KELT-4Ab: AN INFLATED HOT JUPITER TRANSITING THE BRIGHT (V similar to 10) COMPONENT OF A HIERARCHICAL TRIPLE
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2016. The American Astronomical Society. All rights reserved. We report the discovery of KELT-4Ab, an inflated, transiting Hot Jupiter orbiting the brightest component of ahierarchical triple stellar system. The host star is an F star with Teff =6206 75 K, log g =4.108 0.014, [Fe/H]= -0.116+0.069+0.065, M = 1.201-0.061+0.067 M, and R = 1.603-0.038+0.039 R. The best-fit linear ephemeris is BJDTDB =2456193.291570.00021 + E(2.98959360.0000048). With a magnitude of V10, a planetary radius of 1.699-0.045+0.046 RJ, and a mass of 0.902-0.059+0.060 MJ, it is the brightest host among the population of inflated Hot Jupiters (RP > 1.5RJ), making it a valuable discovery for probing the nature of inflated planets. In addition, its existence within a hierarchical triple and its proximity to Earth (210 pc) provide a unique opportunity for dynamical studies with continued monitoring with high resolution imaging and precision radial velocities. The projected separation between KELT-4A and KELT-4BC is 32816 AU and the projected separation between KELT-4B and KELT-4C is 10.300.74 AU. Assuming face-on, circular orbits, their respective periods would be 3780290 and 29.43.6 years and the astrometric motions relative to the epoch in this work of both the binary stars around each other and of the binary around the primary star would be detectable now and may provide meaningful constraints on the dynamics of the system.
author list (cited authors)
Eastman, J. D., Beatty, T. G., Siverd, R. J., Antognino, J., Penny, M. T., Gonzales, E. J., ... Trueblood, P.
complete list of authors
Eastman, Jason D||Beatty, Thomas G||Siverd, Robert J||Antognini, Joseph MO||Penny, Matthew T||Gonzales, Erica J||Crepp, Justin R||Howard, Andrew W||Avril, Ryan L||Bieryla, Allyson||Collins, Karen||Fulton, Benjamin J||Ge, Jian||Gregorio, Joao||Ma, Bo||Mellon, Samuel N||Oberst, Thomas E||Wang, Ji||Gaudi, B Scott||Pepper, Joshua||Stassun, Keivan G||Buchhave, Lars A||Jensen, Eric LN||Latham, David W||Berlind, Perry||Calkins, Michael L||Cargile, Phillip A||Colón, Knicole D||Dhital, Saurav||Esquerdo, Gilbert A||Johnson, John Asher||Kielkopf, John F||Manner, Mark||Mao, Qingqing||McLeod, Kim K||Penev, Kaloyan||Stefanik, Robert P||Street, Rachel||Zambelli, Roberto||DePoy, DL||Gould, Andrew||Marshall, Jennifer L||Pogge, Richard W||Trueblood, Mark||Trueblood, Patricia