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The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS

Krenn, A. F. and Lendl, M. and Patel, J. A. and Carone, L. and Deleuil, M. and Sulis, S. and Collier Cameron, A. and Deline, A. and Guterman, P. and Queloz, D. and Fossati, L. and Brandeker, A. and Heng, K. and Akinsanmi, B. and Adibekyan, V. and Bonfanti, A. and Demangeon, O. D. S. and Kitzmann, D. and Salmon, S. 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, M. and Beck, T. and Benz, W. and Billot, N. and Blecha, L. and Bonfils, X. and Borsato, L. and Broeg, C. and Cabrera, J. and Charnoz, S. and Corral Van Damme, C. and Csizmadia, Sz. and Cubillos, P. E. and Davies, M. B. and Delrez, L. and Demory, B. -O. and Ehrenreich, D. and Erikson, A. and Farinato, J. and Fortier, A. and Fridlund, M. and Gandolfi, D. and Gillon, M. and Güdel, M. and Hoyer, S. and Isaak, K. G. and Kiss, L. L. and Kopp, E. and Laskar, J. and Lecavelier des Etangs, A. and Lovis, C. and Magrin, D. and Maxted, P. F. L. and Mordasini, C. and Nascimbeni, V. and Olofsson, G. and Ottensamer, R. and Pagano, I. and Palle, E. and Peter, G. and Piotto, G. and Pollacco, 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, A. M. S. and Steller, M. and Szabó, Gy. M. and Thomas, N. and Udry, S. and Ulmer, B. and Van Grootel, V. and Venturini, J. and Walton, N. A. (2023) The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS. Astronomy & Astrophysics, 672, A24. EDP Sciences. doi: 10.1051/0004-6361/202245016. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/full_html/2023/04/aa45016-22/aa45016-22.html

Abstract

Context. Measurements of the occultation of an exoplanet at visible wavelengths allow us to determine the reflective properties of a planetary atmosphere. The observed occultation depth can be translated into a geometric albedo. This in turn aids in characterising the structure and composition of an atmosphere by providing additional information on the wavelength-dependent reflective qualities of the aerosols in the atmosphere. Aims: Our aim is to provide a precise measurement of the geometric albedo of the gas giant HD 189733b by measuring the occultation depth in the broad optical bandpass of CHEOPS (350-1100 nm). Methods: We analysed 13 observations of the occultation of HD 189733b performed by CHEOPS utilising the Python package PyCHEOPS. The resulting occultation depth is then used to infer the geometric albedo accounting for the contribution of thermal emission from the planet. We also aid the analysis by refining the transit parameters combining observations made by the TESS and CHEOPS space telescopes. Results: We report the detection of an 24.7 ± 4.5 ppm occultation in the CHEOPS observations. This occultation depth corresponds to a geometric albedo of 0.076 ± 0.016. Our measurement is consistent with models assuming the atmosphere of the planet to be cloud-free at the scattering level and absorption in the CHEOPS band to be dominated by the resonant Na doublet. Taking into account previous optical-light occultation observations obtained with the Hubble Space Telescope, both measurements combined are consistent with a super-stellar Na elemental abundance in the dayside atmosphere of HD 189733b. We further constrain the planetary Bond albedo to between 0.013 and 0.42 at 3σ confidence. Conclusions: We find that the reflective properties of the HD 189733b dayside atmosphere are consistent with a cloud-free atmosphere having a super-stellar metal content. When compared to an analogous CHEOPS measurement for HD 209458b, our data hint at a slightly lower geometric albedo for HD 189733b (0.076 ± 0.016) than for HD 209458b (0.096 ± 0.016), or a higher atmospheric Na content in the same modelling framework. While our constraint on the Bond albedo is consistent with previously published values, we note that the higher-end values of ~0.4, as derived previously from infrared phase curves, would also require peculiarly high reflectance in the infrared, which again would make it more difficult to disentangle reflected and emitted light in the total observed flux, and therefore to correctly account for reflected light in the interpretation of those phase curves. Lower reported values for the Bond albedos are less affected by this ambiguity.

