Applications of Spiral Density Waves: from Circumstellar disks to Circumplanetary Disks

Recently commissioned telescopes and instruments (e.g., Subaru, GPI, VLA, ALMA, EVLA) are now finally able to resolve the protoplanetary disk down to the scale of a planet's immediate assembly zone, and a rich variety of disk features have been revealed: gaps, large scale disk asymmetry, and spiral arms.  Spiral arms are particularly interesting since they are common features from the planet-disk interaction. If the observed spiral arms are due to embedded planets, the spirals provide strong constraints on the disk structure and the embedded planet properties. In this talk, I will introduce the spiral armtheory in detail and discuss how we can apply them to circumstellar disks. Then I will apply these theories to the tiny disks around the young planet: circumplanetary disks. I will suggest that spiral shocks can lead to efficient accretion in circumplanetary disks. Such accretion process can release a lot of energy and these circumplanetary disks can be lampposts for young planets in disks.

Speaker: 
Zhaohuan Zhu (University of Nevada - Las Vegas)
Location: 
KIAA, First floor meeting room
Time: 
Fri, 2017-07-07 12:00 to 13:00