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We present a new two-dimensional, bin-scheme microphysical model of cloud formation in the atmospheres of hot Jupiters that includes the effects of longitudinal gas and cloud transport. We predict cloud particle size distributions as a…

Earth and Planetary Astrophysics · Physics 2024-04-16 Diana Powell , Xi Zhang

We aim to understand cloud formation in substellar objects. We combined the non-equilibrium, stationary cloud model of Helling, Woitke & Thi (2008; seed formation, growth, evaporation, gravitational settling, element conservation) with the…

Astrophysics · Physics 2009-11-13 Christiane Helling , Matthias Dehn , Peter Woitke , Peter H. Hauschildt

A number of transiting exoplanets have featureless transmission spectra that might suggest the presence of clouds at high altitudes. A realistic cloud model is necessary to understand the atmospheric conditions under which such…

Earth and Planetary Astrophysics · Physics 2017-02-08 Kazumasa Ohno , Satoshi Okuzumi

The precipitation of cloud particles in brown dwarf and exoplanet atmospheres establishes an ongoing downward flux of condensable elements. To understand the efficiency of cloud formation, it is therefore crucial to quantify the…

Earth and Planetary Astrophysics · Physics 2020-02-05 Peter Woitke , Christiane Helling , Ophelia Gunn

With the operation of JWST, atmospheric characterization has now extended to low-mass exoplanets. In compact multiplanetary systems, secular spin-orbital resonance may preserve high obliquities and asynchronous rotation even for…

Earth and Planetary Astrophysics · Physics 2026-01-27 Yanhong Lai , Xianyu Tan , Yubo Su

Ultra-hot Jupiters are the hottest exoplanets discovered so far. Observations begin to provide insight into the composition of their extended atmospheres and their chemical day/night asymmetries. Both are strongly affected by cloud…

Earth and Planetary Astrophysics · Physics 2021-05-12 Ch. Helling , D. Lewis , D. Samra , L. Carone , V. Graham , O. Herbort , K. L. Chubb , M. Min , R. Waters , V. Parmentier , N. Mayne

State-of-the-art JWST observations are unveiling unprecedented views into the atmospheres of substellar objects in the infrared, further highlighting the importance of clouds. Current forward models struggle to fit the silicate clouds…

Atmospheric characterisation of temperate sub-Neptunes is the new frontier of exoplanetary science with recent JWST observations of possible Hycean world K2-18b. Accurate modelling of atmospheric processes is essential to interpreting…

Earth and Planetary Astrophysics · Physics 2025-02-19 Edouard F. L. Barrier , Nikku Madhusudhan

Young exoplanets provide a critical link between understanding planet formation and atmospheric evolution. Direct imaging spectroscopy allows us to infer the properties of young, wide orbit, giant planets with high signal-to-noise. This…

With the development of ever-improving telescopes capable of observing exoplanet atmospheres in greater detail and number, there is a growing demand for enhanced 3D climate models to support and help interpret observational data from space…

Earth and Planetary Astrophysics · Physics 2025-08-15 Alexander Plaschzug , Amit Reza , Ludmila Carone , Sebastian Gernjak , Christiane Helling

The chemical inventory of hot Jupiter (HJ) exoplanets atmospheres continue to be observed by various ground and space based instruments in increasing detail and precision. It is expected that some HJs will exhibit strong non-equilibrium…

Earth and Planetary Astrophysics · Physics 2023-04-12 Elspeth K. H. Lee , Shang-Min Tsai , Mark Hammond , Xianyu Tan

The hot-Jupiter HAT-P-2b has become a prime target for Spitzer Space Telescope observations aimed at understanding the atmospheric response of exoplanets on highly eccentric orbits. Here we present a suite of three-dimensional atmospheric…

Earth and Planetary Astrophysics · Physics 2015-06-22 Nikole K. Lewis , Adam P. Showman , Jonathan J. Fortney , Heather A. Knutson , Mark S. Marley

Exoplanet atmosphere characterisation has become an important tool in understanding exoplanet formation, evolution. However, clouds remain a key challenge for characterisation: upcoming space telescopes (e.g. JWST, ARIEL) and ground-based…

Earth and Planetary Astrophysics · Physics 2020-07-22 Dominic Samra , Christiane Helling , Michiel Min

Modeling the atmospheres of exoplanets is fundamental to understanding their atmospheric physics and chemical processes. While one-dimensional (1D) atmospheric models with 1D radiative transfer (RT) have been widely used, advances in…

Earth and Planetary Astrophysics · Physics 2025-12-01 Rahul Arora , Liton Majumdar

Close-in warm Jupiters orbiting M dwarf stars are expected to exhibit diverse atmospheric chemistry, with clouds playing a key role in shaping their albedo, heat distribution, and spectral properties. We study WASP-80b, a warm Jupiter…

Cloud computing offers an opportunity to run compute-resource intensive climate models at scale by parallelising model runs such that datasets useful to the exoplanet community can be produced efficiently. To better understand the…

Atmospheric temperature and planetary gravity are thought to be the main parameters affecting cloud formation in giant exoplanet atmospheres. Recent attempts to understand cloud formation have explored wide regions of the equilibrium…

Over the last decade, precise exoplanet transmission spectroscopy has revealed the atmospheres of dozens of exoplanets, driven largely by observatories like the Hubble Space Telescope. One major discovery has been the ubiquity of…

Cloud microphysical parameterizations in atmospheric models describe the formation and evolution of clouds and precipitation, a central weather and climate process. Cloud-associated latent heating is a primary driver of large and…

WASP-96b is a hot Saturn exoplanet, with an equilibrium temperature well within the regime of thermodynamically expected extensive cloud formation. Prior observations with Hubble/WFC3, Spitzer/IRAC, and VLT/FORS2 have been combined into a…

Earth and Planetary Astrophysics · Physics 2023-02-01 Dominic Samra , Christiane Helling , Katy Chubb , Michiel Min , Ludmila Carone , Aaron Schneider