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CHEOPS geometric albedo of the hot Jupiter HD 209458 b

Brandeker, A. and Heng, K. and Lendl, M. and Patel, J. A. and Morris, B. M. and Broeg, C. and Guterman, P. and Beck, M. and Maxted, P. F. L. and Demangeon, O. and Delrez, L. and Demory, B. -O. and Kitzmann, D. and Santos, N. C. and Singh, V. and Alibert, Y. and Alonso, R. and Anglada Escudé, G. and Bàrczy, T. and Barrado y Navascués, D. and Barros, S. C. C. and Baumjohann, W. and Beck, T. and Benz, W. and Billot, N. and Bonfils, X. and Bruno, G. 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 Deline, A. and Ehrenreich, D. and Erikson, A. and Farinato, J. and Fortier, A. and Fossati, L. and Fridlund, M. and Gandolfi, D. and Gillon, M. and Güdel, M. and Hoyer, S. and Isaak, K. G. and Kiss, L. and Laskar, J. and Lecavelier des Etangs, A. and Lovis, C. and Luntzer, A. and Magrin, D. 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 Queloz, D. and Ragazzoni, R. and Rando, N. and Rauer, H. and Ribas, I. and Scandariato, G. and Segransan, D. and Simon, A. E. and Smith, Alexis M S and Sousa, S. G. and Steller, M. and Szabo, G. M. and Thomas, N. and Udry, S. and Van Grootel, V. and Walton, N. A. and Wolter, D. (2022) CHEOPS geometric albedo of the hot Jupiter HD 209458 b. Astronomy & Astrophysics, 659, L4. EDP Sciences. doi: 10.1051/0004-6361/202243082. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/full_html/2022/03/aa43082-22/aa43082-22.html

Abstract

We report the detection of the secondary eclipse of the hot Jupiter HD 209458 b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4−3.3+3.2 parts per million translates into a geometric albedo of Ag = 0.096 ± 0.016. The previously estimated dayside temperature of about 1500 K implies that our geometric albedo measurement consists predominantly of reflected starlight and is largely uncontaminated by thermal emission. This makes the present result one of the most robust measurements of Ag for any exoplanet. Our calculations of the bandpass-integrated geometric albedo demonstrate that the measured value of Ag is consistent with a cloud-free atmosphere, where starlight is reflected via Rayleigh scattering by hydrogen molecules, and the water and sodium abundances are consistent with stellar metallicity. We predict that the bandpass-integrated TESS geometric albedo is too faint to detect and that a phase curve of HD 209458 b observed by CHEOPS would have a distinct shape associated with Rayleigh scattering if the atmosphere is indeed cloud free.

