10 December 2015: Guillaume Laibe - Planet, or not planet...

On Thursday, November 6th of 2014, the Atacama Large Millimeter/submillimeter Array (ALMA) brought for the first time the birth of planets to our eyes. ALMA probed unexpected dark rings in the disc of HL Tau. How to explain the presence of these structures? Do they reveal the presence of young planets in the disc? To answer this question, we revisited the way dust-and-gas mixtures are usually treated. I will present the new monofluid formalism and show its efficiency for treating small solids. I will then explain what our 3D gas-and-dust simulations tell us about the disc of HL Tau and planet formation in general.