KELT-18b: Puffy Planet, Hot Host, Probably Perturbed
Article
Article Title | KELT-18b: Puffy Planet, Hot Host, Probably Perturbed |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | McLeod, Kim K. (Author), Rodriguez, Joseph E. (Author), Oelkers, Ryan J. (Author), Collins, Karen A. (Author), Bieryla, Allyson (Author), Fulton, Benjamin J. (Author), Stassun, Keivan G. (Author), Gaudi, B. Scott (Author), Penev, Kaloyan (Author), Stevens, Daniel J. (Author), Colon, Knicole D. (Author), Pepper, Joshua (Author), Narita, Norio (Author), Ryu, Tsuguru (Author), Fukui, Akihiko (Author), Reed, Phillip A. (Author), Tirrell, Bethany (Author), Visgaitis, Tiffany (Author), Kielkopf, John F. (Author), Cohen, David H. (Author), Jensen, Eric L. N. (Author), Gregorio, Joao (Author), Basturk, Ozgur (Author), Oberst, Thomas E. (Author), Melton, Casey (Author), Kempton, Eliza M.-R. (Author), Baldrige, Andrew (Author), Zhao, Y. Sunny (Author), Zambelli, Roberto (Author), Latham, David W. (Author), Esquerdo, Gilbert A. (Author), Berlind, Perry (Author), Calkins, Michael L. (Author), Howard, Andrew W. (Author), Isaacson, Howard (Author), Weiss, Lauren M. (Author), Benni, Paul (Author), Beatty, Thomas G. (Author), Eastman, Jason D. (Author), Penny, Matthew T. (Author), Siverd, Robert J. (Author), Lund, Michael B. (Author), Labadie-Bartz, Jonathan (Author), Zhou, G. (Author), Curtis, Ivan A. (Author), Joner, Michael D. (Author), Manner, Mark (Author), Relles, Howard (Author), Scarpetta, Gaetano (Author), Stephens, Denise C. (Author), Stockdale, Chris (Author), Tan, T. G. (Author), DePoy, D. L. (Author), Marshall, Jennifer L. (Author), Pogge, Richard W. (Author), Trueblood, Mark (Author) and Trueblood, Patricia (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 153 (6), pp. 1-15 |
Article Number | 263 |
Number of Pages | 15 |
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/aa6d5d |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aa6d5d |
Abstract | We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright (V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of, situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of, a radius of, and a density of, making it one of the most inflated planets known around a hot star. We argue that KELT-18b's high temperature and low surface gravity, which yield an estimated ∼600 km atmospheric scale height, combined with its hot, bright host, make it an excellent candidate for observations aimed at atmospheric characterization. We also present evidence for a bound stellar companion at a projected separation of ∼1100 au, and speculate that it may have contributed to the strong misalignment we suspect between KELT-18's spin axis and its planet's orbital axis. The inferior conjunction time is 2457542.524998 ± 0.000416 (BJDTDB) and the orbital period is 2.8717510 ± 0.0000029 days. We encourage Rossiter-McLaughlin measurements in the near future to confirm the suspected spin-orbit misalignment of this system. |
Keywords | methods: observational; planets and satellites: detection; planets; and satellites: gaseous planets; stars: individual (BD+60 1538); techniques: photometric; techniques: radial velocities; 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 | Wellesley College, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Vanderbilt University, United States | |
University of Hawaii, United States | |
Ohio State University, United States | |
Princeton University, United States | |
NASA Ames Research Center, United States | |
Lehigh University, United States | |
University of Tokyo, Japan | |
National Astronomical Observatory of Japan, Japan | |
Kutztown University, United States | |
School of Mathematics, Physics and Computing | |
Swarthmore College, United States | |
Atalaia Group and CROW Observatory, Portugal | |
Ankara University, Turkiye | |
Westminster College, United States | |
Grinnell College, United States | |
Lunae Astronomical Society, Italy | |
California Institute of Technology (Caltech), United States | |
University of California, United States | |
University of Montreal, Canada | |
Acton Sky Portal, United States | |
Pennsylvania State University, United States | |
Las Cumbres Observatory, United States | |
Ivan Curtis Private Observatory, Australia | |
Brigham Young University, United States | |
Spot Observatory, United States | |
University of Salerno, Italy | |
Hazelwood Observatory, Australia | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Texas A&M University, United States | |
Winer Observatory, United States |
https://research.usq.edu.au/item/q6x52/kelt-18b-puffy-planet-hot-host-probably-perturbed
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