KELT-19Ab: A P ∼ 4.6-day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companion
Article
Article Title | KELT-19Ab: A P ∼ 4.6-day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companion |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Siverd, Robert J. (Author), Collins, Karen A. (Author), Zhou, George (Author), Quinn, Samuel N. (Author), Gaudi, B. Scott (Author), Stassun, Keivan G. (Author), Johnson, Marshall C. (Author), Bieryla, Allyson (Author), Latham, David W. (Author), Ciardi, David R. (Author), Rodriguez, Joseph E. (Author), Penev, Kaloyan (Author), Pinsonneault, Marc (Author), Pepper, Joshua (Author), Eastman, Jason D. (Author), Relles, Howard (Author), Kielkopf, John F. (Author), Gregorio, Joao (Author), Oberst, Thomas E. (Author), Aldi, Giulio Francesco (Author), Esquerdo, Gilbert A. (Author), Calkins, Michael L. (Author), Berlind, Perry (Author), Dressing, Courtney D. (Author), Patel, Rahul (Author), Stevens, Daniel J. (Author), Beatty, Thomas G. (Author), Lund, Michael B. (Author), Labadie-Bartz, Jonathan (Author), Kuhn, Rudolf B. (Author), Colon, Knicole D. (Author), James, David (Author), Yao, Xinyu (Author), Johnson, John A. (Author), Wright, Jason T. (Author), McCrady, Nate (Author), Wittenmyer, Robert A. (Author), Johnson, Samson A. (Author), Sliski, David H. (Author), Jensen, Eric L. N. (Author), Cohen, David H. (Author), McLeod, Kim K. (Author), Penny, Matthew T. (Author), Joner, Michael D. (Author), Stephens, Denise C. (Author), Villanueva, Steven, Jr. (Author), Zambelli, Roberto (Author), Stockdale, Christopher (Author), Evans, Phil (Author), Tan, Thiam-Guan (Author), Curtis, Ivan A. (Author), Reed, Phillip A. (Author), Trueblood, Mark (Author) and Trueblood, Patricia (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 155 (1), pp. 1-18 |
Article Number | 35 |
Number of Pages | 18 |
Year | 2017 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aa9e4d |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aa9e4d |
Abstract | We present the discovery of the giant planet KELT-19Ab, which transits the moderately bright (V ∼ 9.9) A8V star TYC 764-1494-1 with an orbital period of 4.61 days. We confirm the planetary nature of the companion via a combination of radial velocities, which limit the mass to ≳4.1 MJ (3s), and a clear Doppler tomography signal, which indicates a retrograde projected spin-orbit misalignment of λ = -179.7-3.8 +3.7 degrees. Global modeling indicates that the Teff = 7500 ±110 K host star has M M = 1.62+0.20 -0.25 and R = 1.83 0.10 R. The planet has a radius of RP = 1.91 0.11 RJ and receives a stellar insolation flux of ∼ 3.2 10 erg s-1 cm-2, leading to an inferred equilibrium temperature of Teq ∼ 1935 K assuming zero albedo and complete heat redistribution. With a v I sin 84.8 ±2.0 km s = -1, the host is relatively slowly rotating compared to other stars with similar effective temperatures, and it appears to be enhanced in metallic elements but deficient in calcium, suggesting that it is likely an Am star. KELT-19A would be the first detection of an Am host of a transiting planet of which we are aware. Adaptive optics observations of the system reveal the existence of a companion with late-G9V/early-K1V spectral type at a projected separation of »160 au. Radial velocity measurements indicate that this companion is bound. Most Am stars are known to have stellar companions, which are often invoked to explain the relatively slow rotation of the primary. In this case, the stellar companion is unlikely to have caused the tidal braking of the primary. However, it may have emplaced the transiting planetary companion via the Kozai-Lidov mechanism. |
Keywords | methods: observational; planets and satellites: detection; planets; and satellites: gaseous planets; techniques: photometric; techniques:; radial velocities; techniques: spectroscopic; 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 | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Las Cumbres Observatory, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Ohio State University, United States | |
Vanderbilt University, United States | |
National Aeronautics and Space Administration (NASA), United States | |
University of Texas at Dallas, United States | |
Lehigh University, United States | |
School of Mathematics, Physics and Computing | |
Atalaia Group and CROW Observatory, Portugal | |
Westminster College, United States | |
University of Salerno, Italy | |
California Institute of Technology (Caltech), United States | |
Infrared Processing and Analysis Center (IPAC), United States | |
Pennsylvania State University, United States | |
South African Astronomical Observatory, South Africa | |
NASA Goddard Space Flight Center, United States | |
University of Washington, United States | |
University of Montana, United States | |
Computational Engineering and Science Research Centre | |
University of Pennsylvania, United States | |
Swarthmore College, United States | |
Wellesley College, United States | |
Brigham Young University, United States | |
Lunae Astronomical Society, Italy | |
Hazelwood Observatory, Australia | |
El Sauce Observatory, Chile | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Ivan Curtis Private Observatory, Australia | |
Kutztown University, United States | |
Winer Observatory, United States |
https://research.usq.edu.au/item/q6x64/kelt-19ab-a-p-4-6-day-hot-jupiter-transiting-a-likely-am-star-with-a-distant-stellar-companion
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