Publications (25)
TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Motivations and protocol version 1.0
Thomas J. Fauchez, Martin Turbet, Eric T. Wolf +10
Upcoming telescopes such as the James Webb Space Telescope (JWST), or the Extremely Large Telescope (ELTs), may soon be able to characterize, through transmission, emission or refl…
3D modelling of the early Martian Climate under a denser CO2 atmosphere: Temperatures and CO2 ice clouds
Francois Forget, Robin Wordsworth, Ehouarn Millour +5
On the basis of geological evidence, it is often stated that the early martian climate was warm enough for liquid water to flow on the surface thanks to the greenhouse effect of a…
Possible climates on terrestrial exoplanets
Francois Forget, Jeremy Leconte
What kind of environment may exist on terrestrial planets around other stars? In spite of the lack of direct observations, it may not be premature to speculate on exoplanetary clim…
The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
Ignasi Ribas, Emeline Bolmont, Franck Selsis +9
Proxima b is a planet with a minimum mass of 1.3 MEarth orbiting within the habitable zone (HZ) of Proxima Centauri, a very low-mass, active star and the Sun's closest neighbor. He…
Seasonal Variability of the Daytime and Nighttime Atmospheric Turbulence Experienced by InSight on Mars
Audrey Chatain, Aymeric Spiga, Don Banfield +2
The InSight mission, featuring continuous high-frequency high-sensitivity pressure measurements, is in ideal position to study the active atmospheric turbulence of Mars. Data acqui…
CO2 condensation is a serious limit to the deglaciation of Earth-like planets
Martin Turbet, Francois Forget, Jeremy Leconte +2
It is widely believed that the carbonate-silicate cycle is the main agent to trigger deglaciations by CO greenhouse warming on Earth and on Earth-like planets when they get in…
Simulations of Water Vapor and Clouds on Rapidly Rotating and Tidally Locked Planets: a 3D Model Intercomparison
Jun Yang, Jeremy Leconte, Eric T. Wolf +4
Robustly modeling the inner edge of the habitable zone is essential for determining the most promising potentially habitable exoplanets for atmospheric characterization. Global cli…
The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Part II: Moist Cases -- The Two Waterworlds
Denis E. Sergeev, Thomas J. Fauchez, Martin Turbet +11
To identify promising exoplanets for atmospheric characterization and to make the best use of observational data, a thorough understanding of their atmospheres is needed. 3D genera…
Differences in water vapor radiative transfer among 1D models can significantly affect the inner edge of the habitable zone
Jun Yang, Jeremy Leconte, Eric T. Wolf +8
An accurate estimate of the inner edge of the habitable zone is critical for determining which exoplanets are potentially habitable and for designing future telescopes to observe t…
Modelling climate diversity, tidal dynamics and the fate of volatiles on TRAPPIST-1 planets
Martin Turbet, Emeline Bolmont, Jeremy Leconte +6
TRAPPIST-1 planets are invaluable for the study of comparative planetary science outside our Solar System and possibly habitability. First, we derive from N-body simulations possib…
The EChO science case
Giovanna Tinetti, Pierre Drossart, Paul Eccleston +347
The discovery of almost 2000 exoplanets has revealed an unexpectedly diverse planet population. Observations to date have shown that our Solar System is certainly not representativ…
The paradoxes of the Late Hesperian Mars ocean
Martin Turbet, Francois Forget
The long-standing debate on the existence of ancient oceans on Mars has been recently revived by evidence for tsunami resurfacing events that date from the Late Hesperian geologica…
Comparison of "warm and wet" and "cold and icy" scenarios for early Mars in a 3D climate model
Robin D. Wordsworth, Laura Kerber, Raymond T. Pierrehumbert +2
We use a 3D general circulation model to compare the primitive Martian hydrological cycle in "warm and wet" and "cold and icy" scenarios. In the warm and wet scenario, an anomalous…
The habitability of Proxima Centauri b II. Possible climates and Observability
Martin Turbet, Jeremy Leconte, Franck Selsis +5
Radial velocity monitoring has found the signature of a ~M planet located within the Habitable Zone (HZ) of Proxima Centauri \citep{Anglada16}. Despite a h…
3D climate modeling of close-in land planets: Circulation patterns, climate moist bistability and habitability
Jérémy Leconte, Francois Forget, Benjamin Charnay +3
The inner edge of the classical habitable zone is often defined by the critical flux needed to trigger the runaway greenhouse instability. This 1D notion of a critical flux, howeve…
Sublimation of the Martian CO2 Seasonal South Polar Cap
Frederic Schmidt, Bernard Schmitt, Sylvain Doute +6
The polar condensation/sublimation of CO2, that involve about one fourth of the atmosphere mass, is the major Martian climatic cycle. Early observations in visible and thermal infr…
Water Condensation Zones around Main Sequence Stars
Martin Turbet, Thomas J. Fauchez, Jeremy Leconte +10
Understanding the set of conditions that allow rocky planets to have liquid water on their surface -- in the form of lakes, seas or oceans -- is a major scientific step to determin…
Far infrared measurements of absorptions by CH4+CO2 and H2+CO2 mixtures and implications for greenhouse warming on early Mars
Martin Turbet, Ha Tran, Olivier Pirali +3
We present an experimental study of the absorption, between 40 and 640 cm, by CO, CH and H gases as well as by H+CO and CH+CO mixtures at room te…
TRAPPIST Habitable Atmosphere Intercomparison (THAI) workshop report
Thomas J. Fauchez, Martin Turbet, Denis E. Sergeev +31
The era of atmospheric characterization of terrestrial exoplanets is just around the corner. Modeling prior to observations is crucial in order to predict the observational challen…
Martian cloud climatology and life cycle extracted from Mars Express OMEGA spectral images
André Szantai, Joachim Audouard, Francois Forget +7
We extracted a Martian water-ice cloud climatology from OMEGA data covering 7 Martian years (MY 26-32). We derived two products, the Reversed Ice Cloud Index (ICIR) and the Percent…
On the Possibility of Melting Water Ice during the Recent Past of Mars: Application to the Formation of Gullies
Lucas Lange, Francois Forget
The formation of gullies on Mars has often been attributed to the melting of (sub)surface water ice. However, melting-based hypotheses generally overlook key processes: (1) sublima…
An Extremely Elongated Cloud over Arsia Mons Volcano on Mars: II. Mesoscale modeling
Jorge From, :, Jorge Hernández-Bernal +5
In a previous work (Hernández-Bernal et al. 2021) we performed an observational analysis of the Arsia Mons Elongated Cloud (AMEC), which stands out due to its impressive size and…
On the probability of habitable planets
Francois Forget
In the past 15 years, astronomers have revealed that a significant fraction of the stars should harbor planets and that it is likely that terrestrial planets are abundant in our ga…
The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Part III: Simulated Observables -- The return of the spectrum
Thomas J. Fauchez, Geronimo L. Villanueva, Denis E. Sergeev +11
The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI) is a community project that aims to quantify how dfferences in general circulation models (GCMs) could impact the climate…
Revealing the Mysteries of Venus: The DAVINCI Mission
James B. Garvin, Stephanie A. Getty, Giada N. Arney +36
The Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging (DAVINCI) mission described herein has been selected for flight to Venus as part of the NASA Discover…