KELT-24b: A 5MJ Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148
Article
Article Title | KELT-24b: A 5MJ Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Rodriguez, Joseph E. (Author), Eastman, Jason D. (Author), Zhou, George (Author), Quinn, Samuel N. (Author), Beatty, Thomas G. (Author), Penev, Kaloyan (Author), Johnson, Marshall C. (Author), Cargile, Phillip A. (Author), Latham, David W. (Author), Bieryla, Allyson (Author), Collins, Karen A. (Author), Dressing, Courtney D. (Author), Ciardi, David R. (Author), Relles, Howard M. (Author), Murawski, Gabriel (Author), Nishiumi, Taku (Author), Yonehara, Atsunori (Author), Ishimaru, Ryo (Author), Yoshida, Fumi (Author), Gregorio, Joao (Author), Lund, Michael B. (Author), Stevens, Daniel J. (Author), Stassun, Keivan G. (Author), Gaudi, B. Scott (Author), Colon, Knicole D. (Author), Pepper, Joshua (Author), Narita, Norio (Author), Awiphan, Supachai (Author), Chuanraksasat, Pongpichit (Author), Benni, Paul (Author), Zambelli, Roberto (Author), Garrison, Lehman H. (Author), Wilson, Maurice L. (Author), Cornachione, Matthew A. (Author), Wang, Sharon X. (Author), Labadie-Bartz, Jonathan (Author), Rodriguez, Romy (Author), Siverd, Robert J. (Author), Yao, Xinyu (Author), Bayliss, Daniel (Author), Berlind, Perry (Author), Calkins, Michael L. (Author), Christiansen, Jessie L. (Author), Cohen, David H. (Author), Conti, Dennis M. (Author), Curtis, Ivan A. (Author), DePoy, D. L. (Author), Esquerdo, Gilbert A. (Author), Evans, Phil (Author), Feliz, Dax (Author), Fulton, Benjamin J. (Author), Holoien, Thomas W. -S. (Author), James, David J. (Author), Jayasinghe, Tharindu (Author), Jang-Condell, Hannah (Author), Jensen, Eric L. N. (Author), Johnson, John A. (Author), Joner, Michael D. (Author), Khakpash, Somayeh (Author), Kielkopf, John F. (Author), Kuhn, Rudolf B. (Author), Manner, Mark (Author), Marshall, Jennifer L. (Author), McLeod, Kim K. (Author), McCrady, Nate (Author), Oberst, Thomas E. (Author), Oelkers, Ryan J. (Author), Penny, Matthew T. (Author), Reed, Phillip A. (Author), Sliski, David H. (Author), Shappee, B. J. (Author), Stephens, Denise C. (Author), Stockdale, Chris (Author), Tan, Thiam-Guan (Author), Trueblood, Mark (Author), Trueblood, Pat (Author), Villanueva, Steven, Jr. (Author), Wittenmyer, Robert A. (Author) and Wright, Jason T. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 158 (5), pp. 1-15 |
Article Number | 197 |
Number of Pages | 15 |
Year | 2019 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ab4136 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ab4136 |
Abstract | We present the discovery of KELT-24 b, a massive hot Jupiter orbiting a bright (V = 8.3 mag, K = 7.2 mag) young F-star with a period of 5.6 days. The host star, KELT-24 (HD 93148), has a Teff = 6509-+4950 K, a mass of M* = 1.460-+0.0590.055 Me, a radius of R* = 1.506 ± 0.022 Re, and an age of 0.78-+0.420.61 Gyr. Its planetary companion (KELT-24 b) has a radius of RP = 1.272 ± 0.021 RJ and a mass of MP = 5.18-+0.220.21 MJ, and from Doppler tomographic observations, we find that the planet’s orbit is well-aligned to its host star’s projected spin axis (l = 2.6-+3.65.1). The young age estimated for KELT-24 suggests that it only recently started to evolve from the zero-age main sequence. KELT-24 is the brightest star known to host a transiting giant planet with a period between 5 and 10 days. Although the circularization timescale is much longer than the age of the system, we do not detect a large eccentricity or significant misalignment that is expected from dynamical migration. The brightness of its host star and its moderate surface gravity make KELT-24b an intriguing target for detailed atmospheric characterization through spectroscopic emission measurements since it would bridge the current literature results that have primarily focused on lower mass hot Jupiters and a few brown dwarfs. |
Keywords | Transit photometry; Exoplanet astronomy; Exoplanet detection methods; Radial velocity; 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 | Center for Astrophysics Harvard and Smithsonian, United States |
University of Arizona, United States | |
University of Texas at Dallas, United States | |
Ohio State University, United States | |
University of California, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Gabriel Murawski Private Observatory, Poland | |
Kyoto Sangyo University, Japan | |
Chiba Institute of Technology, Japan | |
Atalaia Group and CROW Observatory, Portugal | |
Pennsylvania State University, United States | |
Vanderbilt University, United States | |
NASA Goddard Space Flight Center, United States | |
Lehigh University, United States | |
National Astronomical Observatory of Japan, Japan | |
National Astronomical Research Institute of Thailand, Thailand | |
Acton Sky Portal, United States | |
Lunae Astronomical Society, Italy | |
University of Utah, United States | |
Carnegie Institution of Washington, United States | |
University of Sao Paulo, Brazil | |
University of Warwick, United Kingdom | |
Swarthmore College, United States | |
American Association of Variable Star Observers, United States | |
Ivan Curtis Private Observatory, Australia | |
Texas A&M University, United States | |
El Sauce Observatory, Chile | |
University of Wyoming, United States | |
Brigham Young University, United States | |
School of Mathematics, Physics and Computing | |
South African Astronomical Observatory, South Africa | |
Spot Observatory, United States | |
Wellesley College, United States | |
University of Montana, United States | |
Westminster College, United States | |
Kutztown University, United States | |
University of Pennsylvania, United States | |
University of Hawaii, United States | |
Hazelwood Observatory, Australia | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Winer Observatory, United States | |
Massachusetts Institute of Technology, United States | |
Centre for Astrophysics |
https://research.usq.edu.au/item/q6x5y/kelt-24b-a-5mj-planet-on-a-5-6-day-well-aligned-orbit-around-the-young-v-8-3-f-star-hd-93148
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