271 citations · 2.7k across the 48 of their papers we have counts for
50 papers
Probing Exoplanetary Chemistry with Ariel: Scientific Priorities and Observational Strategies
Olivia Venot, Yamila Miguel, Robin Baeyens +30
Over the past two decades, increasingly precise observations have revealed that exoplanet atmospheres are chemically diverse and often far from equilibrium, with processes such as…
Helium escape in context: Comparative signatures of four close-in exoplanets
Anna Ruth Taylor, Tommi T. Koskinen, Chenliang Huang +2
Observations of escaping atmospheres on close-in exoplanets show a wide range in the strength and morphology of He I 10830 A and H I absorption. Scaling relations attempt to link t…
Using SOFIA's EXES to search for CH and CN in Titan's atmosphere
Zachary C. McQueen, Conor A. Nixon, Curtis de Witt +7
In Titan's atmosphere, the chemistry of small hydrocarbons and nitriles represent an important link from molecular species to the ubiquitous organic haze that gives Titan its chara…
Hydrocarbon Hazes on Temperate sub-Neptune K2-18b supported by data from the James Webb Space Telescope
Ruohan Liu, Panayotis Lavvas, Giovanna Tinetti +3
K2-18b, a sub-Neptune orbiting in the habitable zone of an M dwarf, has attracted significant interest following observations with the Hubble Space Telescope (HST) and, more recent…
On the synergetic use of Ariel and JWST for exoplanet atmospheric science
Quentin Changeat, Pierre-Olivier Lagage, Giovanna Tinetti +27
This paper explores the potential for strategic synergies between the JWST and the Ariel telescopes, two flagship observatories poised to revolutionise the study of exoplanet atmos…
A Multi-Species Atmospheric Escape Model with Excited Hydrogen and Helium: Application to HD209458b
Anna Ruth Taylor, Tommi T. Koskinen, Luca Argenti +4
Atmospheric escape shapes exoplanet evolution and star-planet interactions, with He I 10830 Å absorption serving as a key tracer of mass loss in hot gas giants. However, transit de…
Atmospheric characterisation of GJ1214b from transit and eclipse observations
Panayotis Lavvas, Sophia Paraskevaidou, Anthony Arfaux
The atmospheric characterisation of GJ1214 b has so far remained uncertain due to the observed flatness of the transit spectra of this planet that is typically attributed to the pr…
Coupling haze and cloud microphysics in WASP-39b's atmosphere based on JWST observations
Anthony Arfaux, Panayotis Lavvas
We present a study on the coupling of haze and clouds in the atmosphere of WASP-39b. We developed a cloud microphysics model simulating the formation of Na2S and MgSiO3 condensates…
CUTE reveals escaping metals in the upper atmosphere of the ultra-hot Jupiter WASP-189b
A. G. Sreejith, Kevin France, Luca Fossati +12
Ultraviolet observations of Ultra-hot Jupiters (UHJs), exoplanets with temperatures over 2000\,K, provide us with an opportunity to investigate if and how atmospheric escape shapes…
Photochemical hazes dramatically alter temperature structure and atmospheric circulation in 3D simulations of hot Jupiters
Maria E. Steinrueck, Tommi Koskinen, Panayotis Lavvas +5
Photochemical hazes are expected to form in hot Jupiter atmospheres and may explain the strong scattering slopes and muted spectral features observed in the transmission spectra of…
A hydrodynamic study of the escape of metal species and excited hydrogen from the atmosphere of the hot Jupiter WASP-121b
Chenliang Huang, Tommi Koskinen, Panayotis Lavvas +1
In the near-UV and optical transmission spectrum of the hot Jupiter WASP-121b, recent observations have detected strong absorption features of Mg, Fe, Ca, and H, extending outsi…
A physically derived eddy parameterization for giant planet atmospheres with application on hot-Jupiter atmospheres
Anthony Arfaux, Panayotis Lavvas
We present a parameterization for the eddy diffusion profile of gas giant exoplanets based on physical phenomena and we explore how the parameterized eddy profile impacts the chemi…
