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

Chen Jiang; Tao Wu; Adina D. Feinstein; Keivan G. Stassun; Timothy R. Bedding; Dimitri Veras; Enrico Corsaro; Derek L. Buzasi; Dennis Stello; Yaguang Li; Savita Mathur; Rafael A. García; Sylvain N. Breton; Mia S. Lundkvist; Przemysław J. Mikołajczyk; Charlotte Gehan; Tiago L. Campante; Diego Bossini; Stephen R. Kane; Jia Mian Joel Ong; Mutlu Yıldız; Cenk Kayhan; Zeynep Çelik Orhan; Sibel Örtel; Xinyi Zhang; Margarida S. Cunha; Bruno Lustosa de Moura; Jie Yu; Daniel Huber; Jian Wen Ou; Robert A. Wittenmyer; Laurent Gizon; William J. Chaplin

doi:10.3847/1538-4357/acb8ac

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

Chen Jiang, Tao Wu, Adina D. Feinstein, Keivan G. Stassun, Timothy R. Bedding, Dimitri Veras, Enrico Corsaro, Derek L. Buzasi, Dennis Stello, Yaguang Li, Savita Mathur, Rafael A. García, Sylvain N. Breton, Mia S. Lundkvist, Przemysław J. Mikołajczyk, Charlotte Gehan, Tiago L. Campante, Diego Bossini, Stephen R. Kane, Jia Mian Joel OngMutlu Yıldız, Cenk Kayhan, Zeynep Çelik Orhan, Sibel Örtel, Xinyi Zhang, Margarida S. Cunha, Bruno Lustosa de Moura, Jie Yu, Daniel Huber, Jian Wen Ou, Robert A. Wittenmyer, Laurent Gizon, William J. Chaplin

Center for Space Science

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	20
Journal	Astrophysical Journal
Volume	945
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/acb8ac
State	Published - Mar 1 2023

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Jiang, C., Wu, T., Feinstein, A. D., Stassun, K. G., Bedding, T. R., Veras, D., Corsaro, E., Buzasi, D. L., Stello, D., Li, Y., Mathur, S., García, R. A., Breton, S. N., Lundkvist, M. S., Mikołajczyk, P. J., Gehan, C., Campante, T. L., Bossini, D., Kane, S. R., ... Chaplin, W. J. (2023). TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet. Astrophysical Journal, 945(1), Article 20. https://doi.org/10.3847/1538-4357/acb8ac

Jiang, C, Wu, T, Feinstein, AD, Stassun, KG, Bedding, TR, Veras, D, Corsaro, E, Buzasi, DL, Stello, D, Li, Y, Mathur, S, García, RA, Breton, SN, Lundkvist, MS, Mikołajczyk, PJ, Gehan, C, Campante, TL, Bossini, D, Kane, SR, Joel Ong, JM, Yıldız, M, Kayhan, C, Çelik Orhan, Z, Örtel, S, Zhang, X, Cunha, MS, de Moura, BL, Yu, J, Huber, D, Ou, JW, Wittenmyer, RA, Gizon, L & Chaplin, WJ 2023, 'TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet', Astrophysical Journal, vol. 945, no. 1, 20. https://doi.org/10.3847/1538-4357/acb8ac

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title = "TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting an Extremely Eccentric Exoplanet",

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.",

author = "Chen Jiang and Tao Wu and Feinstein, {Adina D.} and Stassun, {Keivan G.} and Bedding, {Timothy R.} and Dimitri Veras and Enrico Corsaro and Buzasi, {Derek L.} and Dennis Stello and Yaguang Li and Savita Mathur and Garc{\'i}a, {Rafael A.} and Breton, {Sylvain N.} and Lundkvist, {Mia S.} and Miko{\l}ajczyk, {Przemys{\l}aw J.} and Charlotte Gehan and Campante, {Tiago L.} and Diego Bossini and Kane, {Stephen R.} and {Joel Ong}, {Jia Mian} and Mutlu Yıldız and Cenk Kayhan and {{\c C}elik Orhan}, Zeynep and Sibel {\"O}rtel and Xinyi Zhang and Cunha, {Margarida S.} and {de Moura}, {Bruno Lustosa} and Jie Yu and Daniel Huber and Ou, {Jian Wen} and Wittenmyer, {Robert A.} and Laurent Gizon and Chaplin, {William J.}",

note = "Publisher Copyright: {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society.",

year = "2023",

month = mar,

day = "1",

doi = "10.3847/1538-4357/acb8ac",

language = "English (US)",

volume = "945",

journal = "Astrophysical Journal",

issn = "0004-637X",

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number = "1",

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TY - JOUR

T1 - TESS Asteroseismic Analysis of HD 76920

T2 - The Giant Star Hosting an Extremely Eccentric Exoplanet

AU - Jiang, Chen

AU - Wu, Tao

AU - Feinstein, Adina D.

AU - Stassun, Keivan G.

AU - Bedding, Timothy R.

AU - Veras, Dimitri

AU - Corsaro, Enrico

AU - Buzasi, Derek L.

AU - Stello, Dennis

AU - Li, Yaguang

AU - Mathur, Savita

AU - García, Rafael A.

AU - Breton, Sylvain N.

AU - Lundkvist, Mia S.

AU - Mikołajczyk, Przemysław J.

AU - Gehan, Charlotte

AU - Campante, Tiago L.

AU - Bossini, Diego

AU - Kane, Stephen R.

AU - Joel Ong, Jia Mian

AU - Yıldız, Mutlu

AU - Kayhan, Cenk

AU - Çelik Orhan, Zeynep

AU - Örtel, Sibel

AU - Zhang, Xinyi

AU - Cunha, Margarida S.

AU - de Moura, Bruno Lustosa

AU - Yu, Jie

AU - Huber, Daniel

AU - Ou, Jian Wen

AU - Wittenmyer, Robert A.

AU - Gizon, Laurent

AU - Chaplin, William J.

PY - 2023/3/1

Y1 - 2023/3/1

N2 - 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.

AB - 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.

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VL - 945

JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

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

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