TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet
Article
Article Title | TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Jiang, Chen, Wu, Tao, Feinstein, Adina D., Stassun, Keivan G., Bedding, Timothy R., Veras, Dimitri, Corsaro, Enrico, Buzasi, Derek L., Stello, Dennis, Li, Yaguang, Mathur, Savita, Garcia, Rafael A., Breton, Sylvain N., Lundkvist, Mia S., Mikolajczyk, Przemyslaw, Gehan, Charlotte, Campante, Tiago L., Bossini, Diego, Kane, Stephen R., Ong, Jia Mian, Yildiz, Mutlu, Kayhan, Cenk, Orhan, Zeynep, Ortel, Sibel, Zhang, Xinyi, Cunha, Margarida S., de Moura, Bruno Lustosa, Yu, Jie, Huber, Daniel, Ou, Jian-wen, Wittenmyer, Robert A., Gizon, Laurent and Chaplin, William J. |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 945 (1), pp. 1-12 |
Article Number | 20 |
Number of Pages | 12 |
Year | 2023 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/acb8ac |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/acb8ac |
Abstract | 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. |
Keywords | Asteroseismology (73); Exoplanets (498); Red giant stars (1372) |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Max Planck Institute for Astronomy, Germany |
Shanxi University, China | |
Chinese Academy of Sciences, China | |
University of Chicago, United States | |
Vanderbilt University, United States | |
University of Sydney | |
Aarhus University, Denmark | |
University of Warwick, United Kingdom | |
INAF - Catania Astrophysical Observatory, Italy | |
Florida Gulf Coast University, United States | |
University of New South Wales | |
University of La Laguna, Spain | |
Institute of Astrophysics of the Canary Islands, Spain | |
Paris-Saclay University, France | |
University of Warsaw, Poland | |
University of Porto, Portugal | |
University of California Riverside, United Sates | |
Yale University, United States | |
Ege University, Turkiye | |
Erciyes University, Turkiye | |
Macau University of Science and Technology, China | |
Federal University of Rio Grande do Norte, Brazil | |
University of Hawaii, United States | |
Shaoguan University, China | |
Centre for Astrophysics | |
Georg August University of Gottingen, Germany | |
NYUAD Institute, UAE | |
University of Birmingham, United Kingdom |
https://research.usq.edu.au/item/y3wqw/tess-asteroseismic-analysis-of-hd-76920-the-giant-star-hosting-an-extremely-eccentric-exoplanet
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