2017AJ....154..194L


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET21:02:41

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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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 KELT-1b Pl 00 01 26.9169325133 +39 23 01.782142922           ~ 64 0
2 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 203 1
3 HD 15082 dS* 02 26 51.0582746497 +37 33 01.737746137   8.41 8.14     kA5hA8mF4 140 1
4 BD+14 1881 * 08 22 28.2047273887 +13 44 07.144536685   9.53 9.23   8.948 A2 16 0
5 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 981 1
6 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 686 0
7 BD+10 3472b Pl 18 18 58.4251610587 +10 35 50.127796088           ~ 17 0
8 BD+10 3472 ** 18 18 58.4251610587 +10 35 50.127796088   10.96 10.64   10.007 ~ 17 0
9 BD+46 2629 Er* 19 07 53.104944 +46 52 06.00420   10.12 9.70 9.80   A0 132 0
10 BD+46 2629A * 19 07 53.1396671301 +46 52 05.931203366           ~ 30 1
11 SNR G065.2+05.7 SNR 19 33.0 +31 10           ~ 89 0
12 HD 185603b Pl 19 38 38.7352870670 +31 13 09.215701765           ~ 40 0
13 HD 185603 * 19 38 38.7352870670 +31 13 09.215701765   7.67 7.58     A0 20 0
14 Ass Cyg OB 3 As* 20 07 +35.9           ~ 168 0
15 Ass Cyg OB 8 As* 20 15 +40.9           ~ 63 0
16 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 248 1
17 Ass Cyg OB 9 As* 20 21 +39.9           ~ 120 0
18 NGC 6914 HII 20 25 +42.3           ~ 21 0
19 HD 195689b Pl 20 31 26.3534038246 +39 56 19.765154336           ~ 101 0
20 HD 195689 * 20 31 26.3534038246 +39 56 19.765154336   7.59 7.56     A0 52 0
21 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 801 0
22 IC 5070 HII 20 51.0 +44 22           ~ 180 1
23 NGC 7000 HII 20 58 47 +44 19.8           ~ 365 1
24 Ass Cyg OB 7 As* 21 08 +47.6           ~ 195 0
25 NAME IV CYG ASSOC. As* 21 15 +37.9           ~ 42 0
26 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1079 1
27 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 909 0
28 NAME Local Arm reg ~ ~           ~ 383 0
29 NAME Ori Arm PoG ~ ~           ~ 179 0
30 Ass Cyg OB 6 As* ~ ~           ~ 14 0
31 Ass Cyg OB 5 As* ~ ~           ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-21:02:41

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