TESS Giants Transiting Giants. VII. A Hot Saturn Orbiting an Oscillating Red Giant Star
Article
Saunders, Nicholas, Grunblatt, Samuel K., Huber, Daniel, Ong, J. M. Joel, Schlaufman, Kevin C., Hey, Daniel, Li, Yaguang, Butler, R. P., Crane, Jeffrey D., Shectman, Steve, Teske, Johanna K., Quinn, Samuel N., Yee, Samuel W, Brahm, Rafael, Trifonov, Trifon, Jordan, Andrés, Henning, Thomas, Sing, David K., MacGregor, Meredith, ..., Jenkins, Jon M.. 2025. "TESS Giants Transiting Giants. VII. A Hot Saturn Orbiting an Oscillating Red Giant Star." The Astronomical Journal. 169 (2). https://doi.org/10.3847/1538-3881/ad9a87
Article Title | TESS Giants Transiting Giants. VII. A Hot Saturn Orbiting an Oscillating Red Giant Star |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Saunders, Nicholas, Grunblatt, Samuel K., Huber, Daniel, Ong, J. M. Joel, Schlaufman, Kevin C., Hey, Daniel, Li, Yaguang, Butler, R. P., Crane, Jeffrey D., Shectman, Steve, Teske, Johanna K., Quinn, Samuel N., Yee, Samuel W, Brahm, Rafael, Trifonov, Trifon, Jordan, Andrés, Henning, Thomas, Sing, David K., MacGregor, Meredith, Clark, Catherine A., Littlefield, Colin, Deveny, Sarah, Howell, Steve B., Page, Emma, Rapetti, David, Falk, Ben, Levine, Alan M., Huang, Chelsea X., Lund, Michael B., Ricker, George R., Seager, S., Winn, Joshua N. and Jenkins, Jon M. |
Journal Title | The Astronomical Journal |
Journal Citation | 169 (2) |
Article Number | 75 |
Number of Pages | 13 |
Year | 2025 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad9a87 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad9a87 |
Abstract | We present the discovery of TOI-7041 b (TIC 201175570 b), a hot Saturn transiting a red giant star with measurable stellar oscillations. We observe solar-like oscillations in TOI-7041 with a frequency of maximum power of ? max = 218.50 ± 2.23 ?Hz and a large frequency separation of ?? = 16.5282 ± 0.0186 ?Hz. Our asteroseismic analysis indicates that TOI-7041 has a mass of 1.07 ± 0.05(stat) ± 0.02(sys) M? and a radius of 4.10 ± 0.06(stat) ± 0.05(sys) R?, making it one of the largest stars around which a transiting planet has been discovered with the Transiting Exoplanet Survey Satellite (TESS), and the mission's first oscillating red giant with a transiting planet. TOI-7041 b has an orbital period of 9.691 ± 0.006 days and a low eccentricity of e = 0.04 ± 0.04. We measure a planet radius of 1.02 ± 0.03 RJup with TESS photometry, and a planet mass of 0.36 ± 0.16 MJup (114 ± 51 M?) with ground-based radial velocity measurements. TOI-7041 b appears less inflated than similar systems receiving equivalent incident flux, and its circular orbit indicates that it is not undergoing tidal heating due to circularization. The asteroseismic analysis of the host star provides some of the tightest constraints on the stellar properties of a TESS planet host and enables precise characterization of the hot Saturn. This system joins a small number of TESS-discovered exoplanets orbiting stars that exhibit clear stellar oscillations and indicates that extended TESS observations of evolved stars will similarly provide a path to improved exoplanet characterization. © 2025. The Author(s). Published by the American Astronomical Society. |
Keywords | Transit photometry; Exoplanets ; Hot Jupiters; Asteroseismology; Stellar evolution; Late stellar evolution; Red giant stars; Exoplanet detection methods |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of Hawaii, United States |
Johns Hopkins University, United States | |
University of Alabama, United States | |
University of Sydney | |
Carnegie Institution for Science, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Adolfo Ibanez University, Chile | |
Millennium Institute for Astrophysics, Chile | |
Data Observatory Foundation, Chile | |
Heidelberg University, Germany | |
Sofia University, Bulgaria | |
Max Planck Institute for Astronomy, Germany | |
NASA Exoplanet Science Institute, United States | |
Bay Area Environmental Research Institute, United States | |
NASA Ames Research Center, United States | |
Lehigh University, United States | |
Universities Space Research Association, United States | |
Space Telescope Science Institute, United States | |
Massachusetts Institute of Technology, United States | |
Centre for Astrophysics | |
Princeton University, United States |
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