T. Cavalié
A5079689961- Astro and Planetary Science
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- Astronomy and Astrophysical Research
- Advanced Chemical Physics Studies
- Scientific Research and Discoveries
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Molecular Spectroscopy and Structure
- Superconducting and THz Device Technology
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Atmospheric and Environmental Gas Dynamics
- Astronomical Observations and Instrumentation
- Geological and Geochemical Analysis
- Mass Spectrometry Techniques and Applications
Université de Bordeaux
2011-2024
Laboratoire d'Astrophysique de Bordeaux
2009-2024
Université Paris Cité
2015-2024
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2015-2024
Observatoire de Paris
2017-2024
Centre National de la Recherche Scientifique
2015-2024
Sorbonne Paris Cité
2015-2024
Sorbonne Université
2015-2024
Délégation Paris 7
2015-2024
Université Paris Sciences et Lettres
2015-2024
Aims. In this paper the calibration and in-orbit performance of Heterodyne Instrument for Far-Infrared (HIFI) is described.
While small Neptune-like planets are among the most abundant exoplanets, our understanding of their atmospheric structure and dynamics remains sparse. In particular, many unknowns remain regarding way moist convection works in these atmospheres, where condensable species heavier than non-condensable background gas. it has been predicted that could cease above some threshold abundance species, this prediction is based on simple linear analysis relies strong assumptions saturation atmosphere....
Cryovolcanic activity near the south pole of Saturn's moon Enceladus produces plumes H2O-dominated gases and ice particles, which escape populate a torus-shaped cloud. Using submillimeter spectroscopy with Herschel, we report direct detection water vapor torus in four rotational lines at 557, 987, 1113, 1670 GHz, probe its physical conditions structure. We determine line-of-sight H2O column densities ~4 × 1013 cm-2 equatorial plane, ~50 000 km vertical scale height. The appears to be...
We report on an initial analysis of Herschel/HIFI observations hydrogen chloride (HCl), peroxide (H_2O_2), and molecular oxygen (O_2) in the Martian atmosphere performed 13 16 April 2010 (L_s ~ 77{\deg}). derived a constant volume mixing ratio 1400 +/- 120 ppm for O_2 determined upper limits 200 ppt HCl 2 ppb H_2O_2. Radiative transfer model calculations indicate that vertical profile may not be constant. Photochemical models determine lowest values H_2O_2 to around L_s 75{\deg} but...
We report on the initial analysis of a <i>Herschel<i/>-PACS full range spectrum Neptune, covering 51–220 <i>μ<i/>m with mean resolving power ~3000, and complemented by dedicated observation CH<sub>4<sub/> at 120 <i>μ<i/>m. Numerous spectral features due to HD (R(0) R(1)), H<sub>2<sub/>O, CH<sub>4<sub/>, CO are present, but so far no new species have been found. Our results indicate that (i) Neptune's thermal profile is warmer ~3 K than inferred from <i>Voyager<i/> radio-occultation; (ii) D/H...
Context. Carbon monoxide (CO) has been detected in all Giant Planets and its origin is both internal external Jupiter Neptune. Despite first detection Uranus a decade ago, the magnitude of sources remains unconstrained. Aims. We targeted CO lines submillimeter range to constrain origin. Methods. recorded disk-averaged spectra with very high spectral resolution at frequencies rotational 2011-2012. used empirical diffusion models atmosphere CO. also thermochemical model troposphere derive an...
Context. Several chemical networks have been developed to study warm (exo)planetary atmospheres. The kinetics of the reactions related methanol chemistry included in these schemes questioned. Aims. goal this paper is update for such based on recent publications combustion literature. We also aim consequences atmospheric compositions atmospheres and brown dwarfs. Methods. performed an extensive review experimental studies revisited sub-mechanism describing a scheme published 2012. updated...
Comparatively little is known about atmospheric chemistry on Uranus and Neptune, because remote spectral observations of these cold, distant ‘Ice Giants’ are challenging, each planet has only been visited by a single spacecraft during brief flybys in the 1980s. Thermochemical equilibrium expected to control composition deeper, hotter regions atmosphere both planets, but disequilibrium chemical processes such as transport-induced quenching photochemistry alter upper that can be probed...
Context. The tropospheric wind pattern in Jupiter consists of alternating prograde and retrograde zonal jets with typical velocities up to 100 m/s around the equator. At much higher altitudes, ionosphere, strong auroral have been discovered 1-2 km/s. There is no such direct measurement stratosphere planet. Aims. In this paper, we bridge altitude gap between these measurements by directly measuring speeds Jupiter's stratosphere. Methods. We use Atacama Large Millimeter/submillimeter Array's...
The study of planets and small bodies within our Solar System is fundamental for understanding the formation evolution Earth other planets. Compositional meteorological studies giant provide a foundation nature most commonly observed exoplanets, while spectroscopic observations atmospheres terrestrial planets, moons, comets insights into past present-day habitability planetary environments, availability chemical ingredients life. While prior existing (sub)millimeter have led to major...
Abstract Jupiter's South Polar Region (SPR) was observed by James Webb Space Telescope/Mid‐Infrared Instrument in December 2022. We used the Medium Resolution Spectrometer mode to provide new information about stratosphere. The southern auroral region visible and influenced atmosphere several ways: (a) In interior of oval, we retrieved peak temperatures at two distinct pressure levels near 0.01 1 mbar, with warmer respect non‐auroral regions 12 ± 2 K 37 4 respectively. A cold polar vortex is...
Context. In the past 15 years, several studies suggested that water in stratosphere of Jupiter originated from Shoemaker-Levy 9 (SL9) comet impacts July 1994, but a direct proof was missing. Only very sensitive instrument observing with high spectral/spatial resolution can help to solve this problem. This is case Herschel Space Observatory, which first telescope capable mapping Jupiter's stratosphere.
Dedicated line observations of CH4 rotational lines performed with Herschel/PACS and HIFI in 2009–2011 provide new inferences the mean methane profile upper tropospheres stratospheres Uranus Neptune. At Uranus, is found to be near saturation, a ~9 × 10-4 tropopause/lower stratosphere mole fraction. This nominally six times larger than inferred from Spitzer 2007, although reconciliation may possible if abundance decreases sharply ~100 2 mbar. unexpected situation might reflect heterogeneous...
Three dimensional models that account for chemistry are useful tools to predict the chemical composition of (exo)planet and brown dwarf atmospheres interpret observations future telescopes. Recent Juno NH3 tropospheric distribution in Jupiter also indicate 3D modelling may be necessary constrain deep giant planets Solar System. However, due high computational cost calculations, has so far been limited. A solution include kinetics a model is use reduced scheme. In this view, we have developed...