8832-4488
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  • William J. Chaplin, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 0000-0002-5714-8618
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  • Ashley Chontos, 0000-0003-1125-2564
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  • Hans Kjeldsen
  • Jørgen Christensen-Dalsgaard
  • Timothy R. Bedding, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark, Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia 0000-0001-5222-4661
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  • Warrick Ball, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 0000-0002-4773-1017
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  • Rafael Brahm, Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile 0000-0002-9158-7315
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  • Nestor Espinoza, Max-Planck-Institut fur Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany 0000-0001-9513-1449
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  • Thomas Henning, Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
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  • Andrés Jordán, Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile 0000-0002-5389-3944
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  • George R. Ricker, Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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  • Sara Seager, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA 0000-0002-6892-6948
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  • Jon M. Jenkins, NASA Ames Research Center, Moffett Field, CA 94035, USA 0000-0002-4715-9460
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  • Joshua N. Winn, Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA 0000-0002-4265-047X
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  • H. M. Antia, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India 0000-0001-7549-9684
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  • Thierry Appourchaux, Univ. Paris-Sud, Institut d’Astrophysique Spatiale, UMR 8617, CNRS, Bâtiment 121, F-91405 Orsay Cedex, France 0000-0002-1790-1951
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  • Sarbani Basu, Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA 0000-0002-6163-3472
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  • Keaton J. Bell, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark, Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077, Göttingen, Germany 0000-0002-0656-032X
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  • Derek L. Buzasi, Department of Chemistry & Physics, Florida Gulf Coast University, 10501 FGCU Boulevard S., Fort Myers, FL 33965, USA 0000-0002-1988-143X
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  • Tiago L. Campante, Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal, Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, s/n, PT4169-007 Porto, Portugal 0000-0002-4588-5389
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  • Z. Çelik Orhan, Department of Astronomy and Space Sciences, Science Faculty, Ege University, 35100, Bornova, İzmir, Turkey
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  • Margarida S. Cunha, Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal mcunha@astro.up.pt 0000-0001-8237-7343
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  • Guy R. Davies, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 0000-0002-4290-7351
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  • Sebastien Deheuvels, IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
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  • Samuel K. Grunblatt, Institute for Astronomy, University of Hawai‘i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 0000-0003-4976-9980
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  • Amir Hasanzadeh, Department of Physics, University of Zanjan, Zanjan, Iran
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  • Maria Pia Di Mauro, INAF-IAPS, Istituto di Astrofisica e Planetologia Spaziali, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy 0000-0001-7801-7484
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  • Rafael A. García, AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, France 0000-0002-8854-3776
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  • Patrick Gaulme, Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077, Göttingen, Germany 0000-0001-8330-5464
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  • Léo Girardi, Osservatorio Astronomico di Padova—INAF, Vicolo dellOsservatorio 5, I-35122 Padova, Italy 0000-0002-6301-3269
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  • Joyce A. Guzik, Los Alamos National Laboratory, XTD-NTA, MS T-082, Los Alamos, NM 87545, USA 0000-0003-1291-1533
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  • Marc Hon, School of Physics, The University of New South Wales, Sydney NSW 2052, Australia 0000-0003-2400-6960
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  • Chen Jiang, School of Physics and Astronomy, Sun Yat-Sen University, Guangzhou, 510275, People’s Republic of China
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  • Thomas Kallinger, Institute of Astrophysics, University of Vienna, Türkenschanzstrasse 17, Vienna 1180, Austria 0000-0003-3627-2561
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  • Steven D. Kawaler, Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA 0000-0002-6536-6367
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  • James S. Kuszlewicz, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark, Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany
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  • Yveline Lebreton, Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)—UMR 6251, F-35000 Rennes, France
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  • Tanda Li, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark, Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia 0000-0001-6396-2563
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  • Miles Lucas, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
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  • Mia S. Lundkvist
  • Andrew W. Mann, Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA 0000-0003-3654-1602
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  • Stéphane Mathis, AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, France
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  • Savita Mathur, Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain 0000-0002-0129-0316
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  • Mário J. P. F. G. Monteiro, Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, s/n, PT4169-007 Porto, Portugal 0000-0003-0513-8116
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  • Benoit Mosser, LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, F-92195 Meudon cedex, France 0000-0002-7547-1208
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  • Anthony Noll, IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
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  • Benard Nsamba, Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, s/n, PT4169-007 Porto, Portugal 0000-0002-4647-2068
