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KELT-17b: A Hot-Jupiter Transiting an A-Star in a Misaligned Orbit Detected with Doppler Tomography

Zhou, George and Fulton, Benjamin J. (2016) KELT-17b: A Hot-Jupiter Transiting an A-Star in a Misaligned Orbit Detected with Doppler Tomography. Astronomical Journal, 152 (5). Art. No. 136. ISSN 0004-6256.

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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) M_J, 1.525^(+0.065)_(-0.060) R_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^(+0.066)_(-0.061) M⊙, an effective temperature of 7454 ± 49 K, and a projected rotational velocity of ν sin I* = 44.2^(+1.5)_(-1.3) km s^(-1) it is among the most massive, hottest, and most rapidly rotating of known planet hosts.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Zhou, George0000-0002-4891-3517
Fulton, Benjamin J.0000-0003-3504-5316
Additional Information:© 2016 The American Astronomical Society. Received 2016 July 12; revised 2016 August 24; accepted 2016 August 24; published 2016 October 25. The authors thank the referee for insightful comments. K.K.M. acknowledges the Theodore Dunham, Jr. Grant of the Fund for Astronomical Research for the purchase of the SDSS filters used at Whitin Observatory. B.J.F. notes that this material is based upon work supported by the National Science Foundation Graduate Research Fellowship under grant No. 2014184874. Work by B.S.G. and D.J.S. was partially supported by NSF CAREER Grant AST-1056524. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the authors(s) and do not necessarily reflect the views of the National Science Foundation.
Funding AgencyGrant Number
Fund for Astronomical ResearchUNSPECIFIED
NSF Graduate Research Fellowship2014184874
Subject Keywords:planets and satellites: individual (KELT-17b) – stars: individual (KELT-17, BD+14 1881, TYC 807-903-1)
Issue or Number:5
Record Number:CaltechAUTHORS:20180816-141055624
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Official Citation:George Zhou et al 2016 AJ 152 136
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88870
Deposited By: Tony Diaz
Deposited On:16 Aug 2018 21:47
Last Modified:03 Oct 2019 20:11

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