2022A&A...668A..93P

Query : 2022A&A...668A..93P

2022A&A...668A..93P - Astronomy and Astrophysics, volume 668A, 93 (2022/12-1)

CHEOPS finds KELT-1b darker than expected in visible light Discrepancy between the CHEOPS and TESS eclipse depths.

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

Abstract (from CDS):

Recent studies based on photometry from the Transiting Exoplanet Survey Satellite (TESS) have suggested that the dayside of KELT-1b, a strongly irradiated brown dwarf, is significantly brighter in visible light than what would be expected based on Spitzer observations in the infrared. We observed eight eclipses of KELT-1b with CHaracterising ExOPlanet Satellite (CHEOPS) to measure its dayside brightness temperature in the bluest passband observed so far, and we jointly modelled the CHEOPS photometry with the existing optical and near-infrared photometry from TESS, LBT, CFHT, and Spitzer. Our modelling has led to a self-consistent dayside spectrum for KELT-1b covering the CHEOPS, TESS, H, Ks, and Spitzer IRAC 3.6 and 4.5 µm bands, where our TESS, H, Ks, and Spitzer band estimates largely agree with the previous studies. However, we discovered a strong discrepancy between the CHEOPS and TESS bands. The CHEOPS observations yield a higher photometric precision than the TESS observations, but they do not show a significant eclipse signal, while a deep eclipse is detected in the TESS band. The derived TESS geometric albedo of 0.36–0.13+0.12 is difficult to reconcile with a CHEOPS geometric albedo that is consistent with zero because the two passbands have considerable overlap. Variability in cloud cover caused by the transport of transient nightside clouds to the dayside could provide an explanation for reconciling the TESS and CHEOPS geometric albedos, but this hypothesis needs to be tested by future observations.

Abstract Copyright: © H. Parviainen et al. 2022

Journal keyword(s): stars: individual: KELT-1 - brown dwarfs - planetary systems - stars: atmospheres - methods: observational

VizieR on-line data: <Available at CDS (J/A+A/668/A93): visit1.dat-visit8.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 KELT-1b Pl 00 01 26.9168207928 +39 23 01.784206464           ~ 121 0
2 KELT-1 EB* 00 01 26.9168207928 +39 23 01.784206464   11.23 10.63     F5 60 0
3 BD+01 316b Pl 01 46 31.8575937456 +02 42 02.030065560           ~ 205 0
4 HD 15082b Pl 02 26 51.0582618096 +37 33 01.736482032           ~ 337 1
5 TOI-263b Pl 02 28 25.9518748896 -25 05 50.545991256           ~ 13 0
6 CD-38 3220b Pl 07 10 24.0604565856 -39 05 50.571250476           ~ 297 0
7 WASP-189b Pl? 15 02 44.8678907928 -03 01 52.986571896           ~ 82 0
8 Kepler-1b Pl 19 07 14.0375836512 +49 18 59.091482160           ~ 330 2
9 Kepler-7b Pl 19 14 19.5623105760 +41 05 23.367379128           ~ 205 1
10 HD 185603b Pl 19 38 38.7352230144 +31 13 09.217127532           ~ 127 0
11 NGTS-7Ab BD? 23 30 05.2358629579 -38 58 11.462828113           ~ 18 0

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