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

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 v...

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Bibliographic Details
Published in:arXiv.org 2016-09
Main Authors: Zhou, George, Rodriguez, Joseph E, Collins, Karen A, Beatty, Thomas, Oberst, Thomas, Heintz, Tyler M, Stassun, Keivan G, Latham, David W, Kuhn, Rudolf B, Bieryla, Allyson, Lund, Michael B, Labadie-Bartz, Jonathan, Siverd, Robert J, Stevens, Daniel J, Gaudi, B Scott, Pepper, Joshua, Buchhave, Lars A, Eastman, Jason, Colón, Knicole, Cargile, Phillip, James, David, Gregorio, Joao, Reed, Phillip A, Jensen, Eric L N, Cohen, David H, McLeod, Kim K, Tan, T G, Zambelli, Roberto, Bayliss, Daniel, Bento, Joao, Esquerdo, Gilbert A, Berlind, Perry, Calkins, Michael L, Blancato, Kirsten, Manner, Mark, Samulski, Camile, Stockdale, Christopher, Nelson, Peter, Stephens, Denise, Curtis, Ivan, Kielkopf, John, Fulton, Benjamin J, DePoy, D L, Marshall, Jennifer L, Pogge, Richard, Gould, Andy, Trueblood, Mark, Trueblood, Pat
Format: Article
Language:English
Subjects:
Differential rotation
Extrasolar planets
Planetary rotation
Radial velocity
Rotating bodies
Solar rotation
Stellar rotation
Transit
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1607.03512