Item URL in elib:https://elib.dlr.de/194671/
Document Type:Article
Title:The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Krenn, A. F.Space Research Institute, Austrian Academy of Sciences, Schmiedl-strasse 6, 8042, Graz, Austria ; Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Lendl, M.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Patel, J. A.Department of Astronomy , Stockholm University, SE-106 91 Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Carone, L.Space Research Institute, Austrian Academy of Sciences, Schmiedl-strasse 6, 8042, Graz, AustriaUNSPECIFIEDUNSPECIFIED
Deleuil, M.Laboratoire d´Astrophysique de Marseille, FranceUNSPECIFIEDUNSPECIFIED
Sulis, S.Aix-Marseille Université, CNRS, CNES, Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388, Marseille, FranceUNSPECIFIEDUNSPECIFIED
Collier Cameron, A.SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UKhttps://orcid.org/0000-0002-8863-7828UNSPECIFIED
Deline, A.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIEDUNSPECIFIED
Guterman, P.Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIEDUNSPECIFIED
Queloz, D.Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0HE, UK; ETH Zurich, Department of Physics, Wolfgang-Pauli-Strasse 27, 8093, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Fossati, L.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austriahttps://orcid.org/0000-0003-4426-9530UNSPECIFIED
Brandeker, A.Department of Astronomy – Stockholm University, SE-106 91 Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Heng, K.Ludwig Maximilian University, University Observatory Munich, Scheinerstrasse 1, Munich, 81679, Germany; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; University of Bern, ARTORG Center for Biomedical Engineering ResUNSPECIFIEDUNSPECIFIED
Akinsanmi, B.Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Adibekyan, V.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIEDUNSPECIFIED
Bonfanti, A.Space Research Institute, Austrian Academy of Sciences, AustriaUNSPECIFIEDUNSPECIFIED
Demangeon, O. D. S.Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, PortugalUNSPECIFIEDUNSPECIFIED
Kitzmann, D.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Salmon, S.STAR, Université de Liège, BelgiumUNSPECIFIEDUNSPECIFIED
Sousa, S. G.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIEDUNSPECIFIED
Wilson, T. G.School of Physics and Astronomy, St. Andrews, UKhttps://orcid.org/0000-0001-8749-1962UNSPECIFIED
Alibert, Y.Physikalisches Institut, University of BernUNSPECIFIEDUNSPECIFIED
Alonso, R.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIEDUNSPECIFIED
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,SpainUNSPECIFIEDUNSPECIFIED
Bàrczy, T.Admatis, Miskolc, HungaryUNSPECIFIEDUNSPECIFIED
Barrado Navascues, D.Depto. de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC Campus, E-28692 Villanueva de la Cañada, Madrid, SpainUNSPECIFIEDUNSPECIFIED
Barros, S. C. C.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugalhttps://orcid.org/0000-0003-2434-3625UNSPECIFIED
Baumjohann, W.Space Research Institute, Austrian Academy of Sciences, Graz, Austriahttps://orcid.org/0000-0001-6271-0110UNSPECIFIED
Beck, M.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIEDUNSPECIFIED
Beck, T.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Benz, W.Physikalisches Institut, Universität Bern, CHUNSPECIFIEDUNSPECIFIED
Billot, N.Université de Genève, SwitzerlandUNSPECIFIEDUNSPECIFIED
Blecha, L.Almatech SA, EPFL Innovation Park, Bâtiment D, 1015, Lausanne, SwitzerlandUNSPECIFIEDUNSPECIFIED
Bonfils, X.Université Grenoble Alpes, FranceUNSPECIFIEDUNSPECIFIED
Borsato, L.Dipartimento di Fisica e Astronomia, Universita degli Studi di Padova, via Marzolo 8, 35131 Padova, Italyhttps://orcid.org/0000-0001-8627-9628UNSPECIFIED
Broeg, C.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Charnoz, S.Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, FranceUNSPECIFIEDUNSPECIFIED
Corral Van Damme, C.ESA/ESTEC, NiederlandeUNSPECIFIEDUNSPECIFIED
Csizmadia, Sz.UNSPECIFIEDhttps://orcid.org/0000-0001-6803-9698UNSPECIFIED
Cubillos, P. E.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8041 Graz, AustriaUNSPECIFIEDUNSPECIFIED
Davies, M. B.Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, 22100, Lund, SwedenUNSPECIFIEDUNSPECIFIED
Delrez, L.Institut d Astrophysique et de Geophysique, Universite de LiegeUNSPECIFIEDUNSPECIFIED
