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Modelling the local and global cloud formation on HD 189733b

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Helling_2015_A_A_Modelling.pdf (19.28Mb)
Date
08/2015
Author
Lee, Graham Kim Huat
Helling, Christiane
Dobbs-Dixon, I.
Juncher, D.
Funder
European Research Council
Grant ID
257431 257431
Keywords
Planets and satellites: individual: HD 189733b
Planets and satellites: atmospheres
Methods: numerical
QC Physics
NDAS
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Abstract
Context. Observations suggest that exoplanets such as HD 189733b form clouds in their atmospheres which have a strong feedback onto their thermodynamical and chemical structure, and overall appearance. Aims. Inspired by mineral cloud modelling efforts for brown dwarf atmospheres, we present the first spatially varying kinetic cloud model structures for HD 189733b. Methods. We apply a 2-model approach using results from a 3D global radiation-hydrodynamic simulation of the atmosphere as input for a detailed, kinetic cloud formation model. Sampling the 3D global atmosphere structure with 1D trajectories allows us to model the spatially varying cloud structure on HD 189733b. The resulting cloud properties enable the calculation of the scattering and absorption properties of the clouds. Results. We present local and global cloud structure and property maps for HD 189733b. The calculated cloud properties show variations in composition, size and number density of cloud particles which are strongest between the dayside and nightside. Cloud particles are mainly composed of a mix of materials with silicates being the main component. Cloud properties, and hence the local gas composition, change dramatically where temperature inversions occur locally. The cloud opacity is dominated by absorption in the upper atmosphere and scattering at higher pressures in the model. The calculated 8 μm single scattering albedo of the cloud particles are consistent with Spitzer bright regions. The cloud particles scattering properties suggest that they would sparkle/reflect a midnight blue colour at optical wavelengths.
Citation
Lee , G K H , Helling , C , Dobbs-Dixon , I & Juncher , D 2015 , ' Modelling the local and global cloud formation on HD 189733b ' , Astronomy & Astrophysics , vol. 580 , A12 . https://doi.org/10.1051/0004-6361/201525982
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201525982
ISSN
0004-6361
Type
Journal article
Rights
© ESO, 2015. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Description
G.L. and Ch.H. highlight the financial support of the European community under the FP7 ERC starting grant 257431.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/7194

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