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Solar and Planetary Systems

The activities of the team are focused on three major investigations: study of the processes of evolution of the planetary bodies of the Solar System, study of exoplanets, and study of the initial conditions of the Solar System. More specifically, we attempt to study:

- evolution processes by observations of differentiated bodies (terrestrial and giant planets, satellites). These activities are performed through space instruments mounted on orbital or in situ platforms;
- the extra-solar planets by a theoretical but also observational approach through the COROT, PLATO and ARIEL missions;
- the initial conditions for the formation of the Solar System through the study of primitive matter: cometary grains, meteorites, observations of primitive bodies and the interplanetary environment.

Our approach consists in coupling the observation acquired by space instruments, extensive data reduction, numerical modeling and laboratory measurements. These multiple approaches are based on as strong and major instrumental developments with the constant concern to combine both scientific and technological challenges.

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Dernières news

6 years 7 months ago


The enormous quantity and complexity of planetary data acquired by spacecraft during the last two decades has created a demand within the planetary community for access to the raw and high level data archives and to the tools necessary to analyze these data. The number and the size of the datasets are so large that an information system to process, manage and distribute data is critical. In this framework, the Observatories of Paris Sud (OSUPS) and Lyon (OSUL) have recently developed a portal, called PSUP (Planetary SUrface Portal), to provide users with efficient and easy access to these data products.

 

7 years 7 months ago

In situ images of 67P/Churyumov-Gerasimenko acquired by the 7 CIVA cameras on board Philae revealed a singular, unexpected, and very irregular landscape dominated by consolidated materials. Following a detailed study, this landing site provided a unique opportunity to constrain the past and present conditions prevailing at the surface of the comet.

8 years 3 months ago

Gullies observed on Mars would be produced by the action of dry ice in winter and spring, not by liquid water flows as thought before. Indeed, recent numerical simulations show that under dry ice heated by the Sun, intense gas motions can destabilize and fluidize the soil, until they create flows similar to those created by a liquid.

8 years 5 months ago

Ongoing flow activity was highlighted a few years ago on Mars by high-resolution cameras. Various flow types have been identified (new channels, dark lineae, bright deposits…) but there is still no consensus about possible formation mechanisms: dry avalanche? liquid water? carbon dioxide ice? A study conducted at the Institut d’Astrophysique Spatiale reveals for the first time the composition of winter ice forming in association with flows. Results suggest the coexistence of several current formation mechanisms.

8 years 10 months ago

After 7 long months, Philae has awoken from hibernation. Its first signs of life reached Earth on Saturday evening (June, 13th) then again the following night. The hope to see Philae awake again and communicating has just come true.

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