Recorded Talks

One of the unexpected plus sides of the pandemic is that many talks and lectures are available to broader audiences which did not have access before. Below you can find some recorded talks or lectures I have given since the Covid-19 pandemic started.

Talk "Radial substructure of exoKuiper belts: revealing Neptune analogues", Exoplanets III, July 29th 2020

Abstract: In the last few years, multiwavelength observations have revealed the ubiquity of gaps/rings in protoplanetary discs, suggesting the presence of planets forming at tens of au. Such a planet population likely migrates inwards to end up in orbits within 10 au. At later stages, however, debris/planetesimal discs analogous to the Kuiper belt have revealed a rich radial structure, which suggests that planets can still reside at tens of au. In this talk, I will give a review on the different radial structures that are observed in debris discs, discuss their potential origin and how they can be used to probe the population of Neptune analogues. I will focus specifically on three 0.1-1 Gyr old systems that we observed with ALMA, which have gaps at tens of au suggesting the presence of Neptune analogues. Using this ALMA data and dynamical considerations, it is possible to set tight constraints on the orbits and masses of these planets that carved these gaps. These results suggest that low mass planets at tens of au could be common, which could be confirmed by future and more sensitive direct imaging instruments.

Lecture "Planetesimal/debris discs", IAA-CSIC Severo Ochoa School on (exo)planetary systems, January 2021

Abstract: Planetary systems are not only composed of planets, but also of minor bodies similar to asteroids and comets which we typically found in belts analogous to the Asteroid and Kuiper belt in the Solar System. Although we cannot detect these bodies individually, mutual collisions between these km-sized planetesimals produce high dust levels that are readily detectable around 30% of nearby stars. These planetesimals form as a byproduct of planet formation, and their distribution is shaped by the presence of planets in the same way the Asteroid and the Kuiper belts were shaped by Jupiter and Neptune, respectively. Therefore planetesimal discs provide unique and complementary constraints on the architecture and dynamics of planetary systems. In this lecture, I will summarise how planetesimal/debris discs are studied today, with special focus on Kuiper belt analogues (or exoKuiper belts) to show how over the last few years we have been able to constrain their volatile composition, radial distribution, and interaction with known or unseen planets.