Demory, B. -O.Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Ehrenreich, D.Observatoire de Genève, University of Geneva, Switzerlandhttps://orcid.org/0000-0001-9704-5405UNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Farinato, J.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Fortier, A.Physikalisches Institut, University of Bern, Bern, Switzerlandhttps://orcid.org/0000-0001-8450-3374UNSPECIFIED
Fridlund, M.Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The NetherlandsUNSPECIFIEDUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, 10125, Torino, Italyhttps://orcid.org/0000-0001-8627-9628UNSPECIFIED
Gillon, M.Université de LiègeUNSPECIFIEDUNSPECIFIED
Güdel, M.Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, A-1180 Vienna, AustriaUNSPECIFIEDUNSPECIFIED
Hoyer, S.Instituto de Astrofísica de Canarias, C/ Vía Láctea s/n, 38205 La Laguna, SpainUNSPECIFIEDUNSPECIFIED
Isaak, K. G.ESA/ESTEC, Noordwijk, NiederlandeUNSPECIFIEDUNSPECIFIED
Kiss, L. L.Konkoly Observatory, Research Centre for Astronomy and Earth, Budapest, HungaryUNSPECIFIEDUNSPECIFIED
Kopp, E.UNSPECIFIEDhttps://orcid.org/0000-0003-3450-906XUNSPECIFIED
Laskar, J.IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ.,Sorbonne Univ., 77 av. Denfert-Rochereau, 75014 Paris, FranceUNSPECIFIEDUNSPECIFIED
Lecavelier des Etangs, A.Institut d Astrophysique de Paris, CNRS, UMR 7095 & Sorbonne Universites, UPMC Paris 6, 98 bis bd Arago, 75014 Paris, FranceUNSPECIFIEDUNSPECIFIED
Lovis, C.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Magrin, D.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Maxted, P. F. L.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UKUNSPECIFIEDUNSPECIFIED
Mordasini, C.Physikalisches Institut, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Nascimbeni, V.INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Olofsson, G.Department of Astronomy, Stockholm University, AlbaNova University Center, 10691 Stockholm, SwedenUNSPECIFIEDUNSPECIFIED
Ottensamer, R.University of Vienna, Department of Astrophysics, AustriaUNSPECIFIEDUNSPECIFIED
Pagano, I.INAF – Osservatorio Astrofisico di Catania, Via S.Sofia 78, 95123 Catania, ItalyUNSPECIFIEDUNSPECIFIED
Palle, E.Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, SpainUNSPECIFIEDUNSPECIFIED
Peter, G.UNSPECIFIEDhttps://orcid.org/0000-0001-6101-2513UNSPECIFIED
Piotto, G.INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Pollacco, D.Department of Physics, University of Warwick, Coventry CV4 7AL, UKUNSPECIFIEDUNSPECIFIED
Ragazzoni, R.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Rando, N.ESA/ESTEC, Noordwijk, NiederlandeUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, I.Institute d´Estudis Espacials de Catalunya and Instituto de Ciencias des Espacio, Barcelona, SpainUNSPECIFIEDUNSPECIFIED
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, PortugalUNSPECIFIEDUNSPECIFIED
Scandariato, G.INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, ItalyUNSPECIFIEDUNSPECIFIED
Segransan, D.Observatoire de Geneve, Universite de Geneve, SwitzerlandUNSPECIFIEDUNSPECIFIED
Simon, A. E.Physikalisches Institut, University of Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Smith, A. M. S.UNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341UNSPECIFIED
Steller, M.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIEDUNSPECIFIED
Szabó, Gy. M.Department of Experimental Physics & Astronomical Observatory, University of Szeged, Szeged, HungaryUNSPECIFIEDUNSPECIFIED
Thomas, N.Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, SwitzerlandUNSPECIFIEDUNSPECIFIED
Udry, S.Observatoire de GenèveUNSPECIFIEDUNSPECIFIED
Ulmer, B.Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, GermanyUNSPECIFIEDUNSPECIFIED
Van Grootel, V.STAR, Université de Liège, BelgiumUNSPECIFIEDUNSPECIFIED
Venturini, J.Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, 1290, Versoix, SwitzerlandUNSPECIFIEDUNSPECIFIED
Walton, N. A.Institute of Astronomy, University of Cambridge, Cambridge, UKUNSPECIFIEDUNSPECIFIED
Date:23 January 2023
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:672
DOI:10.1051/0004-6361/202245016
Page Range:A24
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:planets and satellites: atmospheres, techniques: photometric, planets and satellites: individual: HD 189733b, Astrophysics - Earth and Planetary 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 Planetary Research > Leitungsbereich PF
Institute of Optical Sensor Systems > Space Instruments
Deposited By: Smith, Dr Alexis M S
Deposited On:25 Apr 2023 14:35
Last Modified:04 Dec 2023 11:03

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