3 juillet - 6 juillet 2018


Habitabilité et conditions d’apparition de la vie

Louis d'Hendecourt, ldh@ias.u-psud.fr

Louis d'Hendecourt (PIIM, Marseille), Muriel Gargaud (LAB, Bordeaux)


With the dramatic increase of the number and variety of exoplanets discovered at a very high pace by a large number of instruments, space-born as well as ground-based, the problem of the existence of life on other worlds is becoming one of the most fascinating and challenging scientific quest for the 21st century. Statistically, it is now a fact that billions of planets in our own galaxy do exist as well as billions of telluric rocky planets out of which one can seriously argue about the habitability conditions. However to date, in the absence of a convincing theoretical/experimental background that may lead, in a given environment, to formalize a definite scheme to describe the transition from the inert to the living states, one is forced to speculate about habitability of planets, no matter how precise our, always limited, observations may become. This workshop will present not only the importance to organize this new field with the help of different disciplines but also tentatively some ideas about the ingredients and environmental conditions necessary for life to emerge. Finally, one must consider that such an intricate problem does face an apparent infinite number of contingencies that may be counteracted by an equivalent number of genericities that, at the present time, leave the question of the ubiquity of life in the universe completely open.

This workshop atelier is organized under the SFE banner http://www.exobiologie.fr/


Program (slight modification)

Après midi de MERCREDI
Chairwoman: Olivia Venot (LISA, Paris)
2pm-2:15pm Guy Perrin (CNRS, INSU, Paris): Introduction
2:15pm-2:40pm Xavier Delfosse (IPAG, Grenoble): The stakes of the search for habitable planets around red dwarfs using radial velocities and transits
2:40pm-3:05pm Emeline Bolmont (AIM, Paris-Saclay, Gif sur Yvette): Constraining the environment and habitability of planets in the TRAPPIST-1 system
3:05pm-3:30pm Christian Mustin (LIEC, Nancy): Exoworlds and molecular niches for habitability
3:30pm-4:00pm Jean-Pierre Bibring (IAS, Orsay): Life's emergence: contingencies et genericities
4:00pm-4:30pm Coffee break
Chairman: Luc Arnold (OHP, Marseille)
4:30pm-4:55pm Olivier Mousis (LAM, Marseille) : Habitability criteria for icy moons in our Solar System (presented by Louis d'Hendecourt)
4:55pm-5:20pm Robert Pascal (IBMM, Montpellier): Are environmental conditions necessary for the emergence of biological organisation?
5:20pm-5:45pm Laurent Rémusat (IMPMC & MNHN, Paris): Extraterrestrial organic matter and the origin of life
5:45pm-6:10pm Nathalie Carrasco (LATMOS, St Quentin en Yvelines): Titan, an icy moon inhabited by prebiotic chemistry
6:10pm-6:30pm Louis d'Hendecourt (PIIM, Marseille): Life... and nothing else!

e-posters in this session

BRETON SylvainTidal heating in multilayer planets : application to the Trappist-1 systeme-poster (click to see)