4.6 Article

A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS

期刊

ASTRONOMICAL JOURNAL
卷 157, 期 6, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/ab1488

关键词

asteroseismology; techniques: photometric; planets and satellites: individual (HD 221416 b); stars: fundamental parameters; planets and satellites: fundamental parameters

资金

  1. National Aeronautics and Space Administration through the TESS Guest Investigator Program [80NSSC18K1585]
  2. National Science Foundation [AST-1717000]
  3. Science and Technology Facilities Council
  4. UK Space Agency
  5. European Social Fund via the Lithuanian Science Council [09.3.3-LMT-K-712-01-0103]
  6. Danish National Research Foundation [DNRF106]
  7. FONDECYT project [1171208]
  8. CONICYT project [BASAL AFB-170002]
  9. Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio [IC 120009]
  10. FONDECYT [3180246]
  11. Millennium Institute of Astrophysics (MAS)
  12. MINECO [ESP2017-82674-R]
  13. AGAUR [SGR2017-1131]
  14. PLATO grant from the CNES
  15. European Research Council under the European Community's Seventh Framework Programme (FP72007-2013) ERC grant [338251]
  16. European Research Council through the SPIRE grant [647383]
  17. FCT (Portugal)
  18. FEDER through COMPETE2020 [UID/FIS/04434/2013, POCI-01-0145-FEDER-007672, PTDC/FIS-AST/30389/2017, POCI-01-0145-FEDER-030389]
  19. European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [792848]
  20. European Union [664931]
  21. Independent Research Fund Denmark [7027-00096B]
  22. Australian Research Council
  23. NASA [NNX16AI09G, AS5-26555]
  24. NSF [AST-1514676]
  25. Australian Research Council [DP150100250]
  26. ERC [772293]
  27. Ramon y Cajal fellowship [RYC-2015-17697]
  28. Carlsberg Foundation [CF17-0760]
  29. HBCSE-NIUS programme
  30. NASA through Hubble Fellowship grants - Space Telescope Science Institute [HST-HF2-51399.001, HST-HF2-51424.001]
  31. Premiale 2015 MITiC
  32. NKFIH [K-115709]
  33. Lendulet Program of the Hungarian Academy of Sciences [LP2018-7/2018]
  34. NASA's Science Mission directorate
  35. STFC [2046401] Funding Source: UKRI

向作者/读者索取更多资源

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 mu Hz 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-circle dot), mass (M-* = 1.212 +/- 0.074 M-circle dot), 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-circle plus) with an orbital period of similar to 14.3 days, irradiance of F = 343 +/- 24 F-circle plus, and moderate mass (M-p = 60.5 +/- 5.7 M-circle plus) and density (rho(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-circle plus) 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 similar 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.

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