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1.	Jones, K., et al. (author) The stable climate of KELT-9b 2022 In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 666 Journal article (peer-reviewed)abstract Even among the most irradiated gas giants, so-called ultra-hot Jupiters, KELT-9b stands out as the hottest planet thus far discovered with a dayside temperature of over 4500 K. At these extreme irradiation levels, we expect an increase in heat redistribution efficiency and a low Bond albedo owed to an extended atmosphere with molecular hydrogen dissociation occurring on the planetary dayside. We present new photometric observations of the KELT-9 system throughout 4 full orbits and 9 separate occultations obtained by the 30 cm space telescope CHEOPS. The CHEOPS bandpass, located at optical wavelengths, captures the peak of the thermal emission spectrum of KELT-9b. In this work we simultaneously analyse CHEOPS phase curves along with public phase curves from TESS and Spitzer to infer joint constraints on the phase curve variation, gravity-darkened transits, and occultation depth in three bandpasses, as well as derive 2D temperature maps of the atmosphere at three different depths. We find a day-night heat redistribution efficiency of similar to 0.3 which confirms expectations of enhanced energy transfer to the planetary nightside due to dissociation and recombination of molecular hydrogen. We also calculate a Bond albedo consistent with zero. We find no evidence of variability of the brightness temperature of the planet, excluding variability greater than 1% (1 sigma).

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Davies, M. B. (2); Bruno, G. (1); Thomas, N (1); Beck, M (1); Olofsson, Göran, 194 ... (1); Brandeker, Alexis (1); show more...; Walton, N. A. (1); Salmon, S (1); Piotto, G. (1); Jones, K (1); Barros, S.C.C. (1); Lendl, M. (1); Fortier, A. (1); Demory, B.O. (1); Sousa, S.G. (1); Wilson, T.G. (1); Deline, A. (1); Bonfanti, A. (1); Hooton, M.J. (1); Smith, A. M.S. (1); Alibert, Y. (1); Alonso, R. (1); Bárczy, T. (1); Baumjohann, W. (1); Beck, T. (1); Benz, W. (1); Billot, N. (1); Bonfils, X. (1); Broeg, C. (1); Charnoz, S. (1); Deleuil, M. (1); Delrez, L. (1); Ehrenreich, D. (1); Fossati, L. (1); Fridlund, Malcolm, 1 ... (1); Gandolfi, D. (1); Gudel, M. (1); Hoyer, S. (1); Kiss, L. L. (1); Laskar, J. (1); Magrin, D. (1); Ottensamer, R. (1); Pagano, I. (1); Peter, G. (1); Queloz, D. (1); Rando, N. (1); Rauer, H. (1); Ribas, I. (1); Santos, N. C. (1); Segransan, D. (1); show less...

University: Stockholm University (1); Lund University (1); Chalmers University of Technology (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2022 (1)

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