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TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

DOI

  • Chen Jiang, Max Planck Institute for Solar System Research
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  • Tao Wu, Yunnan Observatories, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanxi University
    • ,
  • Adina D. Feinstein, University of Chicago
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  • Keivan G. Stassun, Vanderbilt University
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  • Timothy R. Bedding, University of Sydney
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  • Dimitri Veras, University of Warwick
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  • Enrico Corsaro, Osservatorio Astrofisico di Catania
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  • Derek L. Buzasi, Florida Gulf Coast University
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  • Dennis Stello
  • Yaguang Li, University of Sydney
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  • Savita Mathur, Instituto Astrofisico de Canarias, University of La Laguna
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  • Rafael A. García, Universite Paris-Saclay
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  • Sylvain N. Breton, Osservatorio Astrofisico di Catania, Universite Paris-Saclay
    • ,
  • Mia S. Lundkvist
  • Przemysław J. Mikołajczyk, University of Warsaw, University of Wroclaw
    • ,
  • Charlotte Gehan, Max Planck Institute for Solar System Research, University of Porto
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  • Tiago L. Campante, University of Porto
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  • Diego Bossini, University of Porto
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  • Stephen R. Kane, University of California at Riverside
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  • Jia Mian Joel Ong, Yale University
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  • Mutlu Yıldız, Ege University
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  • Cenk Kayhan
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  • Zeynep Çelik Orhan, Ege University
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  • Sibel Örtel, Ege University
    • ,
  • Xinyi Zhang
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  • Margarida S. Cunha, University of Porto
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  • Bruno Lustosa de Moura
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  • Jie Yu, Max Planck Institute for Solar System Research
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  • Daniel Huber, University of Hawaii at Manoa
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  • Jian Wen Ou
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  • Robert A. Wittenmyer
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  • Laurent Gizon, Max Planck Institute for Solar System Research
    • ,
  • William J. Chaplin, University of Birmingham

The Transiting Exoplanet Survey Satellite (TESS) mission searches for new exoplanets. The observing strategy of TESS results in high-precision photometry of millions of stars across the sky, allowing for detailed asteroseismic studies of individual systems. In this work, we present a detailed asteroseismic analysis of the giant star HD 76920 hosting a highly eccentric giant planet (e = 0.878) with an orbital period of 415 days, using five sectors of TESS light curve that cover around 140 days of data. Solar-like oscillations in HD 76920 are detected around 52 μHz by TESS for the first time. By utilizing asteroseismic modeling that takes classical observational parameters and stellar oscillation frequencies as constraints, we determine improved measurements of the stellar mass (1.22 ± 0.11 M ⊙), radius (8.68 ± 0.34 R ☉), and age (5.2 ± 1.4 Gyr). With the updated parameters of the host star, we update the semimajor axis and mass of the planet as a = 1.165 ± 0.035 au and M p sin i = 3.57 ± 0.22 M Jup . With an orbital pericenter of 0.142 ± 0.005 au, we confirm that the planet is currently far away enough from the star to experience negligible tidal decay until being engulfed in the stellar envelope. We also confirm that this event will occur within about 100 Myr, depending on the stellar model used.

OriginalsprogEngelsk
Artikelnummer20
TidsskriftAstrophysical Journal
Vol/bind945
Nummer1
Antal sider12
ISSN0004-637X
DOI
StatusUdgivet - mar. 2023

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