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The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve

Deline, A. and Hooton, M. J. and Lendl, M. and Morris, B. M. and Salmon, S. and Olofsson, G. and Broeg, C. and Ehrenreich, D. and Beck, M. and Brandeker, A. and Hoyer, S. and Sulis, S. and Van Grootel, V. and Bourrier, V. and Demangeon, O. and Demory, B. O. and Heng, K. and Parviainen, H. and Serrano, L. M. and Singh, V. and Bonfanti, A. and Fossati, L. and Kitzmann, D. and Sousa, S. G. and Wilson, T. G. and Alibert, Y. and Alonso, R. and Anglada Escudé, G. and Bàrczy, T. and Barrado Navascues, D. and Barros, S. C. C. and Baumjohann, W. and Beck, T. and Bekkelien, A. and Benz, W. and Billot, N. and Bonfils, X. and Cabrera, J. and Charnoz, S. and Collier Cameron, A. and Corral Van Damme, C. and Csizmadia, Sz. and Davies, M. B. and Deleuil, M. and Delrez, L. and De Roche, T. and Erikson, A. and Fortier, A. and Fridlund, M. and Futyan, D. and Gandolfi, D. and Gillon, M. and Güdel, M. and Gutermann, P. and Hasiba, J. and Isaak, K. G. and Kiss, L. and Laskar, J. and Lecavelier des Etangs, A. and Lovis, C. and Magrin, D. and Maxted, P. F. L. and Munari, M. and Nascimbeni, V. and Ottensamer, R. and Pagano, I. and Palle, E. and Peter, G. and Piotto, G. and Pollacco, D. and Queloz, D. and Ragazzoni, R. and Rando, N. and Rauer, H. and Ribas, I. and Santos, N. C. and Scandariato, G. and Segransan, D. and Simon, A. E. and Smith, Alexis M S and Steller, M. and Szabó, Gy. M. and Thomas, N. and Udry, S. and Walter, I. and Walton, N. A. (2022) The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve. Astronomy & Astrophysics, 659, A74. EDP Sciences. doi: 10.1051/0004-6361/202142400. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/full_html/2022/03/aa42400-21/aa42400-21.html

Abstract

Context. Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable to those of the coldest stars. These `ultra-hot Jupiters' have atmospheres made of ions and atomic species from molecular dissociation and feature strong day-to-night temperature gradients. Photometric observations at different orbital phases provide insights on the planet's atmospheric properties. Aims: We aim to analyse the photometric observations of WASP-189 acquired with the Characterising Exoplanet Satellite (CHEOPS) to derive constraints on the system architecture and the planetary atmosphere. Methods: We implemented a light-curve model suited for an asymmetric transit shape caused by the gravity-darkened photosphere of the fast-rotating host star. We also modelled the reflective and thermal components of the planetary flux, the effect of stellar oblateness and light-travel time on transit-eclipse timings, the stellar activity, and CHEOPS systematics. Results: From the asymmetric transit, we measure the size of the ultra-hot Jupiter WASP-189 b, Rp = 1.600−0.016+0.017 RJ, with a precision of 1%, and the true orbital obliquity of the planetary system, Ψp = 89.6 ± 1.2deg (polar orbit). We detect no significant hotspot offset from the phase curve and obtain an eclipse depth of δecl = 96.5−5.0+4.5 ppm, from which we derive an upper limit on the geometric albedo: Ag < 0.48. We also find that the eclipse depth can only be explained by thermal emission alone in the case of extremely inefficient energy redistribution. Finally, we attribute the photometric variability to the stellar rotation, either through superficial inhomogeneities or resonance couplings between the convective core and the radiative envelope. Conclusions: Based on the derived system architecture, we predict the eclipse depth in the upcoming Transiting Exoplanet Survey Satellite (TESS) observations to be up to ~165 ppm. High-precision detection of the eclipse in both CHEOPS and TESS passbands might help disentangle reflective and thermal contributions. We also expect the right ascension of the ascending node of the orbit to precess due to the perturbations induced by the stellar quadrupole moment J2 (oblateness).

