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. Garcia; Sylvain N. Breton; Mia S. Lundkvist; Przemyslaw J. Mikolajczyk; Charlotte Gehan; Tiago L. Campante; Diego Bossini; Stephen R. Kane; Jia Mian Joel Ong; Mutlu Yildiz; Cenk Kayhan; Zeynep Celik Orhan; Sibel Ortel; 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. Garcia, Sylvain N. Breton, Mia S. Lundkvist, Przemyslaw J. Mikolajczyk, Charlotte Gehan, Tiago L. Campante, Diego Bossini, Stephen R. Kane, Jia Mian Joel OngMutlu Yildiz, Cenk Kayhan, Zeynep Celik Orhan, Sibel Ortel, Xinyi Zhang, Margarida S. Cunha, Bruno Lustosa de Moura, Jie Yu, Daniel Huber, Jian-wen Ou, Robert A. Wittenmyer, Laurent Gizon, William J. Chaplin

^*Corresponding author for this work

Physics and Astronomy

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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 Mpsini=3.57±0.22MJup . 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
Article number	20
Number of pages	12
Journal	The Astronomical Journal
Volume	945
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/acb8ac
Publication status	Published - 2 Mar 2023

Bibliographical note

18 pages, 7 figures, 4 tables

Keywords

astro-ph.SR
astro-ph.EP
Stars and Stellar Physics
340

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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., Garcia, R. A., Breton, S. N., Lundkvist, M. S., Mikolajczyk, 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. The Astronomical Journal, 945(1), Article 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 Mpsini=3.57±0.22MJup . 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 = "astro-ph.SR, astro-ph.EP, Stars and Stellar Physics, 340",

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 Garcia, {Rafael A.} and Breton, {Sylvain N.} and Lundkvist, {Mia S.} and Mikolajczyk, {Przemyslaw J.} and Charlotte Gehan and Campante, {Tiago L.} and Diego Bossini and Kane, {Stephen R.} and Ong, {Jia Mian Joel} and Mutlu Yildiz and Cenk Kayhan and Orhan, {Zeynep Celik} and Sibel Ortel and Xinyi Zhang and Cunha, {Margarida S.} and Moura, {Bruno Lustosa de} and Jie Yu and Daniel Huber and Jian-wen Ou and Wittenmyer, {Robert A.} and Laurent Gizon and Chaplin, {William J.}",

note = "18 pages, 7 figures, 4 tables",

year = "2023",

month = mar,

day = "2",

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

language = "English",

volume = "945",

journal = "The Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

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}

Jiang, C, Wu, T, Feinstein, AD, Stassun, KG, Bedding, TR, Veras, D, Corsaro, E, Buzasi, DL, Stello, D, Li, Y, Mathur, S, Garcia, RA, Breton, SN, Lundkvist, MS, Mikolajczyk, PJ, Gehan, C, Campante, TL, Bossini, D, Kane, SR, Ong, JMJ, Yildiz, M, Kayhan, C, Orhan, ZC, Ortel, S, Zhang, X, Cunha, MS, Moura, BLD, Yu, J, Huber, D, Ou, J, Wittenmyer, RA, Gizon, L & Chaplin, WJ 2023, 'TESS Asteroseismic Analysis of HD 76920: The Giant Star Hosting An Extremely Eccentric Exoplanet', The Astronomical Journal, vol. 945, no. 1, 20. https://doi.org/10.3847/1538-4357/acb8ac

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 - Garcia, Rafael A.

AU - Breton, Sylvain N.

AU - Lundkvist, Mia S.

AU - Mikolajczyk, Przemyslaw J.

AU - Gehan, Charlotte

AU - Campante, Tiago L.

AU - Bossini, Diego

AU - Kane, Stephen R.

AU - Ong, Jia Mian Joel

AU - Yildiz, Mutlu

AU - Kayhan, Cenk

AU - Orhan, Zeynep Celik

AU - Ortel, Sibel

AU - Zhang, Xinyi

AU - Cunha, Margarida S.

AU - Moura, Bruno Lustosa de

AU - Yu, Jie

AU - Huber, Daniel

AU - Ou, Jian-wen

AU - Wittenmyer, Robert A.

AU - Gizon, Laurent

AU - Chaplin, William J.

N1 - 18 pages, 7 figures, 4 tables

PY - 2023/3/2

Y1 - 2023/3/2

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 Mpsini=3.57±0.22MJup . 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 Mpsini=3.57±0.22MJup . 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.

KW - astro-ph.SR

KW - astro-ph.EP

KW - Stars and Stellar Physics

KW - 340

U2 - 10.3847/1538-4357/acb8ac

DO - 10.3847/1538-4357/acb8ac

M3 - Article

SN - 0004-6256

VL - 945

JO - The Astronomical Journal

JF - The Astronomical Journal

IS - 1

M1 - 20

ER -

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

Abstract

Bibliographical note

Keywords

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