KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin
Article
Article Title | KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin |
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ERA Journal ID | 1058 |
Article Category | Article |
Authors | Labadie-Bartz, Jonathan (Author), Rodriguez, Joseph E. (Author), Stassun, Keivan G. (Author), Ciardi, David R. (Author), Penev, Kaloyan (Author), Johnson, Marshall C. (Author), Gaudi, B. Scott (Author), Colon, Knicole D. (Author), Bieryla, Allyson (Author), Latham, David W. (Author), Pepper, Joshua (Author), Collins, Karen A. (Author), Evans, Phil (Author), Relles, Howard (Author), Siverd, Robert J. (Author), Bento, Joao (Author), Yao, Xinyu (Author), Stockdale, Chris (Author), Tan, Thiam-Guan (Author), Zhou, George (Author), Eastman, Jason D. (Author), Albrow, Michael D. (Author), Bayliss, Daniel (Author), Beatty, Thomas G. (Author), Berlind, Perry (Author), Bozza, Valerio (Author), Calkins, Michael L. (Author), Cohen, David H. (Author), Curtis, Ivan A. (Author), Esquerdo, Gilbert A. (Author), Feliz, Dax (Author), Fulton, Benjamin J. (Author), Gregorio, Joao (Author), James, David (Author), Jensen, Eric L. N. (Author), Johnson, John A. (Author), Johnson, Samson A. (Author), Joner, Michael D. (Author), Kasper, David (Author), Kielkopf, John F. (Author), Kuhn, Rudolf B. (Author), Lund, Michael B. (Author), Malpas, Amber (Author), Manner, Mark (Author), McCrady, Nate (Author), McLeod, Kim K. (Author), Oberst, Thomas E. (Author), Penny, Matthew T. (Author), Reed, Phillip A. (Author), Sliski, David H. (Author), Stephens, Denise C. (Author), Stevens, Daniel J. (Author), Villanueva, Steven, Jr. (Author), Wittenmyer, Robert A. (Author), Wright, J. T. (Author) and Zambelli, Roberto (Author) |
Journal Title | Astrophysical Journal Supplement Series |
Journal Citation | 240 (1), pp. 1-17 |
Article Number | 13 |
Number of Pages | 17 |
Year | 2019 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0067-0049 |
1538-4365 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4365/aaee7e |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4365/aaee7e |
Abstract | We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright (V similar to 11.1) Sun-like G2V star TYC 7518-468-1. The planet has an orbital period of P = 1.3866529 +/- 0.0000027 days, a radius of R-P = 1.285(-0.071)(+0.12) R-J, and a relatively large mass of M-P = 3.47(-0.14)(+0.15), M-J. The star has R-star = 1.099(-0.046)(0.079) R-circle dot, M-star = 1.092(-0.041)(+0.045) M-circle dot, T-eff = 5767(-49)(+50) K, log g(star) = 4.393(-0.060)(+0.039) (cgs), and [m/H] = +0.259(-0.083)(+0.085); thus other than its slightly super-solar metallicity, it appears to be a near-solar twin. Surprisingly, KELT-22A exhibits kinematics and a Galactic orbit that are somewhat atypical for thin-disk stars. Nevertheless, the star is rotating rapidly for its estimated age, and shows evidence of chromospheric activity. Imaging reveals a slightly fainter companion to KELT-22A that is likely bound, with a projected separation of 6 '' (similar to 1400 au). In addition to the orbital motion caused by the transiting planet, we detect a possible linear trend in the radial velocity of KELT-22A, suggesting the presence of another relatively nearby body that is perhaps non-stellar. KELT-22Ab is highly irradiated (as a consequence of the small semimajor axis of a/R-star, and is mildly inflated. At such small separations, tidal forces become significant. The configuration of this system is optimal for measuring the rate of tidal dissipation within the host star. Our models predict that, due to tidal forces, the semimajor axis is decreasing rapidly, and KELT-22Ab is predicted to spiral into the star within the next Gyr. |
Keywords | methods: observational; planets and satellites: detection; planets; and satellites: gaseous planets; techniques: photometric; techniques:; radial velocities; techniques: spectroscopic; Astrophysics - Earth and; Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Delaware, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Vanderbilt University, United States | |
California Institute of Technology (Caltech), United States | |
University of Texas at Dallas, United States | |
Ohio State University, United States | |
NASA Goddard Space Flight Center, United States | |
Lehigh University, United States | |
El Sauce Observatory, Chile | |
Las Cumbres Observatory, United States | |
Australian National University | |
Hazelwood Observatory, Australia | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
University of Canterbury, New Zealand | |
Pennsylvania State University, United States | |
University of Salerno, Italy | |
Swarthmore College, United States | |
Ivan Curtis Private Observatory, Australia | |
Atalaia Group and CROW Observatory, Portugal | |
Brigham Young University, United States | |
University of Wyoming, United States | |
School of Mathematics, Physics and Computing | |
South African Astronomical Observatory, South Africa | |
Spot Observatory, United States | |
University of Montana, United States | |
Wellesley College, United States | |
Westminster College, United States | |
Kutztown University, United States | |
University of Pennsylvania, United States | |
Centre for Astrophysics | |
Lunae Astronomical Society, Italy |
https://research.usq.edu.au/item/q6x4w/kelt-22ab-a-massive-short-period-hot-jupiter-transiting-a-near-solar-twin
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