CHEOPS geometric albedo of the hot Jupiter HD 209458 b
- 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.
- Barrado y Navascues, D.
- Barros, S. C. C.
- Baumjohann, W.
- Beck, T.
- Benz, W.
- Billot, N.
- Bonfils, X.
- Bruno, G.
- Cabrera, J.
- Charnoz, S.
- Collier Cameron, A.
- Corral van Damme, C.
- Csizmadia, Sz.
- Davies, M. B.
- 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, K. G.
- 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, A. E.
- Smith, A. M. S.
- Sousa, S. G.
- Steller, M.
- Szabó, G. M.
- Thomas, N.
- Udry, S.
- van Grootel, V.
- Walton, N.
- Wolter, D.
DOIAbstract
International audienceWe 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 Raylei...
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