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21 results on '"Viscardy, Sebastien"'

1. CO2 in the atmosphere of Mars depleted in 13C

Author

Liuzzi, Giuliano, Villanueva, Geronimo L., Aoki, Shohei, Stone, Shane W., Faggi, Sara, Trompet, Loïc, Neary, Lori, Daerden, Frank, Viscardy, Sébastien, Masiello, Guido, Serio, Carmine, Thomas, Ian R., Patel, Manish R., Bellucci, Giancarlo, Lopez-Moreno, Jose-Juan, Ristic, Bojan, and Vandaele, Ann Carine

Published
2024
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2. Calibration of the NOMAD-UVIS data

Author

Willame, Yannick, Depiesse, Cédric, Mason, Jonathon P., Thomas, Ian R., Patel, Manish R., Hathi, Brijen, Leese, Mark R., Bolsée, David, Wolff, Michael J., Trompet, Loïc, Vandaele, Ann Carine, Piccialli, Arianna, Aoki, Shohei, Ristic, Bojan, Neefs, Eddy, Beeckman, Bram, Berkenbosch, Sophie, Clairquin, Roland, Mahieux, Arnaud, Pereira, Nuno, Robert, Séverine, Viscardy, Sébastien, Wilquet, Valérie, Daerden, Frank, Lopez-Moreno, José Juan, and Bellucci, Giancarlo

Published
2022
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3. Comprehensive investigation of Mars methane and organics with ExoMars/NOMAD

Author

Knutsen, Elise W., Villanueva, Geronimo L., Liuzzi, Giuliano, Crismani, Matteo M.J., Mumma, Michael J., Smith, Michael D., Vandaele, Ann Carine, Aoki, Shohei, Thomas, Ian R., Daerden, Frank, Viscardy, Sébastien, Erwin, Justin T., Trompet, Loic, Neary, Lori, Ristic, Bojan, Lopez-Valverde, Miguel Angel, Lopez-Moreno, Jose Juan, Patel, Manish R., Karatekin, Ozgur, and Bellucci, Giancarlo

Published
2021
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4. Viscosity from Newton to Modern Non-equilibrium Statistical Mechanics

Author

Viscardy, Sebastien

Subjects
Condensed Matter - Statistical Mechanics, Physics - History and Philosophy of Physics
Abstract

In the second half of the 19th century, the kinetic theory of gases has probably raised one of the most impassioned debates in the history of science. The so-called reversibility paradox around which intense polemics occurred reveals the apparent incompatibility between the microscopic and macroscopic levels. While classical mechanics describes the motion of bodies such as atoms and molecules by means of time reversible equations, thermodynamics emphasizes the irreversible character of macroscopic phenomena such as viscosity. Aiming at reconciling both levels of description, Boltzmann proposed a probabilistic explanation. Nevertheless, such an interpretation has not totally convinced generations of physicists, so that this question has constantly animated the scientific community since his seminal work. In this context, an important breakthrough in dynamical systems theory has shown that the hypothesis of microscopic chaos played a key role and provided a dynamical interpretation of the emergence of irreversibility. Using viscosity as a leading concept, we sketch the historical development of the concepts related to this fundamental issue up to recent advances. Following the analysis of the Liouville equation introducing the concept of Pollicott-Ruelle resonances, two successful approaches --- the escape-rate formalism and the hydrodynamic-mode method --- establish remarkable relationships between transport processes and chaotic properties of the underlying Hamiltonian dynamics., Comment: 78 pages, 11 figures, submitted to Studies in History and Philosophy of Modern Physics

Published
2006

5. Viscosity and Microscopic Chaos : The Helfand-moment Approach

Author

Viscardy, Sebastien

Subjects
Condensed Matter - Statistical Mechanics
Abstract

In this thesis, we first devote a section on the history of the concept of irreversibility; of the hydrodynamics, branch of physics in which the viscosity appears; of the kinetic theory of gases establishing relationships between the microscopic dynamics and macroscopic processes like viscosity; and, finally, the interest brought in statistical mechanics of irreversible processes by the theory of chaos, more precisely, the microscopic chaos. We propose a method based on the Helfand moment in order to calculate the viscosity properties in systems of particles with periodic boundary conditions. We apply this method to the simplest system in which viscosity already exists: the two-hard-disk model. The escape-rate formalism, establishing a direct relation between chaotic quantities of the microscopic dynamics (e.g. Lyapunov exponents, fractal dimensions, etc.), is applied in this system. The results are in excellent agreement with those obtained by our Helfand-moment method. We extend the calculation of the viscosity properties to systems with more than two hard balls. Finally, we compute viscosity as well as thermal conductivity thanks to our own method also based on the Helfand moment., Comment: PhD Thesis (September 21, 2005) : Center for Nonlinear Phenomena and Complex Systems, Universite Libre de Bruxelles, Belgium (231 pages)