Signatures of Strong Magnetization and Metal-Poor Atmosphere for a Neptune-Size Exoplanet
Lotfi Ben-Jaffel, Gilda E. Ballester, Antonio García Muñoz +10
The magnetosphere of an exoplanet has yet to be unambiguously detected. Investigations of star-planet interaction and neutral atomic hydrogen absorption during transit to detect ma…
A large range of haziness conditions in hot-Jupiter atmospheres
Anthony Arfaux, Panayotis Lavvas
We present a study of photochemical hazes of exoplanet atmospheres based on a self-consistent model including haze microphysics, disequilibrium chemistry, and radiative feedbacks.…
UV Absorption by Silicate Cloud Precursors in Ultra-hot Jupiter WASP-178b
Joshua D. Lothringer, David K. Sing, Zafar Rustamkulov +6
Aerosols have been found to be nearly ubiquitous in substellar atmospheres. The precise temperature at which these aerosols begin to form in exoplanets has yet to be observationall…
Mass loss by atmospheric escape from extremely close-in planets
Tommi Koskinen, Panayotis Lavvas, Chenliang Huang +3
We explore atmospheric escape from close-in exoplanets with the highest mass loss rates. First, we locate the transition from stellar X-ray and UV-driven escape to rapid Roche lobe…
Science goals and new mission concepts for future exploration of Titan's atmosphere geology and habitability: Titan POlar Scout/orbitEr and In situ lake lander and DrONe explorer (POSEIDON)
Sébastien Rodriguez, Sandrine Vinatier, Daniel Cordier +61
In response to ESA Voyage 2050 announcement of opportunity, we propose an ambitious L-class mission to explore one of the most exciting bodies in the Solar System, Saturn largest m…
Energy deposition in Saturn's equatorial upper atmosphere
J. M. Chadney, T. T. Koskinen, X. Hu +6
We construct Saturn equatorial neutral temperature and density profiles of H, H, He, and CH, between 10 and 1 bar using measurements from Cassini's Ion Neutral Mass…
Pluto's atmosphere observations with ALMA: spatially-resolved maps of CO and HCN emission and first detection of HNC
E. Lellouch, B. Butler, R. Moreno +6
Following the detection of CO and HCN in Pluto's atmosphere, we report on new ALMA observations of Pluto with two main goals: (i) obtaining spatially-resolved measurements (~0.06''…
The near-UV transit of HD 189733b with the XMM-Newton Optical Monitor
George W. King, Lía Corrales, Peter J. Wheatley +6
We present analysis of XMM-Newton Optical Monitor observations in the near-ultraviolet of HD 189733, covering twenty primary transits of its hot Jupiter planet. The transit is clea…
HST PanCET program: Non-detection of atmospheric escape in the warm Saturn-sized planet WASP-29 b
L. A. dos Santos, V. Bourrier, D. Ehrenreich +10
(Abridged) Short-period gas giant exoplanets are susceptible to intense atmospheric escape due to their large scale heights and strong high-energy irradiation. This process is thou…
The Hubble PanCET program: Long-term chromospheric evolution and flaring activity of the M dwarf host GJ 3470
V. Bourrier, L. A. dos Santos, J. Sanz-Forcada +9
Neptune-size exoplanets seem particularly sensitive to atmospheric evaporation, making it essential to characterize the stellar high-energy radiation that drives this mechanism. Th…
Impact of photochemical hazes and gases on exoplanet atmospheric thermal structure
Panayotis Lavvas, Anthony Arfaux
We investigate the impact of photochemical hazes and disequilibrium gases on the thermal structure of hot-Jupiters, using a detailed 1-D radiative-convective model. We find that th…
3D simulations of photochemical hazes in the atmosphere of hot Jupiter HD 189733b
Maria E Steinrueck, Adam P. Showman, Panayotis Lavvas +3
Photochemical hazes have been suggested as candidate for the high-altitude aerosols observed in the transmission spectra of many hot Jupiters. We present 3D simulations of the hot…