CHEOPS geometric albedo of the hot Jupiter HD 209458 b

A. Brandeker; K. Heng; M. Lendl; J. A. Patel; B. M. Morris; C. Broeg; P. Guterman; M. Beck; P. F.L. Maxted; O. Demangeon; L. Delrez; B. O. Demory; D. Kitzmann; N. C. Santos; V. Singh; Y. Alibert; R. Alonso; G. Anglada; T. Bárczy; D. Barrado y Navascues; S. C.C. Barros; W. Baumjohann; T. Beck; W. Benz; N. Billot; X. Bonfils; G. Bruno; J. Cabrera; S. Charnoz; A. Collier Cameron; C. Corral van Damme; Sz Csizmadia; M. B. Davies; M. Deleuil; A. Deline; D. Ehrenreich; A. Erikson; J. Farinato; A. Fortier; L. Fossati; M. Fridlund; D. Gandolfi; M. Gillon; M. Güdel; S. Hoyer; K. G. Isaak; L. Kiss; J. Laskar; A. Lecavelier des Etangs; C. Lovis; A. Luntzer; D. Magrin; V. Nascimbeni; G. Olofsson; R. Ottensamer; I. Pagano; E. Pallé; G. Peter; G. Piotto; D. Pollacco; D. Queloz; R. Ragazzoni; N. Rando; H. Rauer; I. Ribas; G. Scandariato; D. Ségransan; A. E. Simon; A. M.S. Smith; S. G. Sousa; M. Steller; G. M. Szabó; N. Thomas; S. Udry; V. van Grootel; N. Walton; D. Wolter

doi:10.1051/0004-6361/202243082

CHEOPS geometric albedo of the hot Jupiter HD 209458 b

A. Brandeker
, K. Heng
, M. Lendl
, J. A. Patel
, B. M. Morris
, C. Broeg
, P. Guterman
, M. Beck
, P. F.L. Maxted
, O. Demangeon
, L. Delrez
, B. O. Demory
, D. Kitzmann
, N. C. Santos
, V. Singh
, Y. Alibert
, R. Alonso
, G. Anglada
, T. Bárczy
, D. Barrado y Navascues

S. C.C. Barros, W. Baumjohann, T. Beck, W. Benz, N. Billot, X. Bonfils, G. Bruno, J. Cabrera, S. Charnoz, A. Collier Cameron, C. Corral van Damme, Sz Csizmadia, M. B. Davies, M. Deleuil, A. Deline, D. Ehrenreich, A. Erikson, J. Farinato, A. Fortier, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Güdel, S. Hoyer, K. G. Isaak, L. Kiss, J. Laskar, A. Lecavelier des Etangs, C. Lovis, A. Luntzer, D. Magrin, V. Nascimbeni, G. Olofsson, R. Ottensamer, I. Pagano, E. Pallé, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, G. Scandariato, D. Ségransan, A. E. Simon, A. M.S. Smith, S. G. Sousa, M. Steller, G. M. Szabó, N. Thomas, S. Udry, V. van Grootel, N. Walton, D. Wolter

Department of Astronomy
Stockholm University
Center for Space and Habitability
University of Warwick
Université de Genève
University of Bern
LAM
Division Technique INSU
Astrophysics Group
Keele University
Ipatimup Diagnósticos
Departamento de Fisica e Astronomia
Astrobiology Research Unit
University of Liège
INAF Osservatorio Astronomico di Padova
Instituto de Astrofisica de Canarias
Departamento de Astrofisica
Research Unit; CIBERNED and Universidad de La Laguna
Campus UAB
Institut d’Estudis Espacials de Catalunya (IEEC)
Admatis Ltd.
Depto. de Astrofisica
ESAC campus
Space Research Institute
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
DLR
Laboratoire de Probabilités et Modèles Aléatoires
University of St Andrews
ESTEC - European Space Research and Technology Centre
Lund University
University of Leiden
Department of Space
Onsala Space Observatory
Dipartimento di Fisica
University of Turin
Department of Astrophysics
University of Vienna
Science and Operations Department - Science Division (SCI-SC)
Konkoly Observatory
Institute of Physics
Eötvös Loránd University
Sorbonne Univ.
Institut d’Astrophysique de Paris
INAF Osservatorio Astrofisico di Catania
Institute of Optical Sensor Systems
Dipartimento di Fisica “Galileo Galilei”
University of Padova
University of Cambridge
Department of Physics
ETH Zurich
Center for Astronomy and Astrophysics
TU Berlin
Free University of Berlin
MTA-ELTE Lendület “Momentum” Milky Way Research Group
Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

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^+3.2_-3.3 parts per million translates into a geometric albedo of A_g = 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 A_g for any exoplanet. Our calculations of the bandpass-integrated geometric albedo demonstrate that the measured value of A_g 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.

