---
res:
  bibo_abstract:
  - 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" (Rp = 9.17 ± 0.33 R⊕) with an orbital period of ∼14.3 days,
    irradiance of F = 343 ± 24 F⊕, and moderate mass (Mp = 60.5 ± 5.7 M⊕) and density
    (ρp = 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.@eng
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      foaf_name: Kjeldsen, Hans
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      foaf_name: Christensen-Dalsgaard, Jørgen
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      foaf_name: Bedding, Timothy R.
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    orcid: 0000-0003-0142-4000
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      foaf_name: Schnaible, Chloe
      foaf_surname: Schnaible
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      foaf_givenName: David R.
      foaf_name: Soderblom, David R.
      foaf_surname: Soderblom
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      foaf_givenName: Róbert
      foaf_name: Szabó, Róbert
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      foaf_name: Tanner, Angelle
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      foaf_givenName: C. G.
      foaf_name: Tinney, C. G.
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      foaf_name: Teske, Johanna
      foaf_surname: Teske
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      foaf_givenName: Alexandra
      foaf_name: Thomas, Alexandra
      foaf_surname: Thomas
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      foaf_givenName: Regner
      foaf_name: Trampedach, Regner
      foaf_surname: Trampedach
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      foaf_givenName: Duncan
      foaf_name: Wright, Duncan
      foaf_surname: Wright
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      foaf_givenName: Thomas T.
      foaf_name: Yuan, Thomas T.
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  bibo_doi: 10.3847/1538-3881/ab1488
  bibo_issue: '6'
  bibo_volume: 157
  dct_date: 2019^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0004-6256
  dct_language: eng
  dct_publisher: IOP Publishing@
  dct_subject:
  - Space and Planetary Science
  - Astronomy and Astrophysics
  dct_title: A hot Saturn orbiting an oscillating late subgiant discovered by TESS@
...