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Institut de minéralogie, de physique des matériaux et de cosmochimie
UMR 7590 - Sorbonne Université/CNRS/IRD/MNHN

About ERC Planet Dive

The discovery of extra-solar planets orbiting other stars has been one of the major breakthroughs in astronomy of the past decades. Exoplanets are common objects in the universe and planetary systems seem to be more diverse than originally predicted. The use of radius-mass relationships has been generalized as a means for understanding exoplanets compositions, in combination with equations of state of main planetary components extrapolated to TeraPascal (TPa) pressures.

In the most current description, Earth-like planets are assumed to be fully differentiated and made of a metallic core surrounded by a silicate mantle, and possibly volatile elements at their surfaces in supercritical, liquid or gaseous states. This model is currently used to infer mass-radius relationship for planets up to 100 Earth masses but rests on poorly known equations of states for iron alloys and silicates, as well as even less known melting properties at TPa pressures.

The ERC Panet Dive thus aims at providing experimental references for equations of state and melting properties up to TPa pressure range, with the combined use of well-calibrated static experiments (laser-heated diamond-anvil cells) and laser- compression experiments capable of developing several Mbar pressures at high temperature, coupled with synchrotron or XFEL X-ray sources. I propose to establish benchmarking values for the equations of states, phase diagrams and melting curves relations at unprecedented P-T conditions. The proposed experiments will be focused on simple silicates, oxides and carbides (SiO2, MgSiO3, MgO, SiC), iron alloys (Fe-S, Fe-Si, Fe-O, Fe-C) and more complex metals (Fe,Si,O,S) and silicates (Mg,Fe)SiO3. Our research team will address key questions concerning planets with 1-5 Earth masses as well as fundamental questions about the existence of heavy rocky cores in giant planets.


Kepler-452b, Kepler-22b, Kepler-69c, Kepler-62f, Kepler-186f © NASA/Ames/JPL-Caltech

Cécile Duflot - 29/01/16

Traductions :

    Egalement dans la rubrique

      Ionisation des glaces sous les pressions des planètes géantes

      L’eau et l’ammoniac sont des molécules simples très abondantes dans l’Univers. En particulier, ces composés seraient, avec le méthane, les constituants majoritaires des couches internes des planètes géantes glacées (Uranus, Neptune), de satellites (Titan, Ganymède) et d’exoplanètes telles que GJ 436b...

      » Lire la suite


      Guillaume Fiquet (Guillaume.Fiquet @

      Directeur de l'institut

      33 +1 44 27 52 17


      Nalini Loret (Nalini.Loret @

      Attachée de direction

      33 +1 44 27 52 17


      Evancia Mahambou (evancia.mahambou @

      Gestion du personnel

      33 +1 44 27 74 99


      Danielle Raddas (cecile.duflot @

      Gestion financière

      33 +1 44 27 56 82


      Cécile Duflot (cecile.duflot @

      Chargée de communication

      33 +1 44 27 46 86


      Expertise de météorites


      Expertise de matériaux et minéraux


      Stages d'observation pour les 3e et les Seconde : (feriel.skouri @


      Adresse postale

      Institut de minéralogie, de physique des matériaux et de cosmochimie - UMR 7590

      Sorbonne Université - 4, place Jussieu - BC 115 - 75252 Paris Cedex 5


      Adresse physique

      Institut de minéralogie, de physique des matériaux et de cosmochimie - UMR 7590 - Sorbonne Université - 4, place Jussieu - Tour 23 - Barre 22-23, 4e étage - 75252 Paris Cedex 5


      Adresse de livraison

      Accès : 7 quai Saint Bernard - 75005 Paris, Tour 22.

      Contact : Antonella Intili : Barre 22-23, 4e étage, pièce 420, 33 +1 44 27 25 61



      Fax : 33 +1 44 27 51 52

      L'IMPMC en chiffres

      L'IMPMC compte environ 195 personnes dont :


      • 40 chercheurs CNRS
      • 46 enseignants-chercheurs
      • 19 ITA CNRS
      • 15 ITA non CNRS
      • 50 doctorants
      • 13 post-doctorants
      • 12 bénévoles


       Chiffres : janvier 2016