CHEOPS geometric albedo of the hot Jupiter HD 209458 b

被引：29

作者：

Brandeker, A. ^{[1
]}

Heng, K. ^{[2
,3
]}

Lendl, M. ^{[4
]}

Patel, J. A. ^{[1
]}

Morris, B. M. ^{[2
]}

Broeg, C. ^{[2
,5
]}

Guterman, P. ^{[6
,7
]}

Beck, M. ^{[4
]}

Maxted, P. F. L. ^{[8
]}

Demangeon, O. ^{[9
,10
]}

Delrez, L. ^{[11
,12
]}

Demory, B-O ^{[2
]}

Kitzmann, D. ^{[2
]}

Santos, N. C. ^{[9
,10
]}

Singh, V ^{[13
]}

Alibert, Y. ^{[5
]}

Alonso, R. ^{[14
,15
]}

Anglada, G. ^{[16
,17
]}

Barczy, T. ^{[18
]}

Barrado y Navascues, D. ^{[19
]}

Barros, S. C. C. ^{[9
,10
]}

Baumjohann, W. ^{[20
]}

Beck, T. ^{[5
]}

Benz, W. ^{[2
,5
]}

Billot, N. ^{[4
]}

Bonfils, X. ^{[21
]}

Bruno, G. ^{[5
]}

Cabrera, J. ^{[22
]}

Charnoz, S. ^{[23
]}

Collier Cameron, A. ^{[24
]}

van Damme, C. Corral ^{[25
]}

Csizmadia, Sz ^{[22
]}

Davies, M. B. ^{[26
]}

Deleuil, M. ^{[6
]}

Deline, A. ^{[4
]}

Ehrenreich, D. ^{[4
]}

Erikson, A. ^{[22
]}

Farinato, J. ^{[13
]}

Fortier, A. ^{[2
,5
]}

Fossati, L. ^{[20
]}

Fridlund, M. ^{[27
,28
]}

Gandolfi, D. ^{[29
]}

Gillon, M. ^{[11
]}

Guedel, M. ^{[30
]}

Hoyer, S. ^{[6
]}

Isaak, K. G. ^{[31
]}

Kiss, L. ^{[32
,33
]}

Laskar, J. ^{[34
]}

Lecavelier des Etangs, A. ^{[35
]}

Lovis, C. ^{[4
]}

机构：

[1] Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, S-10691 Stockholm, Sweden

[2] Ctr Space & Habitabil, Gesell Str 6, CH-3012 Bern, Switzerland

[3] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[4] Univ Geneva, Observ Astron, Chemin Pegasi 51, Versoix, Switzerland

[5] Univ Bern, Phys Inst, Gesell Str 6, CH-3012 Bern, Switzerland

[6] Aix Marseille Univ, LAM, CNES, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille, France

[7] Div Tech INSU, BP 330, F-83507 La Seyne Sur Mer, France

[8] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

[9] Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Porto, Portugal

[10] Univ Porto, Fac Ciencias, Dept Fis & Astron, Rua Campo Alegre, P-4169007 Porto, Portugal

[11] Univ Liege, Astrobiol Res Unit, Allee 6 Aout 19C, B-4000 Liege, Belgium

[12] Univ Liege, Space Sci Technol & Astrophys Res STAR, Allee 6 Aout 19C, B-4000 Liege, Belgium

[13] Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy

[14] Inst Astrofis Canarias, Tenerife 38200, Spain

[15] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain

[16] CSIC, Inst Ciencies Espai ICE, Campus UAB,Can Magrans S-N, Bellaterra 08193, Spain

[17] Inst Estudis Espacials Catalunya IEEC, Barcelona 08034, Spain

[18] Admatis, 5 Kando Kalman St, H-3534 Miskolc, Hungary

[19] Ctr Astrobiol CSIC INTA, Dept Astrofis, ESAC Campus, Madrid 28692, Spain

[20] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria

[21] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France

[22] German Aerosp Ctr DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany

[23] Univ Paris, CNRS, Inst Phys Globe Paris, F-75005 Paris, France

[24] Univ St Andrews, SUPA Sch Phys & Astron, Ctr Exoplanet Sci, St Andrews KY16 9SS, Fife, Scotland

[25] European Space Agcy, Estec, NL-2201 AZ Noordwijk, Netherlands

[26] Lund Univ, Ctr Math Sci, Box 118, S-22100 Lund, Sweden

[27] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[28] Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden

[29] Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy

[30] Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria

[31] Europea Space Res & Technol Ctr ESTEC, Sci & Operat Dept Sci Div SCI SC, European Space Agcy ESA, Directorate Sci, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[32] Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary

[33] Eotvos Lorand Univ, Inst Phys, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary

[34] Sorbonne Univ, PSL Univ, Observ Paris, IMCCE,UMR8028 CNRS, 77 Av Denfert Rochereau, F-75014 Paris, France

[35] Univ Paris 06, Inst Astrophys Paris, UMR7095 CNRS, 98Bis Blvd Arago, F-75014 Paris, France

[36] Univ Vienna, Dept Astrophys, Tuerkenschanzstr 17, A-1180 Vienna, Austria

[37] Osserv Astrofis Catania, INAF, Via S Sofia 78, I-95123 Catania, Italy

[38] German Aerosp Ctr DLR, Inst Opt Sensor Syst, Rutherfordstr 2, D-12489 Berlin, Germany

[39] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy

[40] Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

[41] Swiss Fed Inst Technol, Dept Phys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[42] Tech Univ Berlin, Ctr Astron & Astrophys, Hardenberstr 36, D-10623 Berlin, Germany

[43] Free Univ Berlin, Inst Geol Wissensch, D-12249 Berlin, Germany

[44] Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre Hu 112, H-9700 Szombathely, Hungary

[45] MTA ELTE Exoplanet Res Grp, Szent Imre Hu 112, H-9700 Szombathely, Hungary

[46] MTA ELTE Lendulet Momentum Milky Way Res Grp, Szombathely, Hungary

[47] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 659卷

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

techniques: photometric; planetary systems; planets and satellites: atmospheres; planets and satellites: individual: HD 209458 b; TRANSMISSION SPECTRA; PHASE CURVES; ATMOSPHERE; ORBIT; SPECTROSCOPY; TEMPERATURES; PHOTOMETRY; SODIUM;

D O I：

10.1051/0004-6361/202243082

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 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 bandpassintegrated 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.

引用

页数：8

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