Published
2005

6. Observations and ongoing calibration of the infrared channels of NOMAD on ExoMars Trace Gas Orbiter

Author

Thomas, Ian, primary, Trompet, Loic, additional, Erwin, Justin, additional, Aoki, Shohei, additional, Vandaele, Ann Carine, additional, Daerden, Frank, additional, Ristic, Bojan, additional, Willame, Yannick, additional, Robert, Severine, additional, Piccialli, Arianna, additional, Flimon, Zachary, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Patel, Manish, additional, Bellucci, Giancarlo, additional, and Lopez-Moreno, Jose Juan, additional

Published
2022
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7. Relationship between the ozone and water vapour vertical profiles on Mars observed by NOMAD-TGO

Author

Piccialli, Arianna, primary, Vandaele, Ann Carine, additional, Aoki, Shohei, additional, Willame, Yannick, additional, Depiesse, Cedric, additional, Trompet, Loic, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Daerden, Frank, additional, Erwin, Justin, additional, Thomas, Ian R., additional, Ristic, Bojan, additional, Mason, Jon, additional, Patel, Manish, additional, Khayat, Alain, additional, Wolff, Michael, additional, Bellucci, Giancarlo, additional, and Lopez Moreno, Jose Juan, additional

Published
2021
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8. Probing the Atmospheric Cl Isotopic Ratio on Mars: Implications for Planetary Evolution and Atmospheric Chemistry

Author

Liuzzi, Giuliano, primary, Villanueva, Geronimo L., additional, Viscardy, Sebastien, additional, Mège, Daniel, additional, Crismani, Matteo M. J., additional, Aoki, Shohei, additional, Gurgurewicz, Joanna, additional, Tesson, Pierre‐Antoine, additional, Mumma, Michael J., additional, Smith, Michael D., additional, Faggi, Sara, additional, Kofman, Vincent, additional, Knutsen, Elise W., additional, Daerden, Frank, additional, Neary, Lori, additional, Schmidt, Frédéric, additional, Trompet, Loïc, additional, Erwin, Justin T., additional, Robert, Séverine, additional, Thomas, Ian R., additional, Ristic, Bojan, additional, Bellucci, Giancarlo, additional, Lopez‐Moreno, Jóse Juan, additional, Patel, Manish R., additional, and Vandaele, Ann Carine, additional

Published
2021
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9. Probing the Atmospheric Cl Isotopic Ratio on Mars: Implications for Planetary Evolution and Atmospheric Chemistry

Author

Belgian Science Policy Office, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), UK Space Agency, National Aeronautics and Space Administration (US), Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agenzia Spaziale Italiana, European Space Agency, Liuzzi, Giuliano, Villanueva, Geronimo L., Viscardy, Sebastien, Mège, Daniel, Crismani, Matteo M. J., Aoki, Shohei, Gurgurewicz, Joanna, Tesson, Pierre-Antoine, Mumma, Michael J., Smith, Michael D., Faggi, Sara, Kofman, Vincent, Knutsen, Elise W., Daerden, Frank, Neary, Lori, Schmidt, Frédéric, Trompet, Loïc., Erwin, Justin T., Robert, Séverine, Thomas, Ian R., Ristic, Bojan, Bellucci, Giancarlo, López-Moreno, José Juan, Patel, Manish R., Vandaele, Ann Carine, Belgian Science Policy Office, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), UK Space Agency, National Aeronautics and Space Administration (US), Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agenzia Spaziale Italiana, European Space Agency, Liuzzi, Giuliano, Villanueva, Geronimo L., Viscardy, Sebastien, Mège, Daniel, Crismani, Matteo M. J., Aoki, Shohei, Gurgurewicz, Joanna, Tesson, Pierre-Antoine, Mumma, Michael J., Smith, Michael D., Faggi, Sara, Kofman, Vincent, Knutsen, Elise W., Daerden, Frank, Neary, Lori, Schmidt, Frédéric, Trompet, Loïc., Erwin, Justin T., Robert, Séverine, Thomas, Ian R., Ristic, Bojan, Bellucci, Giancarlo, López-Moreno, José Juan, Patel, Manish R., and Vandaele, Ann Carine

