TESS Giants Transiting Giants. I.: A Noninflated Hot Jupiter Orbiting a Massive Subgiant
Article
Article Title | TESS Giants Transiting Giants. I.: A Noninflated Hot Jupiter Orbiting a Massive Subgiant |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Saunders, Nicholas (Author), Grunblatt, Samuel K. (Author), Huber, Daniel (Author), Collins, Karen A. (Author), Jensen, Eric L. N. (Author), Vanderburg, Andrew (Author), Brahm, Rafael (Author), Jordan, Andres (Author), Espinoza, Nestor (Author), Henning, Thomas (Author), Hobson, Melissa J. (Author), Quinn, Samuel N. (Author), Zhou, George (Author), Butler, R. Paul (Author), Crause, Lisa (Author), Kuhn, Rudi B. (Author), Moses Mogotsi, K. (Author), Hellier, Coel (Author), Angus, Ruth (Author), Hattori, Soichiro (Author), Chontos, Ashley (Author), Ricker, George R. (Author), Jenkins, Jon M. (Author), Tenenbaum, Peter (Author), Latham, David W. (Author), Seager, Sara (Author), Vanderspek, Roland K. (Author), Winn, Joshua N. (Author), Stockdale, Chris (Author) and Cloutier, Ryan (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 163 (2), pp. 1-15 |
Article Number | 53 |
Number of Pages | 15 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac38a1 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac38a1 |
Abstract | While the population of confirmed exoplanets continues to grow, the sample of confirmed transiting planets around evolved stars is still limited. We present the discovery and confirmation of a hot Jupiter orbiting TOI-2184 (TIC 176956893), a massive evolved subgiant (M ∗ = 1.53 ± 0.12 M o˙, R ∗ = 2.90 ± 0.14 R o˙) in the Transiting Exoplanet Survey Satellite (TESS) Southern Continuous Viewing Zone. The planet was flagged as a false positive by the TESS Quick-Look Pipeline due to periodic systematics introducing a spurious depth difference between even and odd transits. Using a new pipeline to remove background scattered light in TESS Full Frame Image data, we combine space-based TESS photometry, ground-based photometry, and ground-based radial velocity measurements to report a planet radius of R p = 1.017 ± 0.051 R J and mass of M p = 0.65 ± 0.16 M J . For a planet so close to its star, the mass and radius of TOI-2184b are unusually well matched to those of Jupiter. We find that the radius of TOI-2184b is smaller than theoretically predicted based on its mass and incident flux, providing a valuable new constraint on the timescale of post-main-sequence planet inflation. The discovery of TOI-2184b demonstrates the feasibility of detecting planets around faint (TESS magnitude > 12) post-main-sequence stars and suggests that many more similar systems are waiting to be detected in the TESS FFIs, whose confirmation may elucidate the final stages of planetary system evolution. |
Keywords | Exoplanet astronomy (486); Exoplanet evolution (491); Exoplanets (498); Stellar evolution (1599); Late stellar evolution (911); Red giant stars (1372); Red giant branch (1368); Subgiant stars (1646); Space telescopes (1547); Transit photometry (1709); Exoplanet detection methods (489); Transits (1711); Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Hawaii, United States |
American Museum of Natural History, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Swarthmore College, United States | |
Adolfo Ibanez University, Chile | |
Space Telescope Science Institute, United States | |
Max Planck Society, Germany | |
Millennium Institute of Astrophysics, Chile | |
Centre for Astrophysics | |
Carnegie Institution of Washington, United States | |
South African Astronomical Observatory, South Africa | |
Keele University, United Kingdom | |
Massachusetts Institute of Technology, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Princeton University, United States | |
Hazelwood Observatory, Australia | |
Funding source | Australian Research Council (ARC) Grant ID DE210101893 |
https://research.usq.edu.au/item/q7533/tess-giants-transiting-giants-i-a-noninflated-hot-jupiter-orbiting-a-massive-subgiant
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