2022A&A...666A.118J


Query : 2022A&A...666A.118J

2022A&A...666A.118J - Astronomy and Astrophysics, volume 666A, 118 (2022/10-1)

The stable climate of KELT-9b,.

JONES K., MORRIS B.M., DEMORY B.-O., HENG K., HOOTON M.J., BILLOT N., EHRENREICH D., HOYER S., SIMON A.E., LENDL M., DEMANGEON O.D.S., SOUSA S.G., BONFANTI A., WILSON T.G., SALMON S., CSIZMADIA S., PARVIAINEN H., BRUNO G., ALIBERT Y., ALONSO R., ANGLADA G., BARCZY T., BARRADO D., BARROS S.C.C., BAUMJOHANN W., BECK M., BECK T., BENZ W., BONFILS X., BRANDEKER A., BROEG C., CABRERA J., CHARNOZ S., COLLIER CAMERON A., DAVIES M.B., DELEUIL M., DELINE A., DELREZ L., ERIKSON A., FORTIER A., FOSSATI L., FRIDLUND M., GANDOLFI D., GILLON M., GUDEL M., ISAAK K.G., KISS L.L., LASKAR J., LECAVELIER DES ETANGS A., LOVIS C., MAGRIN D., MAXTED P.F.L., NASCIMBENI V., OLOFSSON G., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RATTI F., RAUER H., REIMERS C., RIBAS I., SANTOS N.C., SCANDARIATO G., SEGRANSAN D., SMITH A.M.S., STELLER M., SZABO G.M., THOMAS N., UDRY S., VAN GROOTEL V., WALTER I., WALTON N.A. and WANG JUNGO W.

Abstract (from CDS):

Even among the most irradiated gas giants, so-called ultra-hot Jupiters, KELT-9b stands out as the hottest planet thus far discovered with a dayside temperature of over 4500 K. At these extreme irradiation levels, we expect an increase in heat redistribution efficiency and a low Bond albedo owed to an extended atmosphere with molecular hydrogen dissociation occurring on the planetary dayside. We present new photometric observations of the KELT-9 system throughout 4 full orbits and 9 separate occultations obtained by the 30 cm space telescope CHEOPS. The CHEOPS bandpass, located at optical wavelengths, captures the peak of the thermal emission spectrum of KELT-9b. In this work we simultaneously analyse CHEOPS phase curves along with public phase curves from TESS and Spitzer to infer joint constraints on the phase curve variation, gravity-darkened transits, and occultation depth in three bandpasses, as well as derive 2D temperature maps of the atmosphere at three different depths. We find a day-night heat redistribution efficiency of ∼0.3 which confirms expectations of enhanced energy transfer to the planetary nightside due to dissociation and recombination of molecular hydrogen. We also calculate a Bond albedo consistent with zero. We find no evidence of variability of the brightness temperature of the planet, excluding variability greater than 1%

Abstract Copyright: © K. Jones et al. 2022

Journal keyword(s): techniques: photometric - instrumentation: photometers - planets and satellites: atmospheres - planets and satellites: gaseous planets - eclipses - occultations

VizieR on-line data: <Available at CDS (J/A+A/666/A118): occ0-df.dat-occ13-df.dat cheopsdf.dat tess-df.dat spit-df.dat>

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 10069b Pl 01 37 25.0332798696 -45 40 40.374717456           ~ 371 1
2 WASP-12b Pl 06 30 32.7966092352 +29 40 20.263502460           ~ 764 1
3 * rho01 Cnc e Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 576 1
4 WASP-189b Pl? 15 02 44.8678907928 -03 01 52.986571896           ~ 84 0
5 WASP-103b Pl 16 37 15.5765824488 +07 11 00.109678740           ~ 184 1
6 BD+47 2846b Pl 19 28 59.3538826128 +47 58 10.217007804           ~ 380 1
7 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1440 1
8 HD 195689b Pl 20 31 26.3534153736 +39 56 19.773037500           ~ 279 0
9 HD 195689 SB* 20 31 26.3534153736 +39 56 19.773037500   7.59 7.56     A0 121 0
10 HD 201585b Pl 21 10 12.3723073896 +10 44 19.949472816           ~ 47 0
11 HD 209458b Pl 22 03 10.7727465312 +18 53 03.549393384           ~ 1862 1

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