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

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    Rodriguez_2019_AJ_158_197.pdf
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    Author
    Rodriguez, Joseph E.
    Eastman, Jason D.
    Zhou, George
    Quinn, Samuel N.
    Beatty, Thomas G.
    Penev, Kaloyan
    Johnson, Marshall C.
    Cargile, Phillip A.
    Latham, David W. cc
    Bieryla, Allyson
    Collins, Karen A.
    Dressing, Courtney D.
    Ciardi, David R.
    Relles, Howard M.
    Murawski, Gabriel
    Nishiumi, Taku
    Yonehara, Atsunori
    Ishimaru, Ryo
    Yoshida, Fumi
    Gregorio, Joao
    Lund, Michael B.
    Stevens, Daniel J.
    Stassun, Keivan G. cc
    Gaudi, B. Scott
    Colón, Knicole D.
    Pepper, Joshua
    Narita, Norio
    Awiphan, Supachai
    Chuanraksasat, Pongpichit
    Benni, Paul
    Zambelli, Roberto
    Garrison, Lehman H.
    Wilson, Maurice L.
    Cornachione, Matthew A.
    Wang, Sharon X.
    Labadie-Bartz, Jonathan
    Rodríguez, Romy
    Siverd, Robert J.
    Yao, Xinyu
    Bayliss, Daniel
    Berlind, Perry
    Calkins, Michael L.
    Christiansen, Jessie L. cc
    Cohen, David H.
    Conti, Dennis M.
    Curtis, Ivan A.
    DePoy, D. L.
    Esquerdo, Gilbert A.
    Evans, Phil
    Feliz, Dax
    Fulton, Benjamin J.
    Holoien, Thomas W.-S.
    James, David J.
    Jayasinghe, Tharindu
    Jang-Condell, Hannah cc
    Jensen, Eric L. N.
    Johnson, John A. cc
    Joner, Michael D.
    Khakpash, Somayeh
    Kielkopf, John F.
    Kuhn, Rudolf B.
    Manner, Mark
    Marshall, Jennifer L.
    McLeod, Kim K.
    McCrady, Nate
    Oberst, Thomas E.
    Oelkers, Ryan J.
    Penny, Matthew T.
    Reed, Phillip A.
    Sliski, David H.
    Shappee, B. J.
    Stephens, Denise C.
    Stockdale, Chris
    Tan, Thiam-Guan
    Trueblood, Mark
    Trueblood, Pat
    Villanueva, Steven
    Wittenmyer, Robert A.
    Wright, Jason T. cc
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    Affiliation
    Univ Arizona, Dept Astron & Steward Observ
    Issue Date
    2019-10-23
    
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    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Joseph E. Rodriguez et al 2019 AJ 158 197
    Journal
    ASTRONOMICAL JOURNAL
    Rights
    Copyright © 2019. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    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 T-eff = 6509(-49)(+50) K, a mass of M-* = 1.460(-0.059)(+0.055) M-circle dot, a radius of R-* = 1.506 +/- 0.022 R-circle dot, and an age of 0.78(-0.42)(+0.61) Gyr. Its planetary companion (KELT-24 b) has a radius of R-P = 1.272 +/- 0.021 R-J and a mass of M-P = 5.18(-0.22)(+0.21) M-J, and from Doppler tomographic observations, we find that the planet's orbit is well-aligned to its host star's projected spin axis (lambda = 2.6(-3.6)(+5.1)). 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.
    ISSN
    0004-6256
    DOI
    10.3847/1538-3881/ab4136
    Version
    Final published version
    Sponsors
    Harvard Future Faculty Leaders Postdoctoral fellowship; Space Telescope Science InstituteSpace Telescope Science Institute [HST-HF2-51402.001-A]; Vanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics; JSPS KAKENHIMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) [JP18H01265, JP18H05439]; JST PRESTO grant [JPMJPR1775]; FAPESPFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2017/23731-1]; NASANational Aeronautics & Space Administration (NASA) [80NSSC18K1009, NNX17AB94G, MT-13EPSCoR-0011, NAS 5-26555]; National Aeronautics and Space Administration (EPSCOR grant) [NNX13AM97A]; Australian Research Council (LIEF grant)Australian Research Council [LE140100050]; National Science FoundationNational Science Foundation (NSF) [1516242, 1608203]; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium; Gordon and Betty Moore FoundationGordon and Betty Moore Foundation [GBMF5490]; NSFNational Science Foundation (NSF) [AST-1515927]; Mt. Cuba Astronomical Foundation; Center for Cosmology and AstroParticle Physics (CCAPP) at OSU; Chinese Academy of Sciences South America Center for Astronomy (CASSACA); Villum Fonden (Denmark)
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-3881/ab4136
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