Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS

Autor(en)

G. Scandariato, V. Singh, D. Kitzmann, M. Lendl, A. Brandeker, G. Bruno, A. Bekkelien, W. Benz, P. Gutermann, P. F.L. Maxted, A. Bonfanti, S. Charnoz, M. Fridlund, K. Heng, S. Hoyer, I. Pagano, C. M. Persson, S. Salmon, V. Van Grootel, T. G. Wilson, J. Asquier, M. Bergomi, L. Gambicorti, J. Hasiba, Y. Alibert, R. Alonso, G. Anglada, T. Bárczy, D. Barrado Y Navascues, S. C.C. Barros, W. Baumjohann, M. Beck, T. Beck, N. Billot, X. Bonfils, C. Broeg, J. Cabrera, A. Collier Cameron, Sz Csizmadia, M. B. Davies, M. Deleuil, A. Deline, L. Delrez, O. Demangeon, B. O. Demory, A. Erikson, A. Fortier, L. Fossati, D. Gandolfi, M. Gillon, M. Güdel, K. G. Isaak, L. L. Kiss, J. Laskar, A. Lecavelier Des Etangs, C. Lovis, D. Magrin, V. Nascimbeni, G. Olofsson, R. Ottensamer, E. Pallé, H. Parviainen, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, N. C. Santos, D. Ségransan, L. M. Serrano, A. E. Simon, A. M.S. Smith, S. G. Sousa, M. Steller, Gy M. Szabó, N. Thomas, S. Udry, B. Ulmer, N. Walton

Abstrakt

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 80a-? 50+60 ppm in the CHEOPS and TESS passbands, respectively, with an eastward phase shift of ~50 (1.5Ï ? 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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

INAF-Osservatorio Astrofisico di Catania, Universität Bern, Universität Genf, Stockholm University, Aix-Marseille Université, National Institute for Earth Sciences & Astronomy (INSU-CNRS), Keele University, Österreichische Akademie der Wissenschaften (ÖAW), Université de Paris, Leiden University, Chalmers University of Technology, University of Warwick, University of St. Andrews, European Space Research & Technology Centre (ESA/ESTEC), INAF - Osservatorio Astronomico di Padova, European Space Astronomy Centre (ESA), Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), Admatis, Universidade do Porto, Université Grenoble-Alpes, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Lund University, Université de Liège, Università degli Studi di Torino, MTA Társadalomtudományi Kutatóközpont, Eötvös Loránd University Budapest, Université de recherche Paris Sciences et Lettres, Université Paris VI - Pierre-et-Marie-Curie, Università degli Studi di Padova, Eidgenössische Technische Hochschule Zürich, University of Cambridge, Technische Universität Berlin, Freie Universität Berlin (FU)

Journal

Astronomy and Astrophysics

Band

668

Anzahl der Seiten

33

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/202243974

Publikationsdatum

12-2022

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik, 103038 Weltraumforschung

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/755142b9-712a-4862-b8a4-8df00346c608