KELT-17B: A HOT-JUPITER TRANSITING AN A-STAR IN A MISALIGNED ORBIT DETECTED WITH DOPPLER TOMOGRAPHY

Journal Article · Tue Nov 01 00:00:00 EDT 2016 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/0004-6256/152/5/136· OSTI ID:22862849

Zhou, George; Latham, David W.; Bieryla, Allyson; Eastman, Jason; Cargile, Phillip ^[1]; Rodriguez, Joseph E.; Collins, Karen A.; Stassun, Keivan G.; Lund, Michael B. ^[2]; Beatty, Thomas ^[3]; Oberst, Thomas; Heintz, Tyler M. ^[4]; Kuhn, Rudolf B. ^[5]; Labadie-Bartz, Jonathan; Pepper, Joshua ^[6]; Siverd, Robert J. ^[7]; Stevens, Daniel J.; Gaudi, B. Scott ^[8]; Buchhave, Lars A. ^[9]; Colón, Knicole ^[10] ; others, and

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
2. Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235 (United States)
3. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States)
4. Department of Physics, Westminster College, New Wilmington, PA 16172 (United States)
5. South African Astronomical Observatory, P.O. Box 9, Observatory 7935 (South Africa)
6. Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015 (United States)
7. Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117 (United States)
8. Department of Astronomy, The Ohio State University, Columbus, OH 43210 (United States)
9. Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, DK-1350 Copenhagen (Denmark)
10. NASA Ames Research Center, M/S 244-30, Moffett Field, CA 94035 (United States)

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{sub −0.29}{sup +0.28} M{sub J}, 1.525{sub −0.060}{sup +0.065} R{sub J} 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{sub −0.061}{sup +0.066} M{sub ⊙}, an effective temperature of 7454 ± 49 K, and a projected rotational velocity of vsinI{sub ∗}=44.2{sub −1.3}{sup +1.5} km s{sup −1}; it is among the most massive, hottest, and most rapidly rotating of known planet hosts.

• OSTI ID: 22862849
• Journal Information: The Astronomical Journal (Online), Vol. 152, Issue 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DETECTION
ORBITS
PLANETS
RADIAL VELOCITY
SATELLITES
SPIN
STARS