KELT-24b: A 5MJ Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148

Rodriguez, Joseph E. and Eastman, Jason D. and Zhou, George ORCID: and Quinn, Samuel N. and Beatty, Thomas G. and Penev, Kaloyan and Johnson, Marshall C. and Cargile, Phillip A. and Latham, David W. and Bieryla, Allyson and Collins, Karen A. and Dressing, Courtney D. and Ciardi, David R. and Relles, Howard M. and Murawski, Gabriel and Nishiumi, Taku and Yonehara, Atsunori and Ishimaru, Ryo and Yoshida, Fumi and Gregorio, Joao and Lund, Michael B. and Stevens, Daniel J. and Stassun, Keivan G. and Gaudi, B. Scott and Colon, Knicole D. and Pepper, Joshua and Narita, Norio and Awiphan, Supachai and Chuanraksasat, Pongpichit and Benni, Paul and Zambelli, Roberto and Garrison, Lehman H. and Wilson, Maurice L. and Cornachione, Matthew A. and Wang, Sharon X. and Labadie-Bartz, Jonathan and Rodriguez, Romy and Siverd, Robert J. and Yao, Xinyu and Bayliss, Daniel and Berlind, Perry and Calkins, Michael L. and Christiansen, Jessie L. and Cohen, David H. and Conti, Dennis M. and Curtis, Ivan A. and DePoy, D. L. and Esquerdo, Gilbert A. and Evans, Phil and Feliz, Dax and Fulton, Benjamin J. and Holoien, Thomas W. -S. and James, David J. and Jayasinghe, Tharindu and Jang-Condell, Hannah and Jensen, Eric L. N. and Johnson, John A. and Joner, Michael D. and Khakpash, Somayeh and Kielkopf, John F. and Kuhn, Rudolf B. and Manner, Mark and Marshall, Jennifer L. and McLeod, Kim K. and McCrady, Nate and Oberst, Thomas E. and Oelkers, Ryan J. and Penny, Matthew T. and Reed, Phillip A. and Sliski, David H. and Shappee, B. J. and Stephens, Denise C. and Stockdale, Chris and Tan, Thiam-Guan and Trueblood, Mark and Trueblood, Pat and Villanueva, Steven, Jr. and Wittenmyer, Robert A. and Wright, Jason T. (2019) KELT-24b: A 5MJ Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148. The Astronomical Journal, 158 (5):197. pp. 1-15. ISSN 0004-6256

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 09 Feb 2022 04:59
Last Modified: 14 Feb 2022 01:05
Uncontrolled Keywords: Transit photometry; Exoplanet astronomy; Exoplanet detection methods; Radial velocity; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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