Item URL in elib:https://elib.dlr.de/185756/
Document Type:Article
Title:CHEOPS geometric albedo of the hot Jupiter HD 209458 b
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Brandeker, A.Department of Astronomy , Stockholm University, SE-106 91 Stockholm, SwedenUNSPECIFIED
Heng, K.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIED
Lendl, M.Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, CH-1290 Sauverny, Switzerland; Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, A-8042 Graz, AustriaUNSPECIFIED
Patel, J. A.Department of Astronomy , Stockholm University, SE-106 91 Stockholm, SwedenUNSPECIFIED
Morris, B. M.Center for Space and Habitability, University of Bern, SwitzerlandUNSPECIFIED
Broeg, C.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIED
Guterman, P.Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Beck, M.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Maxted, P. F. L.Astrophysics Group, Keele University, Staffordshire ST5 5BG, UKUNSPECIFIED
Demangeon, O.Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, PortugalUNSPECIFIED
Delrez, L.Institut d’Astrophysique et de Geophysique, Universite de Liege, BelgiumUNSPECIFIED
Demory, B. -O.Center for Space and Habitability, University of Bern, SwitzerlandUNSPECIFIED
Kitzmann, D.Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, SwitzerlandUNSPECIFIED
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
Singh, V.INAF, Osservatorio Astrofisico di Catania, ItalyUNSPECIFIED
Alibert, Y.Physikalisches Institut, University of Bern;Observatoire de Besançon, Institut UTINAM, FranceUNSPECIFIED
Alonso, R.Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, Tenerife, 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 y Navascués, D.Depto. de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, 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
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
Bruno, G.Physikalisches Institut,University of Bern, Sidlerstraße 5, CH-3012 Bern, SwitzerlandUNSPECIFIED
Cabrera, J.UNSPECIFIEDUNSPECIFIED
Charnoz, S.Institut de Physique du Globe de Paris, FranceUNSPECIFIED
Collier Cameron, A.SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UKUNSPECIFIED
Corral Van Damme, C.ESA/ESTEC, NiederlandeUNSPECIFIED
Csizmadia, Sz.UNSPECIFIEDhttps://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
Deline, A.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Ehrenreich, D.Observatoire de Genève, University of Geneva, SwitzerlandUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIED
Farinato, J.INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Fortier, A.Physikalisches Institut, University of Bern, Bern, SwitzerlandUNSPECIFIED
Fossati, L.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8041 Graz, AustriaUNSPECIFIED
Fridlund, M.Leiden Observatory, University of Leiden, P.O. Box 9513, NL-2300 RA, Leiden, The NetherlandsUNSPECIFIED
Gandolfi, D.Dipartimento di Fisica, Universitadi Torino, via P. Giuria 1, I-10125 Torino, ItalyUNSPECIFIED
Gillon, M.Institut d'Astrophysique et de Géophysique, Universitée de Liège, Allée du 6 août 17, B-4000 Liège, BelgiumUNSPECIFIED
Güdel, M.University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180, Vienna, AustriaUNSPECIFIED
Hoyer, S.Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Frédéric Joliot-Curie, 13388 Marseille, Francehttps://orcid.org/0000-0003-3477-2466
Isaak, K. G.ESA/ESTEC, Noordwijk, NiederlandeUNSPECIFIED
Kiss, L.Konkoly Observatory, Research Centre for Astronomy and Earth, Budapest, HungaryUNSPECIFIED
Laskar, J.IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ.,Sorbonne Univ., 77 av. Denfert-Rochereau, 75014 Paris, FranceUNSPECIFIED
Lecavelier des Etangs, A.Institut d’Astrophysique de Paris, FranceUNSPECIFIED
Lovis, C.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, SwitzerlandUNSPECIFIED
Luntzer, A.University of Vienna, AustriaUNSPECIFIED
Magrin, D.INAF, Astronomical Institute, Padua, ItalyUNSPECIFIED
Nascimbeni, V.Dipartimento di Fisica ed Astronomia, Universitá degli Studi di Padova, Vicolo dell'Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Olofsson, G.Department of Astronomy, Stockholm University, AlbaNova University Center, 10691 Stockholm, SwedenUNSPECIFIED
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.UNSPECIFIEDUNSPECIFIED
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.UNSPECIFIEDUNSPECIFIED
Ribas, I.Institute d´Estudis Espacials de Catalunya and Instituto de Ciencias des Espacio, Barcelona, SpainUNSPECIFIED
Scandariato, G.NAF – Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, ItalyUNSPECIFIED
Segransan, D.Observatoire de Geneve, Universite de Geneve, SwitzerlandUNSPECIFIED
Simon, A. E.Center for Space and Habitability, University of Bern, SwitzerlandUNSPECIFIED
Smith, Alexis M SUNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341
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
Steller, M.Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, AustriaUNSPECIFIED
Szabo, G. M.Konkoly Observatory, Budapest, HungaryUNSPECIFIED
Thomas, N.Physikalisches Institut, Uni Bern Siedlerstrasse, Bern, 3012 SwitzerlandUNSPECIFIED
Udry, S.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290 Versoix, SwitzerlandUNSPECIFIED
Van Grootel, V.STAR, Université de Liège, BelgiumUNSPECIFIED
Walton, N. A.Institute of Astronomy, University of Cambridge, Cambridge, UKUNSPECIFIED
Wolter, D.UNSPECIFIEDUNSPECIFIED
Date:2022
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:659
DOI:10.1051/0004-6361/202243082
Page Range:L4
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:techniques: photometric, planetary systems, planets and satellites: atmospheres, planets and satellites: individual: HD 209458 b, 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 Optical Sensor Systems
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Smith, Dr Alexis M S
Deposited On:25 Mar 2022 08:59
Last Modified:25 Mar 2022 08:59

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