SIMBAD references

2017AJ....154..194L - Astron. J., 154, 194-194 (2017/November-0)

KELT-20b: a giant planet with a period of p ∼ 3.5 days transiting the V ∼ 7.6 early A star HD 185603.

LUND M.B., RODRIGUEZ J.E., ZHOU G., GAUDI B.S., STASSUN K.G., JOHNSON M.C., BIERYLA A., OELKERS R.J., STEVENS D.J., COLLINS K.A., PENEV K., QUINN S.N., LATHAM D.W., VILLANUEVA S., EASTMAN J.D., KIELKOPF J.F., OBERST T.E., JENSEN E.L.N., COHEN D.H., JONER M.D., STEPHENS D.C., RELLES H., CORFINI G., GREGORIO J., ZAMBELLI R., ESQUERDO G.A., CALKINS M.L., BERLIND P., CIARDI D.R., DRESSING C., PATEL R., GAGNON P., GONZALES E., BEATTY T.G., SIVERD R.J., LABADIE-BARTZ J., KUHN R.B., COLON K.D., JAMES D., PEPPER J., FULTON B.J., McLEOD K.K., STOCKDALE C., CALCHI NOVATI S., DEPOY D.L., GOULD A., MARSHALL J.L., TRUEBLOOD M., TRUEBLOOD P., JOHNSON J.A., WRIGHT J., McCRADY N., WITTENMYER R.A., JOHNSON S.A., SERGI A., WILSON M. and SLISKI D.H.

Abstract (from CDS):

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 (vsinI*≃120 km s–1) A2V star with an effective temperature of Teff=8730–260+250 K, mass of M*=1.76–0.20+0.14  M, radius of R*=1.561–0.064+0.058  R, surface gravity of logg*=4.292–0.020+0.017, and age of 600 Myr. The planetary companion has a radius of RP=1.735–0.075+0.070  RJ, 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 3σ 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 (λ=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 ψ69○ / . 8. KELT-20b receives an insolation flux of ∼8×109 erg s–1 cm–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 ∼9.1×104 erg 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.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): methods: observational - planets and satellites: detection - planets and satellites: gaseous planets - stars: individual: HD 185603 - techniques: photometric - techniques: radial velocities - techniques: radial velocities

Simbad objects: 31

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2019.10.23-08:15:33

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