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 Cargile; David 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

doi:10.3847/0004-6256/152/5/136

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arXiv · 1607.03512

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

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Abstract

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 -0.29/+0.28 Mj, 1.525 -0.060/+0.065 Rj hot-Jupiter in a 3.08 day period orbit misaligned at -115.9 +/- 4.1 deg 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 over 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 (alpha < 0.30 at 2 sigma significance). KELT-17 is only the fourth A-star with a confirmed transiting planet, and with a mass of 1.635 -0.061/+0.066 Msun, effective temperature of 7454 +/- 49 K, and projected rotational velocity v sin I_* = 44.2 -1.3/+1.5 km/s; it is amongst the most massive, hottest, and most rapidly rotating of known planet hosts.

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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 Cargile, David 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. 2016-07-12. KELT-17b: A hot-Jupiter transiting an A-star in a misaligned orbit detected with Doppler tomography. https://doi.org/10.3847/0004-6256/152/5/136

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