Original language	English
Article number	L4
Journal	Astronomy and Astrophysics
Volume	659
DOIs	https://doi.org/10.1051/0004-6361/202243082
Publication status	Published - 1 Mar 2022
Externally published	Yes

Keywords

Planetary systems
Planets
Planets and satellites: Atmospheres
Satellites: Individual: HD 209458 b
Techniques: Photometric

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10.1051/0004-6361/202243082

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Brandeker, A., Heng, K., Lendl, M., Patel, J. A., Morris, B. M., Broeg, C., Guterman, P., Beck, M., Maxted, P. F. L., Demangeon, O., Delrez, L., Demory, B. O., Kitzmann, D., Santos, N. C., Singh, V., Alibert, Y., Alonso, R., Anglada, G., Bárczy, T., ... Wolter, D. (2022). CHEOPS geometric albedo of the hot Jupiter HD 209458 b. Astronomy and Astrophysics, 659, Article L4. https://doi.org/10.1051/0004-6361/202243082

@article{aa916b5f51984b5184461b028adc0a0a,

title = "CHEOPS geometric albedo of the hot Jupiter HD 209458 b",

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+3.2-3.3 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.",

keywords = "Planetary systems, Planets, Planets and satellites: Atmospheres, Satellites: Individual: HD 209458 b, Techniques: Photometric",

author = "A. Brandeker and K. Heng and M. Lendl and Patel, \{J. A.\} and Morris, \{B. M.\} and C. Broeg and P. Guterman and M. Beck and Maxted, \{P. F.L.\} and O. Demangeon and L. Delrez and Demory, \{B. O.\} and D. Kitzmann and Santos, \{N. C.\} and V. Singh and Y. Alibert and R. Alonso and G. Anglada and T. B{\'a}rczy and \{Barrado y Navascues\}, D. and Barros, \{S. C.C.\} and W. Baumjohann and T. Beck and W. Benz and N. Billot and X. Bonfils and G. Bruno and J. Cabrera and S. Charnoz and \{Collier Cameron\}, A. and \{Corral van Damme\}, C. and Sz Csizmadia and Davies, \{M. B.\} and M. Deleuil and A. Deline and D. Ehrenreich and A. Erikson and J. Farinato and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. G{\"u}del and S. Hoyer and Isaak, \{K. G.\} and L. Kiss and J. Laskar and \{Lecavelier des Etangs\}, A. and C. Lovis and A. Luntzer and D. Magrin and V. Nascimbeni and G. Olofsson and R. Ottensamer and I. Pagano and E. Pall{\'e} and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and G. Scandariato and D. S{\'e}gransan and Simon, \{A. E.\} and Smith, \{A. M.S.\} and Sousa, \{S. G.\} and M. Steller and Szab{\'o}, \{G. M.\} and N. Thomas and S. Udry and \{van Grootel\}, V. and N. Walton and D. Wolter",

