Gaspard Duchêne – On the demographics and structure of protoplanetary disks

Quand :
29 mai 2024 @ 11 h 00 min – 12 h 30 min
Où :
B18N, Salle Univers

Titre: On the demographics and structure of protoplanetary disks

Par : Gaspard Duchêne (IPAG)

Abstract: Protoplanetary disks represent the birth environment of the mature exoplanets now known by the thousands. Over the past decade, several major instrumentation breakthroughs (such as HST, « extreme » adaptive optics, ALMA and now JWST) have led to a slew of high-resolution observations that shed crucial light on the structure of these disks and on the processes at play in forming these planets. In this talk, I will illustrate how a unique observing point of view, when disks are seen almost exactly edge-on, provides both a much less biased view of the demographics of protoplanetary disks, and a unique opportunity to probe their radial and vertical structure. In particular, I will demonstrate how we have used high-resolution observations to quantify the degree of settling of planet-forming pebbles and smaller dust grains, to directly image photoevaporative winds emanating from the surface of some disks, and to find suggestive evidence for the presence of dust-entraining winds far above the disk surface.