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Journal Articles Astronomy and Astrophysics - A&A Year : 2022

The stable climate of KELT-9b,★

K. Jones
  • Function : Author
B. M. Morris
  • Function : Author
B. -O. Demory
  • Function : Author
K. Heng
  • Function : Author
M. J. Hooton
  • Function : Author
N. Billot
  • Function : Author
D. Ehrenreich
  • Function : Author
A. E. Simon
  • Function : Author
M. Lendl
  • Function : Author
O. D. S. Demangeon
  • Function : Author
S. G. Sousa
  • Function : Author
A. Bonfanti
  • Function : Author
T. G. Wilson
  • Function : Author
S. Salmon
  • Function : Author
Sz. Csizmadia
  • Function : Author
H. Parviainen
  • Function : Author
G. Bruno
  • Function : Author
Y. Alibert
  • Function : Author
R. Alonso
  • Function : Author
G. Anglada
  • Function : Author
T. Bárczy
  • Function : Author
D. Barrado
  • Function : Author
S. C. C. Barros
  • Function : Author
W. Baumjohann
  • Function : Author
M. Beck
  • Function : Author
T. Beck
  • Function : Author
W. Benz
  • Function : Author
A. Brandeker
  • Function : Author
C. Broeg
  • Function : Author
J. Cabrera
  • Function : Author
A. Collier Cameron
  • Function : Author
M. B. Davies
  • Function : Author
A. Deline
  • Function : Author
L. Delrez
  • Function : Author
A. Erikson
  • Function : Author
A. Fortier
  • Function : Author
L. Fossati
  • Function : Author
M. Fridlund
  • Function : Author
D. Gandolfi
  • Function : Author
M. Gillon
  • Function : Author
M. Güdel
  • Function : Author
K. G. Isaak
  • Function : Author
L. L. Kiss
  • Function : Author
C. Lovis
  • Function : Author
D. Magrin
  • Function : Author
P. F. L. Maxted
  • Function : Author
V. Nascimbeni
  • Function : Author
G. Olofsson
  • Function : Author
R. Ottensamer
  • Function : Author
I. Pagano
  • Function : Author
E. Pallé
  • Function : Author
G. Peter
  • Function : Author
G. Piotto
  • Function : Author
D. Pollacco
  • Function : Author
D. Queloz
  • Function : Author
R. Ragazzoni
  • Function : Author
N. Rando
  • Function : Author
F. Ratti
  • Function : Author
H. Rauer
  • Function : Author
C. Reimers
  • Function : Author
I. Ribas
  • Function : Author
N. C. Santos
  • Function : Author
G. Scandariato
  • Function : Author
D. Ségransan
  • Function : Author
A. M. S. Smith
  • Function : Author
M. Steller
  • Function : Author
Gy. M. Szabó
  • Function : Author
N. Thomas
  • Function : Author
S. Udry
  • Function : Author
V. van Grootel
  • Function : Author
I. Walter
  • Function : Author
N. A. Walton
  • Function : Author
W. Wang Jungo
  • Function : Author

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 ~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%

The photometric time series data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/666/A118

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Dates and versions

insu-03839239 , version 1 (04-11-2022)

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K. Jones, B. M. Morris, B. -O. Demory, K. Heng, M. J. Hooton, et al.. The stable climate of KELT-9b,★. Astronomy and Astrophysics - A&A, 2022, 666, ⟨10.1051/0004-6361/202243823⟩. ⟨insu-03839239⟩
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