Abstract

Following the recent detection of HCl in the atmosphere of Mars by ExoMars/Trace Gas Orbiter, we present here the first measurement of the 37Cl/35Cl isotopic ratio in the Martian atmosphere using a set of Nadir Occultation for MArs Discovery (NOMAD) observations. We determine an isotopic anomaly of −6 ± 78‰ compared to Earth standard, consistent with the −51‰–−1‰ measured on Mars’ surface by Curiosity. The measured isotopic ratio is also consistent with surface measurements, and suggests that Cl reservoirs may have undergone limited processing since formation in the Solar Nebula. The examination of possible sources and sinks of HCl shows only limited pathways to short-term efficient Cl fractionation and many plausible reservoirs of “light” Cl. © 2021. American Geophysical Union.

Published
2021

10. Ozone vertical profiles from TGO/NOMAD-UVIS: an inter-comparison of three retrieval schemes

Author

Piccialli, Arianna, primary, Vandaele, Ann Carine, additional, Willame, Yannick, additional, Aoki, Shohei, additional, Depiesse, Cedric, additional, Trompet, Loic, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Daerden, Frank, additional, Erwin, Justin, additional, Thomas, Ian R., additional, Ristic, Bojan, additional, Mason, Jon, additional, Patel, Manish, additional, Khayat, Alain, additional, Wolff, Michael, additional, Bellucci, Giancarlo, additional, and Lopez Moreno, Jose Juan, additional

Published
2021
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11. NOMAD on ExoMars TGO: Data processing and public release via the ESA Planetary Science Archive

Author

Thomas, Ian, primary, Vandaele, Ann Carine, additional, Daerden, Frank, additional, Ristic, Bojan, additional, Willame, Yannick, additional, Depiesse, Cedric, additional, Aoki, Shohei, additional, Trompet, Loic, additional, Erwin, Justin, additional, Robert, Severine, additional, Piccialli, Arianna, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Mason, Jon, additional, Patel, Manish, additional, Bellucci, Giancarlo, additional, and Lopez-Moreno, Jose Juan, additional

Published
2020
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12. Water vapor vertical profiles on Mars: Results from the first full Mars Year of TGO/NOMAD science operations

Author

Aoki, Shohei, primary, Vandaele, AnnCarine, additional, Daerden, Frank, additional, Villanueva, Geronimo, additional, Thomas, Ian, additional, Erwin, Justin, additional, Trompet, Loic, additional, Robert, Severine, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Piccialli, Arianna, additional, Liuzzi, Giuliano, additional, Crismani, Matteo, additional, Clancy, Todd, additional, Smith, Micheal, additional, Ristic, Bojan, additional, Lopez-Valverde, Miguel-Angel, additional, Patel, Manish, additional, Bellucci, Giancarlo, additional, and Lopez-Moreno, Jose-Juan, additional

Published
2020
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13. Impact of gradients at the Martian terminator on the retrieval of ozone from TGO/NOMAD-UVIS

Author

Piccialli, Arianna, primary, Vandaele, Ann Carine, additional, Willame, Yannick, additional, Aoki, Shohei, additional, Depiesse, Cedric, additional, Trompet, Loic, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Daerden, Frank, additional, Erwin, Justin, additional, Thomas, Ian R., additional, Ristic, Bojan, additional, Mason, Jon P., additional, Patel, Manish, additional, Bellucci, Giancarlo, additional, and Lopez-Moreno, Jose-Juan, additional

Published
2020
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14. Retrievals of dust and ozone from NOMAD-UVIS