note = "Publisher Copyright: {\textcopyright} ESO 2022.",

year = "2022",

month = mar,

day = "1",

doi = "10.1051/0004-6361/202243082",

language = "English",

volume = "659",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Brandeker, A, Heng, K, Lendl, M, Patel, JA, Morris, BM, Broeg, C, Guterman, P, Beck, M, Maxted, PFL, Demangeon, O, Delrez, L, Demory, BO, Kitzmann, D, Santos, NC, Singh, V, Alibert, Y, Alonso, R, Anglada, G, Bárczy, T, Barrado y Navascues, D, Barros, SCC, Baumjohann, W, Beck, T, Benz, W, Billot, N, Bonfils, X, Bruno, G, Cabrera, J, Charnoz, S, Collier Cameron, A, Corral van Damme, C, Csizmadia, S, Davies, MB, Deleuil, M, Deline, A, Ehrenreich, D, Erikson, A, Farinato, J, Fortier, A, Fossati, L, Fridlund, M, Gandolfi, D, Gillon, M, Güdel, M, Hoyer, S, Isaak, KG, Kiss, L, Laskar, J, Lecavelier des Etangs, A, Lovis, C, Luntzer, A, Magrin, D, Nascimbeni, V, Olofsson, G, Ottensamer, R, Pagano, I, Pallé, E, Peter, G, Piotto, G, Pollacco, D, Queloz, D, Ragazzoni, R, Rando, N, Rauer, H, Ribas, I, Scandariato, G, Ségransan, D, Simon, AE, Smith, AMS, Sousa, SG, Steller, M, Szabó, GM, Thomas, N, Udry, S, van Grootel, V, Walton, N & Wolter, D 2022, 'CHEOPS geometric albedo of the hot Jupiter HD 209458 b', Astronomy and Astrophysics, vol. 659, L4. https://doi.org/10.1051/0004-6361/202243082

TY - JOUR

T1 - CHEOPS geometric albedo of the hot Jupiter HD 209458 b

AU - Brandeker, A.

AU - Heng, K.

AU - Lendl, M.

AU - Patel, J. A.

AU - Morris, B. M.

AU - Broeg, C.

AU - Guterman, P.

AU - Beck, M.

AU - Maxted, P. F.L.

AU - Demangeon, O.

AU - Delrez, L.

AU - Demory, B. O.

AU - Kitzmann, D.

AU - Santos, N. C.

AU - Singh, V.

AU - Alibert, Y.

AU - Alonso, R.

AU - Anglada, G.

AU - Bárczy, T.

AU - Barrado y Navascues, D.

AU - Barros, S. C.C.

AU - Baumjohann, W.

AU - Beck, T.

AU - Benz, W.

AU - Billot, N.

AU - Bonfils, X.

AU - Bruno, G.

AU - Cabrera, J.

AU - Charnoz, S.

AU - Collier Cameron, A.

AU - Corral van Damme, C.

AU - Csizmadia, Sz

AU - Davies, M. B.

AU - Deleuil, M.

AU - Deline, A.

AU - Ehrenreich, D.

AU - Erikson, A.

AU - Farinato, J.

AU - Fortier, A.

AU - Fossati, L.

AU - Fridlund, M.

AU - Gandolfi, D.

AU - Gillon, M.

AU - Güdel, M.

AU - Hoyer, S.

AU - Isaak, K. G.

AU - Kiss, L.

AU - Laskar, J.

AU - Lecavelier des Etangs, A.

AU - Lovis, C.

AU - Luntzer, A.

AU - Magrin, D.

AU - Nascimbeni, V.

AU - Olofsson, G.

AU - Ottensamer, R.

AU - Pagano, I.

AU - Pallé, E.

AU - Peter, G.

AU - Piotto, G.

AU - Pollacco, D.

AU - Queloz, D.

AU - Ragazzoni, R.

AU - Rando, N.

AU - Rauer, H.

AU - Ribas, I.

AU - Scandariato, G.

AU - Ségransan, D.

AU - Simon, A. E.

AU - Smith, A. M.S.

AU - Sousa, S. G.

AU - Steller, M.

AU - Szabó, G. M.

AU - Thomas, N.

AU - Udry, S.

AU - van Grootel, V.

AU - Walton, N.

AU - Wolter, D.

PY - 2022/3/1

Y1 - 2022/3/1

N2 - 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+3.2-3.3 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.

AB - 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+3.2-3.3 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.

KW - Planetary systems

KW - Planets

KW - Planets and satellites: Atmospheres

KW - Satellites: Individual: HD 209458 b

KW - Techniques: Photometric

U2 - 10.1051/0004-6361/202243082

DO - 10.1051/0004-6361/202243082

M3 - Article

AN - SCOPUS:85126114426

SN - 0004-6361

VL - 659

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L4

ER -

CHEOPS geometric albedo of the hot Jupiter HD 209458 b

Abstract

Keywords

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