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  • Jia Mian Joel Ong, Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA 0000-0001-7664-648X
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  • S. Örtel, Department of Astronomy and Space Sciences, Science Faculty, Ege University, 35100, Bornova, İzmir, Turkey
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  • Filipe Pereira, Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, s/n, PT4169-007 Porto, Portugal 0000-0002-2157-7146
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  • Pritesh Ranadive, Homi Bhabha Centre for Science Education, TIFR, V.N. Purav Marg, Mankhurd, Mumbai 400088, India
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  • Clara Régulo, Departamento de Astrofísica, Universidad de La Laguna, (ULL), E-38206 La Laguna, Tenerife, Spain
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  • Thaíse S. Rodrigues, Osservatorio Astronomico di Padova—INAF, Vicolo dellOsservatorio 5, I-35122 Padova, Italy 0000-0002-9414-339X
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  • Ian W. Roxburgh, Astronomy Unit, Queen Mary University of London, Mile End Road, London, E1 4NS, UK 0000-0002-7403-2764
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  • Victor Silva Aguirre
  • Barry Smalley, Astrophysics Group, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG, UK 0000-0002-3456-087X
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  • Mathew Schofield, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 0000-0002-5742-0247
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  • Sérgio G. Sousa, Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal 0000-0001-9047-2965
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  • Keivan G. Stassun, Vanderbilt Initiative in Data-intensive Astrophysics (VIDA), 6301 Stevenson Center Lane, Nashville, TN 37235, USA 0000-0002-3481-9052
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  • Dennis Stello
  • Jamie Tayar, Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA 0000-0002-4818-7885
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  • Timothy R. White, Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia 0000-0002-6980-3392
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  • Mathieu Vrard, Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
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  • M. Yıldız, Department of Astronomy and Space Sciences, Science Faculty, Ege University, 35100, Bornova, İzmir, Turkey
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  • David Baker, Physics Department, Austin College, Sherman, TX 75090, USA 0000-0002-2970-0532
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  • Charles Beichmann, Caltech/IPAC-NASA Exoplanet Science Institute, Pasadena, CA 91125, USA
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  • Christoph Bergmann, Exoplanetary Science at UNSW, School of Physics, UNSW Sydney, NSW 2052, Australia
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  • Bryson Cale, Department of Physics and Astronomy, George Mason University 4400 University Avenue, Fairfax, VA 22030, USA
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  • Jason A. Dittmann, Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 0000-0001-7730-2240
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  • Jose-Dias, Jr. Do Nascimento, Univ. Federal do Rio G. do Norte, UFRN, Dep. de Física, CP 1641, 59072-970, Natal, RN, Brazil 0000-0001-7804-2145
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  • Vincent Van Eylen, Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA
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  • Gabor Fürész, Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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  • Jonathan Gagné, Carnegie Institution of Washington DTM, 5241 Broad Branch Road NW, Washington, DC 20015, USA 0000-0002-2592-9612
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  • Frank Giddens, Department of Political Science, Missouri State University, USA.
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  • Oliver J. Hall, School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 0000-0002-0468-4775
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  • Martin Paegert, Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 0000-0001-8120-7457
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  • David R. Soderblom, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21212, USA 0000-0002-0322-8161
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  • Róbert Szabó, MTA CSFK Lendület Near-Field Cosmology Research Group 0000-0002-3258-1909
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  • Angelle Tanner, Mississippi State University, Department of Physics & Astronomy, Hilbun Hall, Starkville, MS 39762, USA
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  • C. G. Tinney, Exoplanetary Science at UNSW, School of Physics, UNSW Sydney, NSW 2052, Australia 0000-0002-7595-0970
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  • Johanna Teske, The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
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  • Alexandra Thomas, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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  • Regner Trampedach, Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark, Space Science Institute, 4750 Walnut street Suite# 205, Boulder, CO, 80301, USA
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  • Duncan Wright, University of Southern Queensland, Toowoomba, Qld 4350, Australia
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  • Thomas T. Yuan, Physics Department, Austin College, Sherman, TX 75090, USA
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  • Farzaneh Zohrabi, Mississippi State University, Department of Physics & Astronomy, Hilbun Hall, Starkville, MS 39762, USA
We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V = 8.2 mag), spectroscopically classified subgiant that oscillates with an average frequency of about 430 μHz 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 (R ⋆ = 2.943 ± 0.064 R ⊙), mass (M ⋆ = 1.212 ± 0.074 M ⊙), 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” (R p = 9.17 ± 0.33 R ⊕) with an orbital period of ∼14.3 days, irradiance of F = 343 ± 24 F ⊕, and moderate mass (M p = 60.5 ± 5.7 M ⊕) and density (ρ p = 0.431 ± 0.062 g cm‑3). The properties of HD 221416 b show that the host-star metallicity–planet mass correlation found in sub-Saturns (4–8 R ⊕) 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%, HD 221416 b is one of the best characterized Saturn-size 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.
Original languageEnglish
JournalThe Astronomical Journal
Volume157
Issue6
Pages (from-to)245
ISSN0004-6256
DOIs
Publication statusPublished - 1 Jun 2019
Externally publishedYes

    Research areas

  • asteroseismology, techniques: photometric, planets and satellites: individual: HD 221416 b, stars: fundamental parameters, planets and satellites: fundamental parameters

See relations at Aarhus University Citationformats

ID: 166623026