KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early A Star HD 185603
Article
Article Title | KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early A Star HD 185603 |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Lund, Michael B. (Author), Rodriguez, Joseph E. (Author), Zhou, George (Author), Gaudi, B. Scott (Author), Stassun, Keivan G. (Author), Johnson, Marshall C. (Author), Bieryla, Allyson (Author), Oelkers, Ryan J. (Author), Stevens, Daniel J. (Author), Collins, Karen A. (Author), Penev, Kaloyan (Author), Quinn, Samuel N. (Author), Latham, David W. (Author), Villanueva, Steven, Jr. (Author), Eastman, Jason D. (Author), Kielkopf, John F. (Author), Oberst, Thomas E. (Author), Jensen, Eric L. N. (Author), Cohen, David H. (Author), Joner, Michael D. (Author), Stephens, Denise C. (Author), Relles, Howard (Author), Corfini, Giorgio (Author), Gregorio, Joao (Author), Zambelli, Roberto (Author), Esquerdo, Gilbert A. (Author), Calkins, Michael L. (Author), Berlind, Perry (Author), Ciardi, David R. (Author), Dressing, Courtney (Author), Patel, Rahul (Author), Gagnon, Patrick (Author), Gonzales, Erica (Author), Beatty, Thomas G. (Author), Siverd, Robert J. (Author), Labadie-Bartz, Jonathan (Author), Kuhn, Rudolf B. (Author), Colon, Knicole D. (Author), James, David (Author), Pepper, Joshua (Author), Fulton, Benjamin J. (Author), McLeod, Kim K. (Author), Stockdale, Christopher (Author), Calchi Novati, Sebastiano (Author), DePoy, D. L. (Author), Gould, Andrew (Author), Marshall, Jennifer L. (Author), Trueblood, Mark (Author), Trueblood, Patricia (Author), Johnson, John A. (Author), Wright, Jason (Author), McCrady, Nate (Author), Wittenmyer, Robert A. (Author), Johnson, Samson A. (Author), Sergi, Anthony (Author), Wilson, Maurice (Author) and Sliski, David H. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 154 (5), pp. 1-16 |
Article Number | 194 |
Number of Pages | 16 |
Year | 2017 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aa8f95 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aa8f95 |
Abstract | We report the discovery of KELT-20b, a hot Jupiter transiting a V ∼7.6 early A star, HD 185603, with an orbital period of P ≃3.47 days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating (v sin I∗ ≃ 120 km s-1 ) A2V star with an effective temperature of Teff=8730 -260 +250 K, mass of M∗+1.76-0.20 +0.14MO, radius of R∗= 1.561-0.064+0.058RO,surface gravity of log g ∗=4.292-0.020+0.017, and age of ≳600 Myr. The planetary companion has a radius of Rp=1.735 -0.075 +0.070Rj, a semimajor axis of a =0.0542-0.0021+0.0014 au, and a linear ephemeris of BJDTDB=2457503.120049 ± 0.000190+E(3.4741070± 0.0000019). We place a 3s upper limit of ∼ 3.5 MJ on the mass of the planet. Doppler tomographic measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star (l = 3 °.4± 2 °.1). The inclination of the star is constrained to 24°.4 > I ∗ > 155 °.6, implying a three-dimensional spin-orbit alignment of 1°.3 > ψ > 69°.8. KELT-20b receives an insolation flux of∼8× 109 erg s-1cm-2, implying an equilibrium temperature of of ∼ 2250 K, assuming zero albedo and complete heat redistribution. Due to the high stellar Teff, KELT-20b also receives an ultraviolet (wavelength d ≤ 91.2 nm) insolation flux of ∼9.1×104erg s-1 cm-2, possibly indicating significant atmospheric ablation. Together with WASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth A star host of a transiting giant planet, and the third brightest host (in V) of a transiting planet. |
Keywords | methods: observational; planets and satellites: detection; planets; and satellites: gaseous planets; stars: individual (HD 185603); techniques: photometric; techniques: radial velocities; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Vanderbilt University, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Ohio State University, United States | |
Princeton University, United States | |
School of Mathematics, Physics and Computing | |
Westminster College, United States | |
Swarthmore College, United States | |
Brigham Young University, United States | |
Lunae Astronomical Society, Italy | |
Atalaia Group and CROW Observatory, Portugal | |
National Aeronautics and Space Administration (NASA), United States | |
California Institute of Technology (Caltech), United States | |
Infrared Processing and Analysis Center (IPAC), United States | |
University of California, United States | |
Pennsylvania State University, United States | |
Las Cumbres Observatory, United States | |
Lehigh University, United States | |
South African Astronomical Observatory, South Africa | |
NASA Goddard Space Flight Center, United States | |
University of Washington, United States | |
University of Hawaii, United States | |
Wellesley College, United States | |
Hazelwood Observatory, Australia | |
Texas A&M University, United States | |
Winer Observatory, United States | |
University of Montana, United States | |
Computational Engineering and Science Research Centre | |
University of Pennsylvania, United States |
https://research.usq.edu.au/item/q6x4y/kelt-20b-a-giant-planet-with-a-period-of-p-3-5-days-transiting-the-v-7-6-early-a-star-hd-185603
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