Item URL in elib:https://elib.dlr.de/185754/
Document Type:Article
Title:The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Deline, A.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Hooton, M. J.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIED
Lendl, M.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, Switzerland; Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042, Graz, AustriaUNSPECIFIED
Morris, B. M.Center for Space and Habitability, University of Bern, SwitzerlandUNSPECIFIED
Salmon, S.STAR, Université de Liège, BelgiumUNSPECIFIED
Olofsson, G.Department of Astronomy, Stockholm University, AlbaNova University Center, 10691 Stockholm, SwedenUNSPECIFIED
Broeg, C.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIED
Ehrenreich, D.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Beck, M.Université de Genève, SwitzerlandUNSPECIFIED
Brandeker, A.Department of Astronomy , Stockholm University, SE-106 91 Stockholm, SwedenUNSPECIFIED
Hoyer, S.Laboratoire d’Astrophysique de Marseille, Univ. de Provence, FranceUNSPECIFIED
Sulis, S.Aix-Marseille Université, CNRS, CNES, Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388, Marseille, FranceUNSPECIFIED
Van Grootel, V.STAR, Université de Liège, BelgiumUNSPECIFIED
Bourrier, V.Université de Genève, SwitzerlandUNSPECIFIED
Demangeon, O.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIED
Demory, B. O.Center for Space and Habitability, University of Bern, SwitzerlandUNSPECIFIED
Heng, K.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIED
Parviainen, H.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Serrano, L. M.Dipartimento di Fisica, Università degli Studi di Torino, Via Pietro Giuria 1, 10125, Torino, ItalyUNSPECIFIED
Singh, V.INAF, Osservatorio Astrofisico di Catania, ItalyUNSPECIFIED
Bonfanti, A.Space Research Institute, Austrian Academy of Sciences, AustriaUNSPECIFIED
Fossati, L.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8041 Graz, AustriaUNSPECIFIED
Kitzmann, D.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIED
Sousa, S. G.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugalhttps://orcid.org/0000-0001-9047-2965
Wilson, T. G.School of Physics and Astronomy, St. Andrews, UKhttps://orcid.org/0000-0001-8749-1962
Alibert, Y.Physikalisches Institut, University of Bern;Observatoire de Besançon, Institut UTINAM, FranceUNSPECIFIED
Alonso, R.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIED
Anglada Escudé, G.Institut de Ciències de l’Espai (ICE, CSIC), Campus UAB, CanMagrans s/n, 08193 Bellaterra, Spain; Institut d’Estudis Espacials de Catalunya (IEEC), 08034 Barcelona,SpainUNSPECIFIED
Bàrczy, T.Admatis, Miskolc, HungaryUNSPECIFIED
Barrado Navascues, D.Depto. de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC Campus, E-28692 Villanueva de la Cañada, Madrid, SpainUNSPECIFIED
Barros, S. C. C.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIED
Baumjohann, W.Space Research Institute, Austrian Academy of Sciences, Graz, Austriahttps://orcid.org/0000-0001-6271-0110
Beck, T.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIED
Bekkelien, A.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Benz, W.Physics Institute, Space Research & Planetary Sciences, University of Bern, Sidlerstr. 5, CH-3012 Bern, SwitzerlandUNSPECIFIED
Billot, N.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Bonfils, X.Université Grenoble Alpes, FranceUNSPECIFIED
Cabrera, J.juan.cabrera (at) dlr.deUNSPECIFIED
Charnoz, S.Institut de Physique du Globe de Paris, FranceUNSPECIFIED
Collier Cameron, A.SUPA, School of Physics and Astronomy, University of St. Andrews, UKUNSPECIFIED
Corral Van Damme, C.ESA/ESTEC, NiederlandeUNSPECIFIED
Csizmadia, Sz.szilard.csizmadia (at) dlr.dehttps://orcid.org/0000-0001-6803-9698
Davies, M. B.Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, 22100, Lund, SwedenUNSPECIFIED
Deleuil, M.Aix-Marseille Universite, CNRS, CNES, LAM, Marseille, FranceUNSPECIFIED
Delrez, L.Institut d’Astrophysique et de Geophysique, Universite de Liege, BelgiumUNSPECIFIED
De Roche, T.Physikalisches Institut,University of Bern, Sidlerstraße 5, CH-3012 Bern, SwitzerlandUNSPECIFIED
Erikson, A.anders.erikson (at) dlr.deUNSPECIFIED
