arXiv · 1906.03276
KELT-24b: A 5M$_{\rm J}$ Planet on a 5.6 day Well-Aligned Orbit around the Young V=8.3 F-star HD 93148
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 $T_{\rm eff}$ =$6509^{+50}_{-49}$ K, a mass of $M_{*}$ = $1.460^{+0.055}_{-0.059}$ $M_{\odot}$, radius of $R_{*}$ = $1.506\pm0.022$ $R_{\odot}$, and an age of $0.78^{+0.61}_{-0.42}$ Gyr. Its planetary companion (KELT-24 b) has a radius of $R_{\rm P}$ = $1.272\pm0.021$ $R_{\rm J}$, a mass of $M_{\rm P}$ = $5.18^{+0.21}_{-0.22}$ $M_{\rm J}$, and from Doppler tomographic observations, we find that the planet's orbit is well-aligned to its host star's projected spin axis ($\lambda$ = $2.6^{+5.1}_{-3.6}$). 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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Joseph E. Rodriguez, Jason D. Eastman, George Zhou, Samuel N. Quinn, Thomas G. Beatty, Kaloyan Penev, Marshall C. Johnson, Phillip A. Cargile, David W. Latham, Allyson Bieryla, Karen A. Collins, Courtney D. Dressing, David R. Ciardi, Howard M. Relles, Gabriel Murawski, Taku Nishiumi, Atsunori Yonehara, Ryo Ishimaru, Fumi Yoshida, Joao Gregorio, Michael B. Lund, Daniel J. Stevens, Keivan G. Stassun, B. Scott Gaudi, Knicole D. Colón, Joshua Pepper, Norio Narita, Supachai Awiphan, Pongpichit Chuanraksasat, Paul Benni, Roberto Zambelli, Lehman H. Garrison, Maurice L. Wilson, Matthew A. Cornachione, Sharon X. Wang, Jonathan Labadie-Bartz, Romy Rodríguez, Robert J. Siverd, Xinyu Yao, Daniel Bayliss, Perry Berlind, Michael L. Calkins, Jessie L. Christiansen, David H. Cohen, Dennis M. Conti, Ivan A. Curtis, D. L. Depoy, Gilbert A. Esquerdo, Phil Evans, Dax Feliz, Benjamin J. Fulton, Thomas W. S. Holoien, David J. James, Tharindu Jayasinghe, Hannah Jang-Condell, Eric L. N. Jensen, John A. Johnson, Michael D. Joner, Somayeh Khakpash, John F. Kielkopf, Rudolf B. Kuhn, Mark Manner, Jennifer L. Marshall, Kim K. McLeod, Nate McCrady, Thomas E. Oberst, Ryan J. Oelkers, Matthew T. Penny, Phillip A. Reed, David H. Sliski, B. J. Shappee, Denise C. Stephens, Chris Stockdale, Thiam-Guan Tan, Mark Trueblood, Pat Trueblood, Steven Villanueva Jr., Robert A. Wittenmyer, Jason T. Wright. 2019-06-07. KELT-24b: A 5M$_{\rm J}$ Planet on a 5.6 day Well-Aligned Orbit around the Young V=8.3 F-star HD 93148. https://doi.org/10.3847/1538-3881/ab4136
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