KELT-20b: A Giant Planet with a Period of P 3.5 days Transiting the V 7.6 Early A Star HD 185603 Academic Article uri icon

abstract

  • Abstract We report the discovery of KELT-20b, a hot Jupiter transiting a early A star, HD 185603, with an orbital period of days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating ( m{s}}}^{-1}$?> ) A2V star with an effective temperature of K, mass of , radius of , surface gravity of , and age of . The planetary companion has a radius of m{J}}}$?> , a semimajor axis of au, and a linear ephemeris of . We place a upper limit of m{J}}}$?> on the mass of the planet. Doppler tomographic measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star ( ). The inclination of the star is constrained to , implying a three-dimensional spinorbit alignment of

published proceedings

  • ASTRONOMICAL JOURNAL

altmetric score

  • 107.18

author list (cited authors)

  • Lund, M. B., Rodriguez, J. E., Zhou, G., Gaudi, B. S., Stassun, K. G., Johnson, M. C., ... Sliski, D. H.

citation count

  • 83

complete list of authors

  • Lund, Michael B||Rodriguez, Joseph E||Zhou, George||Gaudi, B Scott||Stassun, Keivan G||Johnson, Marshall C||Bieryla, Allyson||Oelkers, Ryan J||Stevens, Daniel J||Collins, Karen A||Penev, Kaloyan||Quinn, Samuel N||Latham, David W||Villanueva, Steven Jr||Eastman, Jason D||Kielkopf, John F||Oberst, Thomas E||Jensen, Eric LN||Cohen, David H||Joner, Michael D||Stephens, Denise C||Relles, Howard||Corfini, Giorgio||Gregorio, Joao||Zambelli, Roberto||Esquerdo, Gilbert A||Calkins, Michael L||Berlind, Perry||Ciardi, David R||Dressing, Courtney||Patel, Rahul||Gagnon, Patrick||Gonzales, Erica||Beatty, Thomas G||Siverd, Robert J||Labadie-Bartz, Jonathan||Kuhn, Rudolf B||Colon, Knicole D||James, David||Pepper, Joshua||Fulton, Benjamin J||McLeod, Kim K||Stockdale, Christopher||Novati, Sebastiano Calchi||Depoy, DL||Gould, Andrew||Marshall, Jennifer L||Trueblood, Mark||Trueblood, Patricia||Johnson, John A||Wright, Jason||McCrady, Nate||Wittenmyer, Robert A||Johnson, Samson A||Sergi, Anthony||Wilson, Maurice||Sliski, David H

publication date

  • November 2017