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Nom de l'évènement
Exoplanetary Atmosphere and Habitability

Dates de l'évènement
12/10/2015 - 16/10/2015
Toute la journée

Site web de l'évènement

Observatoire de la cote d'azur


The aim of the workshop is to discuss about chemical disequilibrium and its link to planetary habitability. In particular, the Thermodynamics, Disequilibrium and Evolution focus group seeks to understand how disequilibria are generated in geological / chemical / biological systems, and how these disequilibria can lead to emergent phenomena, such as self-organization and eventually, metabolism.

The prospects for planetary atmosphere characterization are excellent with access to large an amount of data for different kind of stars either with ground- or space-based telescopes supported by accurate modeling of the atmospheric compositions and their corresponding spectra. In particular for many discovered exoplanets (hot and gaseous), a large chemical disequilibrium in the atmosphere has been observed, due to the high vertical temperature gradient. Several new studies are now comparing this of vertical-mixing driven disequilibrium with the chemical disequilibrium characterizing the atmosphere of planet Earth, which is mainly due to the presence of life. However, present research on exoplanet’s atmospheric disequilibrium is focused on a very small number of compounds (CH4, CO, CO2, H2O), lacking for a generalized and wider methodology. In this workshop we plan to enlarge these studies to a joint effort between the thermodynamics of habitable conditions to the exoplanetary atmospheres.

The workshop at the Observatory of Côte d’Azur (OCA) is the main opportunity in Europe in 2015 to discuss about the connection between planetary habitability and its atmospheric disequilibrium, through the use of some thermodynamic functions. OCA has a long tradition in the field of theoretical planetology. The reasearch are focused on the detection and study of extra-solar planets, protoplanetary disks, and on the formationand volution of planetary systems. This will ensure an excellent context for local exchanges.

Three principal topics will be tackled during the workshop:

  1. Icy moons, icy planets and the conditions for the emergence of life
  2. The modeling and observations of exoplanetary atmospheres: chemistry and physics
  3. The chemical disequilibrium in planetary atmospheres: from hot Jupiters to habitable planets

The Thermodynamic, Disequilibrium and Evolution (TDE) Focus Group is a NASA Astrobiology Institute (NAI) sponsored project aimed to make researchers meet and discuss on the thermodynamic requirements of life emergence and planetary habitability. In particular, since its set up in 2011, the TDE helped in bridging the gap between researchers working on the theory and experimental aspects of the Origin of Life and astronomers. It provided a thermodynamic discussion board for planning future space missions and deciding on future targets for the search for habitability. The TDE concentrates on the entropy and energy requirements for life and planets and how they inform our selection of potentially habitable planets and environments in the cosmos.

The TDE page on the NAI website: https://astrobiology.nasa.gov/focus-groups/current/thermodynamics-disequilibrium-and-evolution-tde/

The TDE Focus Group meets twice per year. Since its establishment in 2011, there have been six workshops: Madrid (Spain), Florence (Italy), Atlanta (USA), Granada (Spain), Phoenix (USA),  Florence again, Campinas (Brazil) and Tokyo (Japan).

Important Dates

  • December, 2014 : First announcement and web site
  • December 1st, 2014 : Registration and abtract submission open
  • April 30th, 2015 : Deadline for financial support request check here for information
  • June 30th, 2015 : Deadline for registration, fee payment (100 euro) and abstract submission
  • October 12th, 2015 : The workshop starts


  • Daniel Angerhausen (NASA Goddard, USA)
  • Laurie Barge (Jet Propulsion Laboratory, USA)
  • Philippe Bendjoia (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • John Robert Brucato (Arcetri Observatory, Firenze, Italy)
  • Andrea Chiavassa (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Sebastian Danielache (Sophia University Tokyo, Japan)
  • Armando Domiciano (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Douglas Galante (Laboratório Nacional de Luz Síncrotron, Brasil)
  • Tristan Guillot (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Claudia Lage (Rio de Janeiro Federal University, Brasil)
  • Eduardo Janot Pacheco (Universidade de São Paulo, Brasil)
  • Franck Selsis (Observatoire de Bordeaux, France)
  • Eugenio Simoncini (Arcetri Observatory, Firenze, Italy)


  • Philippe Bendjoia (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Andrea Chiavassa (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Armando Domiciano (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Tristan Guillot (Observatoire de la Côte d’Azur, Lagrange, Nice, France)
  • Christophe Pere (Observatoire de la Côte d’Azur, Lagrange, Nice, France)


For any information, please contact exoatmo@sciencesconf.org