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Accueil > Séminaires > Archive des séminaires d’Utinam > 2013

Héloïse Méheut

Do planets form inside vortices ?

mercredi 20 mars 2013, 14h

salle de conférences de l’observatoire

Héloïse Méheut, Laboratoire AIM, CEA Saclay

Résumé :

Rossby waves are well known in meteorology as a formation mechanism for cyclones, but recently they have also been used in astrophysics. The physical mechanisms they involve are especially interesting in differentially rotating disks where they can destabilize the whole disk. I will describe how this Rossby wave instability can help planet formation in protoplanetary disks, by forming large scale vortices and finally concentrating solids in their center. Historically, the Rossby wave instability has mainly been studied in 2D disks with no vertical stratification. I will present the first full 3D studies of this instability and show how taking into account the vertical dimension of these disks helped solving the puzzle of planetesimals formation.