Séminaire, par Héloïse Meheut
Jeudi 13 mars 2014, 14:30, salle de l'entresol
One of the most challenging steps in planet formation theory is the one leading to the formation of planetesimals of kilometre size. Vortices on Earth are known to concentrate solid particles in the eye of the vortex, and a similar process is proposed to concentrate solids in protoplanetary disks and promote planet formation. This vortex scenario is in vogue since the asymmetries observed in protoplanetary disks by the Atacama Large Millimeter Array (ALMA) are proposed to be observational evidence of the presence of Rossby vortices in the disks.
In this talk, I will introduce the vortex scenario for planetesimals formation and discuss the formation of large scale vortices in protoplanetary disks by the Rossby wave instability. I will present an analytical study and global numerical simulations of this instability leading to the formation of Rossby vortices. Then, I will detail the 3D structure of these vortices and its influence on solid concentration. I will conclude by showing how observations could be compared with this theoretical model.
Large scale vortices: the planets birthplace?
One of the most challenging steps in planet formation theory is the one leading to the formation of planetesimals of kilometre size. Vortices on Earth are known to concentrate solid particles in the eye of the vortex, and a similar process is proposed to concentrate solids in protoplanetary disks and promote planet formation. This vortex scenario is in vogue since the asymmetries observed in protoplanetary disks by the Atacama Large Millimeter Array (ALMA) are proposed to be observational evidence of the presence of Rossby vortices in the disks.
In this talk, I will introduce the vortex scenario for planetesimals formation and discuss the formation of large scale vortices in protoplanetary disks by the Rossby wave instability. I will present an analytical study and global numerical simulations of this instability leading to the formation of Rossby vortices. Then, I will detail the 3D structure of these vortices and its influence on solid concentration. I will conclude by showing how observations could be compared with this theoretical model.