TOI-1518b: A Misaligned Ultra-hot Jupiter with Iron in Its Atmosphere
Article
Article Title | TOI-1518b: A Misaligned Ultra-hot Jupiter with Iron in Its Atmosphere |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Cabot, Samuel H. C. (Author), Bello-Arufe, Aaron (Author), Mendonca, Joao M. (Author), Tronsgaard, Rene (Author), Wong, Ian (Author), Zhou, George (Author), Buchhave, Lars A. (Author), Fischer, Debra A. (Author), Stassun, Keivan G. (Author), Antoci, Victoria (Author), Baker, David (Author), Belinski, Alexander A. (Author), Benneke, Bjorn (Author), Bouma, Luke G. (Author), Christiansen, Jessie L. (Author), Collins, Karen A. (Author), Goliguzova, Maria V. (Author), Hagey, Simone (Author), Jenkins, Jon M. (Author), Jensen, Eric L. N. (Author), Kidwell, Richard C., Jr. (Author), Laloum, Didier (Author), Massey, Bob (Author), McLeod, Kim K. (Author), Latham, David W. (Author), Morgan, Edward H. (Author), Ricker, George (Author), Safonov, Boris S. (Author), Schlieder, Joshua E. (Author), Seager, Sara (Author), Shporer, Avi (Author), Smith, Jeffrey C. (Author), Srdoc, Gregor (Author), Strakhov, Ivan A. (Author), Torres, Guillermo (Author), Twicken, Joseph D. (Author), Vanderspek, Roland (Author), Vezie, Michael (Author) and Winn, Joshua N. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 162 (5), pp. 1-19 |
Article Number | 218 |
Number of Pages | 19 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac1ba3 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac1ba3 |
Abstract | We present the discovery of TOI-1518b-an ultra-hot Jupiter orbiting a bright star (V=8.95). The transiting planet is confirmed using high-resolution optical transmission spectra from EXPRES. It is inflated, with Rp=1.875±0.053 RJ, and exhibits several interesting properties, including a misaligned orbit ( - 240.34+0.98 0.93 degrees) and nearly grazing transit ( = - b 0.9036+0.0053 0.0061). The planet orbits a fast-rotating F0 host star (Teff;7300 K) in 1.9 days and experiences intense irradiation. Notably, the TESS data show a clear secondary eclipse with a depth of 364±28 ppm and a significant phase-curve signal, from which we obtain a relative day-night planetary flux difference of roughly 320 ppm and a 5.2s detection of ellipsoidal distortion on the host star. Prompted by recent detections of atomic and ionized species in ultrahot Jupiter atmospheres, we conduct an atmospheric cross-correlation analysis. We detect neutral iron (5.2s), at = - K 157+ p 44 68 km s-1 and = - - V 16+ sys 4 2, adding another object to the small sample of highly irradiated gas-giant planets with Fe detections in transmission. Detections so far favor particularly inflated gas giants with radii 1.78 RJ, which may be due to observational bias. With an equilibrium temperature of Teq=2492±38 K and a measured dayside brightness temperature of 3237±59 K (assuming zero geometric albedo), TOI-1518b is a promising candidate for future emission spectroscopy to probe for a thermal inversion. |
Keywords | Exoplanet atmospheres; Transit photometry; High resolution spectroscopy; Astrophysics - Earth and Planetary; Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Yale University, United States |
Technical University of Denmark, Denmark | |
University of Denmark, Denmark | |
Massachusetts Institute of Technology, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Vanderbilt University, United States | |
Austin College, United States | |
Moscow State University, Russia | |
University of Montreal, Canada | |
Princeton University, United States | |
National Aeronautics and Space Administration (NASA), United States | |
University of Saskatchewan, Canada | |
Swarthmore College, United States | |
Space Telescope Science Institute, United States | |
French Astronomical Society, France | |
Villa ‘39 Observatory, United States | |
Wellesley College, United States | |
NASA Ames Research Center, United States | |
Kotizarovci Observatory, Croatia | |
Funding source | Australian Research Council (ARC) Grant ID DE210101893 |
https://research.usq.edu.au/item/q6x31/toi-1518b-a-misaligned-ultra-hot-jupiter-with-iron-in-its-atmosphere
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