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TESS Asteroseismic analysis of HD 76920 : the Giant Star hosting an extremely eccentric exoplanet
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(2023) TESS Asteroseismic analysis of HD 76920 : the Giant Star hosting an extremely eccentric exoplanet. The Astrophysical Journal, 945 (1). p. 20. doi:10.3847/1538-4357/acb8ac ISSN 0004-637X.
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Official URL: http://doi.org/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 ${M}_{{\rm{p}}}\sin i=3.57\pm 0.22\,{M}_{\mathrm{Jup}}$. 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.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||
ISSN: | 0004-637X | ||||||
Official Date: | 2 March 2023 | ||||||
Dates: |
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Volume: | 945 | ||||||
Number: | 1 | ||||||
Page Range: | p. 20 | ||||||
DOI: | 10.3847/1538-4357/acb8ac | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 9 March 2023 | ||||||
Date of first compliant Open Access: | 9 March 2023 |
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