KELT-17B: a hot-Jupiter transiting an A-star in a misaligned orbit detected with doppler tomography

George Zhou, Joseph E. Rodriguez, Karen A. Collins, Thomas Beatty, Thomas Oberst, Tyler M. Heintz, Keivan G. Stassun, David W. Latham, Rudolf B. Kuhn, Allyson Bieryla, Michael B. Lund, Jonathan Labadie-Bartz, Robert J. Siverd, Daniel J. Stevens, B. Scott Gaudi, Joshua Pepper, Lars A. Buchhave, Jason Eastman, Knicole Colón, Phillip CargileDavid James, Joao Gregorio, Phillip A. Reed, Eric L. N. Jensen, David H. Cohen, Kim K. McLeod, T. G. Tan, Roberto Zambelli, Daniel Bayliss, Joao Bento, Gilbert A. Esquerdo, Perry Berlind, Michael L. Calkins, Kirsten Blancato, Mark Manner, Camile Samulski, Christopher Stockdale, Peter Nelson, Denise Stephens, Ivan Curtis, John Kielkopf, Benjamin J. Fulton, D. L. Depoy, Jennifer L. Marshall, Richard Pogge, Andy Gould, Mark Trueblood, Pat Trueblood

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


We present the discovery of a hot Jupiter transiting the V = 9.23 mag main-sequence A-star KELT-17 (BD+14 1881). KELT-17b is a 1.31+0.28-0.29 MJ, 1.525+0.065-0.060 RJ hot-Jupiter in a 3.08-day period orbit misaligned at -115.°9 ± 4.°1 to the rotation axis of the star. The planet is confirmed via both the detection of the radial velocity orbit, and the Doppler tomographic detection of the shadow of the planet during two transits. The nature of the spin-orbit misaligned transit geometry allows us to place a constraint on the level of differential rotation in the host star; we find that KELT-17 is consistent with both rigid-body rotation and solar differential rotation rates (α<0.30 at 2σ significance). KELT-17 is only the fourth A-star with a confirmed transiting planet, and with a mass of 1.635+0.066-0.061 MΘ, an effective temperature of 7454 ± 49 K, and a projected rotational velocity of v sinI= 44.2+1.5-1.3 kms-1 it is among the most massive, hottest, and most rapidly rotating of known planet hosts.

Original languageEnglish
Article number136
Pages (from-to)1-15
Number of pages15
JournalAstronomical Journal
Issue number5
Publication statusPublished - 1 Nov 2016
Externally publishedYes


  • Planets and satellites: individual (KELT-17b)
  • stars: individual (KELT-17, BD+14 1881, TYC 807-903-1)


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