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SUMMARY:Tracing velocity substructures in the planet-forming disks of exoA
 LMA - Joe Stadler / Observatoire de la Côte d’Azur
DTSTART:20241127T134000Z
DTEND:20241127T140500Z
UID:TALK224926@talks.cam.ac.uk
CONTACT:Xander Byrne
DESCRIPTION:The measurement of rotation curves led to big discoveries in a
 stronomy\, like the proposition of dark matter halos around galaxies. With
  the emergence of ALMA\, it is now similarly possible to measure the rotat
 ion of gas in protoplanetary disks\, which are several orders of magnitude
  smaller than galaxies. While the overall motion of the gas around newborn
  stars is Keplerian\, with high spectral resolution molecular line observa
 tions\, we can trace small-scale velocity perturbations caused by local pr
 essure variations in the disk\, possibly due to embedded planets. In the t
 alk\, I will discuss how we can observe gas rotation in planet-forming dis
 ks and what we can learn from studying the deviations from Keplerian rotat
 ion. In particular\, I will present results from the rotation curve study 
 for the disks of the exoALMA Large Program. We find that substructures in 
 the deviation from Keplerian rotation are ubiquitous in our sample\, on bo
 th small and large scales\, and can reach up to 15 percent in the most ext
 reme cases. Interestingly\, the majority of the dust continuum rings and g
 aps are co-located with pressure maxima and minima\, respectively. Finally
 \, I will compare the presented results with the predictions from the theo
 ry and put them into the bigger picture of planet formation.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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