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Northwestern University


Weekly Astrophysics Seminars 2015-2016

Seminars are held at 4:00 PM on Tuesdays in Room F160
on the first floor of the Technological Institute (2145 Sheridan Road) unless otherwise noted

 

Fall Quarter 2015

  Date      Speaker / Seminar Host
  Sept. 22

Zhaohuan Zhu
   Princeton University
   Observational Signatures of Young Planets in Disks

Transitional disks are protoplanetary disks with gaps and holes. Although young planets can lead to gaps and holes in disks, recent near-IR polarization imaging (e.g. SEEDS, VLT) and submm (e.g. SMA, ALMA) observations have posed several puzzles. Such as, dust and gas seems to decouple in these disks and the decoupling can occur non-axisymmetrically in disks. Spiral patterns are also discovered in these disks. To understand these new findings, I have carried out hydrodynamic and magnetohydrodynamic global simulations with young planets in disks. Moreover, both dust particle dynamics and non-ideal MHD effects have been considered for the first time. By comparing such realistic simulations with observations, I have constrained protoplanetary disk properties and revealed the early stage of planet formation. Finally, I will discuss the observational strategies to directly find young planets in protoplanetary disks and suggest that accreting circumplanetary disks could be the key to detect young planets directly. Finally, I will suggest that current direct imaging observations have already found some circumplanetary disk candidates and there are more to come.

Sourav Chatterjee

  Sept. 29

Ryan Cooke
   University of California, Santa Cruz
   
The Most Metal-poor Galaxies at High Redshift

Claude-André Faucher-Giguère

  Oct. 13

Tony Piro
   Carnegie Observatories

Vicky Kalogera

  Oct. 20

Thayne Currie
   Subaru Telescope/NAOJ

Fred Rasio

  Nov. 3

Raffaella Margutti
   Harvard University
   Eruptions, Disruptions and Explosions: Massive Stars at the End of their Lives

Vicky Kalogera

  Nov. 17

Maryam Modjaz
   New York University
   Stellar Forensics with Explosions: Supernovae, Gamma-Ray Bursts, and their Environments

Vicky Kalogera

  Nov. 24

Joop Schaye
   Leiden Observatory

Claude-André Faucher-Giguère

  Dec. 1

Yuan Li
   University of Michigan

Claude-André
Faucher-Giguère


For more information, contact: ciera@northwestern.edu


Past Astrophysics Seminars