Author

Piccialli, Arianna, primary, Vandaele, Ann Carine, additional, Willame, Yannick, additional, Depiesse, Cedric, additional, Trompet, Loic, additional, Neary, Lori, additional, Viscardy, Sebastien, additional, Daerden, Frank, additional, Thomas, Ian R., additional, Ristic, Bojan, additional, Mason, Jon P., additional, Patel, Manish, additional, Bellucci, Giancarlo, additional, and Lopez Moreno, Jose Juan, additional

Published
2020
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16. Probing the Atmospheric Cl Isotopic Ratio on Mars: Implications for Planetary Evolution and Atmospheric Chemistry

Author

Liuzzi, Giuliano, Villanueva, Geronimo L., Viscardy, Sebastien, Mège, Daniel, Crismani, Matteo M. J., Aoki, Shohei, Gurgurewicz, Joanna, Tesson, Pierre‐Antoine, Mumma, Michael J., Smith, Michael D., Faggi, Sara, Kofman, Vincent, Knutsen, Elise W., Daerden, Frank, Neary, Lori, Schmidt, Frédéric, Trompet, Loïc, Erwin, Justin T., Robert, Séverine, Thomas, Ian R., Ristic, Bojan, Bellucci, Giancarlo, Lopez‐Moreno, Jóse Juan, Patel, Manish R., Vandaele, Ann Carine, Liuzzi, Giuliano, Villanueva, Geronimo L., Viscardy, Sebastien, Mège, Daniel, Crismani, Matteo M. J., Aoki, Shohei, Gurgurewicz, Joanna, Tesson, Pierre‐Antoine, Mumma, Michael J., Smith, Michael D., Faggi, Sara, Kofman, Vincent, Knutsen, Elise W., Daerden, Frank, Neary, Lori, Schmidt, Frédéric, Trompet, Loïc, Erwin, Justin T., Robert, Séverine, Thomas, Ian R., Ristic, Bojan, Bellucci, Giancarlo, Lopez‐Moreno, Jóse Juan, Patel, Manish R., and Vandaele, Ann Carine

Abstract

Following the recent detection of HCl in the atmosphere of Mars by ExoMars/Trace Gas Orbiter, we present here the first measurement of the 37Cl/35Cl isotopic ratio in the Martian atmosphere using a set of Nadir Occultation for MArs Discovery (NOMAD) observations. We determine an isotopic anomaly of −6 ± 78‰ compared to Earth standard, consistent with the −51‰–−1‰ measured on Mars’ surface by Curiosity. The measured isotopic ratio is also consistent with surface measurements, and suggests that Cl reservoirs may have undergone limited processing since formation in the Solar Nebula. The examination of possible sources and sinks of HCl shows only limited pathways to short‐term efficient Cl fractionation and many plausible reservoirs of “light” Cl.

17. Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD

Author

Villanueva, Geronimo L., Liuzzi, Giuliano, Crismani, Matteo M. J., Aoki, Shohei, Vandaele, Ann Carine, Daerden, Frank, Smith, Michael D., Mumma, Michael J., Knutsen, Elise W., Neary, Lori, Viscardy, Sebastien, Thomas, Ian R., Lopez-Valverde, Miguel Angel, Ristic, Bojan, Patel, Manish R., Holmes, James A., Bellucci, Giancarlo, Lopez-Moreno, Jose Juan, Villanueva, Geronimo L., Liuzzi, Giuliano, Crismani, Matteo M. J., Aoki, Shohei, Vandaele, Ann Carine, Daerden, Frank, Smith, Michael D., Mumma, Michael J., Knutsen, Elise W., Neary, Lori, Viscardy, Sebastien, Thomas, Ian R., Lopez-Valverde, Miguel Angel, Ristic, Bojan, Patel, Manish R., Holmes, James A., Bellucci, Giancarlo, and Lopez-Moreno, Jose Juan

Abstract

sotopic ratios and, in particular, the water D/H ratio are powerful tracers of the evolution and transport of water on Mars. From measurements performed with ExoMars/NOMAD, we observe marked and rapid variability of the D/H along altitude on Mars and across the whole planet. The observations (from April 2018 to April 2019) sample a broad range of events on Mars, including a global dust storm, the evolution of water released from the southern polar cap during southern summer, the equinox phases, and a short but intense regional dust storm. In three instances, we observe water at very high altitudes (>80 km), the prime region where water is photodissociated and starts its escape to space. Rayleigh distillation appears the be the driving force affecting the D/H in many cases, yet in some instances, the exchange of water reservoirs with distinctive D/H could be responsible.

18. Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD

Author

Villanueva, Geronimo L., Liuzzi, Giuliano, Crismani, Matteo M. J., Aoki, Shohei, Vandaele, Ann Carine, Daerden, Frank, Smith, Michael D., Mumma, Michael J., Knutsen, Elise W., Neary, Lori, Viscardy, Sebastien, Thomas, Ian R., Lopez-Valverde, Miguel Angel, Ristic, Bojan, Patel, Manish R., Holmes, James A., Bellucci, Giancarlo, Lopez-Moreno, Jose Juan, Villanueva, Geronimo L., Liuzzi, Giuliano, Crismani, Matteo M. J., Aoki, Shohei, Vandaele, Ann Carine, Daerden, Frank, Smith, Michael D., Mumma, Michael J., Knutsen, Elise W., Neary, Lori, Viscardy, Sebastien, Thomas, Ian R., Lopez-Valverde, Miguel Angel, Ristic, Bojan, Patel, Manish R., Holmes, James A., Bellucci, Giancarlo, and Lopez-Moreno, Jose Juan

Abstract

sotopic ratios and, in particular, the water D/H ratio are powerful tracers of the evolution and transport of water on Mars. From measurements performed with ExoMars/NOMAD, we observe marked and rapid variability of the D/H along altitude on Mars and across the whole planet. The observations (from April 2018 to April 2019) sample a broad range of events on Mars, including a global dust storm, the evolution of water released from the southern polar cap during southern summer, the equinox phases, and a short but intense regional dust storm. In three instances, we observe water at very high altitudes (>80 km), the prime region where water is photodissociated and starts its escape to space. Rayleigh distillation appears the be the driving force affecting the D/H in many cases, yet in some instances, the exchange of water reservoirs with distinctive D/H could be responsible.

19. Impact of the 2018 Mars global dust storm on water vapour as observed by NOMAD on ExoMars Trace Gas Orbiter.

Author

Vandaele, Ann Carine, Daerden, Frank, Thomas, Ian R., Aoki, Shohei, Depiesse, Cedric, Erwin, Justin, Neary, Lori, Piccialli, Arianna, Ristic, Bojan, Robert, Severine, Trompet, Loïc, Viscardy, Sebastien, Willame, Yannick, Wilquet, Valerie, Altieri, Francesca, Smith, Michael, Villanueva, Geronimo, Lopez-Moreno, Jose-Juan, Bellucci, Giancarlo, and Patel, Manish R.

Published
2019

20. Ozone vertical profiles from NOMAD-UVIS: a preliminary analysis.

Author

Piccialli, Arianna, Vandaele, Ann Carine, Willame, Yannick, Depiesse, Cedric, Trompet, Loïc, Neary, Lori, Viscardy, Sebastien, Daerden, Frank, Thomas, Ian R., Ristic, Bojan, Mason, Jon P., Patel, Manish R., Bellucci, Giancarlo, and Lopez-Moreno, Jose-Juan

Published
2019

21. Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD.

Author

Villanueva GL, Liuzzi G, Crismani MMJ, Aoki S, Vandaele AC, Daerden F, Smith MD, Mumma MJ, Knutsen EW, Neary L, Viscardy S, Thomas IR, Lopez-Valverde MA, Ristic B, Patel MR, Holmes JA, Bellucci G, and Lopez-Moreno JJ

Abstract

Isotopic ratios and, in particular, the water D/H ratio are powerful tracers of the evolution and transport of water on Mars. From measurements performed with ExoMars/NOMAD, we observe marked and rapid variability of the D/H along altitude on Mars and across the whole planet. The observations (from April 2018 to April 2019) sample a broad range of events on Mars, including a global dust storm, the evolution of water released from the southern polar cap during southern summer, the equinox phases, and a short but intense regional dust storm. In three instances, we observe water at very high altitudes (>80 km), the prime region where water is photodissociated and starts its escape to space. Rayleigh distillation appears the be the driving force affecting the D/H in many cases, yet in some instances, the exchange of water reservoirs with distinctive D/H could be responsible., (Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)

Published
2021
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