Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS
Date
01/12/2022Author
Funder
Grant ID
ST/R00824/1
ST/V000861/1
ST/R003203/1
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Abstract
Context. Observations of the phase curves and secondary eclipses of extrasolar planets provide a window onto the composition and thermal structure of the planetary atmospheres. For example, the photometric observations of secondary eclipses lead to the measurement of the planetary geometric albedo, Ag, which is an indicator of the presence of clouds in the atmosphere. Aims. In this work, we aim to measure the Ag in the optical domain of WASP-43b, a moderately irradiated giant planet with an equilibrium temperature of ~1400 K. Methods. For this purpose, we analyzed the secondary eclipse light curves collected by CHEOPS together with TESS along with observations of the system and the publicly available photometry obtained with HST WFC3/UVIS. We also analyzed the archival infrared observations of the eclipses and retrieve the thermal emission spectrum of the planet. By extrapolating the thermal spectrum to the optical bands, we corrected for the optical eclipses for thermal emission and derived the optical Ag. Results. The fit of the optical data leads to a marginal detection of the phase-curve signal, characterized by an amplitude of 160 ± 60 ppm and 80-50+60 ppm in the CHEOPS and TESS passbands, respectively, with an eastward phase shift of ~50° (1.5σ detection). The analysis of the infrared data suggests a non-inverted thermal profile and solar-like metallicity. The combination of the optical and infrared analyses allows us to derive an upper limit for the optical albedo of Ag< 0.087, with a confidence of 99.9%. Conclusions. Our analysis of the atmosphere of WASP-43b places this planet in the sample of irradiated hot Jupiters, with monotonic temperature-pressure profile and no indication of condensation of reflective clouds on the planetary dayside.
Citation
Scandariato , G , Singh , V , Kitzmann , D , Lendl , M , Brandeker , A , Bruno , G , Bekkelien , A , Benz , W , Gutermann , P , Maxted , P F L , Bonfanti , A , Charnoz , S , Fridlund , M , Heng , K , Hoyer , S , Pagano , I , Persson , C M , Salmon , S , Van Grootel , V , Wilson , T G , Asquier , J , Bergomi , M , Gambicorti , L , Hasiba , J , Alibert , Y , Alonso , R , Anglada , G , Bárczy , T , Barrado Y Navascues , D , Barros , S C C , Baumjohann , W , Beck , M , Beck , T , Billot , N , Bonfils , X , Broeg , C , Cabrera , J , Collier Cameron , A , Csizmadia , S , Davies , M B , Deleuil , M , Deline , A , Delrez , L , Demangeon , O , Demory , B-O , Erikson , A , Fortier , A , Fossati , L , Gandolfi , D , Gillon , M , Güdel , M , Isaak , K G , Kiss , L L , Laskar , J , Lecavelier Des Etangs , A , Lovis , C , Magrin , D , Nascimbeni , V , Olofsson , G , Ottensamer , R , Pallé , E , Parviainen , H , Peter , G , Piotto , G , Pollacco , D , Queloz , D , Ragazzoni , R , Rando , N , Rauer , H , Ribas , I , Santos , N C , Ségransan , D , Serrano , L M , Simon , A E , Smith , A M S , Sousa , S G , Steller , M , Szabó , G M , Thomas , N , Udry , S , Ulmer , B & Walton , N 2022 , ' Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS ' , Astronomy and Astrophysics , vol. 668 , A17 . https://doi.org/10.1051/0004-6361/202243974
Publication
Astronomy and Astrophysics
Status
Peer reviewed
ISSN
0004-6361Type
Journal article
Rights
Copyright © G. Scandariato et al. 2022. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Description
Funding: A.C.C. and T.W. acknowledge support from STFC consolidated grant numbers ST/R000824/1 and ST/V000861/1, and UKSA grant number ST/R003203/1.Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
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