Fortier, A.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIED
Fridlund, M.Leiden Observatory, University of Leiden, P.O. Box 9513, NL-2300 RA, Leiden, The NetherlandsUNSPECIFIED
Futyan, D.Universite de Geneve, SwitzerlandUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, 10125, Torino, ItalyUNSPECIFIED
Gillon, M.Institut d’Astrophysique et de Géophysique, Sart-Tilman, B-4000 Liège, BelgiumUNSPECIFIED
Güdel, M.Department of Astrophysics, University of Vienna, Türkenschanzstraße 17, 1180, Vienna, AustriaUNSPECIFIED
Gutermann, P.Aix-Marseille Université, CNRS, CNES, Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388, Marseille, France; Division Technique, Institut National des Sciences de l'Univers (INSU), CS 20330, 83507, La Seyne-sur-Mer, FranceUNSPECIFIED
Hasiba, J.Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, AustriaUNSPECIFIED
Isaak, K. G.ESA/ESTEC, Noordwijk, NiederlandeUNSPECIFIED
Kiss, L.Konkoly Observatory, Research Centre for Astronomy and Earth, Budapest, HungaryUNSPECIFIED
Laskar, J.IMCCE, Obs. de ParisUNSPECIFIED
Lecavelier des Etangs, A.Institut d Astrophysique de Paris, CNRS, UMR 7095 & Sorbonne Universites, UPMC Paris 6, 98 bis bd Arago, 75014 Paris, FranceUNSPECIFIED
Lovis, C.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, SwitzerlandUNSPECIFIED
Magrin, D.INAF,OsservatorioAstronomicodiPadova,Vicolodell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Maxted, P. F. L.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UKUNSPECIFIED
Munari, M.INAF - Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, ItalyUNSPECIFIED
Nascimbeni, V.NAF - Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, Padova, IT-35122, ItalyUNSPECIFIED
Ottensamer, R.Dept. of Astrophysics, University of Vienna, AustriaUNSPECIFIED
Pagano, I.INAF - Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, ItalyUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, SpainUNSPECIFIED
Peter, G.Gisbert.Peter (at) dlr.deUNSPECIFIED
Piotto, G.INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Pollacco, D.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UKUNSPECIFIED
Queloz, D.Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UKUNSPECIFIED
Ragazzoni, R.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Rando, N.ESA/ESTEC, Noordwijk, NiederlandeUNSPECIFIED
Rauer, H.Heike.Rauer (at) dlr.deUNSPECIFIED
Ribas, I.Institut de Ciencies de l'Espai (ICE, CSIC), Campus UAB,C/ de Can Magrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), C/ Gran Capita 2-4, 08034, Barcelona, SpainUNSPECIFIED
Santos, N. C.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal; Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, PortugalUNSPECIFIED
Scandariato, G.NAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, ItalyUNSPECIFIED
Segransan, D.Observatoire de Geneve, Universite de Geneve, 51 Chemin des Maillettes, 1290 Sauverny, SwitzerlandUNSPECIFIED
Simon, A. E.Physikalisches Institut, University of Bern, SwitzerlandUNSPECIFIED
Smith, Alexis M SAlexis.Smith (at) dlr.dehttps://orcid.org/0000-0002-2386-4341
Steller, M.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIED
Szabó, Gy. M.Department of Experimental Physics & Astronomical Observatory, University of Szeged, Szeged, HungaryUNSPECIFIED
Thomas, N.Physikalisches Institut, Universitaet Bern, Sidlerstrasse 5, Bern, 3012 SwitzerlandUNSPECIFIED
Udry, S.Observatoire astronomique de l Universite de GeneveUNSPECIFIED
Walter, I.ingo.walter (at) dlr.deUNSPECIFIED
Walton, N. A.Institute of Astronomy, University of Cambridge, Cambridge, UKUNSPECIFIED
Date:2022
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:659
DOI :10.1051/0004-6361/202142400
Page Range:A74
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:techniques: photometric, planets and satellites: atmospheres, planets and satellites: individual: WASP-189 b, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - CHEOPS Science, R - Project CHEOPS
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Optical Sensor Systems
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Smith, Dr Alexis M S
Deposited On:25 Mar 2022 08:55
Last Modified:25 Mar 2022 08:55

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