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DTSTAMP:20260413T191938
DTSTART:20160217T110000
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URL:https://murmitoyen.com/events/vanille/udem/detail/680434-spirals-gaps-a
 nd-cavities-in-circumstellar-disks-are-we-watching-planets-forming-in-acti
 on-ruobing-dong-uc-berkeley
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Spirals\, Gaps\, and Cavities in Circumstellar Disks: Are We Watchi
 ng Planets Forming in Action? - Ruobing Dong (UC Berkeley)
DESCRIPTION:Ruobing Dong\, Astronomy Department\, UC Berkeley
Abstract:
Pla
 nets\, like the ones in our own solar system\, form in circumstellar disks
  surrounding newly born stars. We are about to enter a golden age in the f
 ield of planet formation and circumstellar disks\, thanks to a fleet of ne
 w instruments with unprecedented resolving power that have just come onlin
 e in the past few years. At near-infrared wavelengths\, technological adva
 nces in adaptive optics and the use of differential imaging techniques hav
 e enabled us to achieve angular resolutions of 0.05 arcsec and inner worki
 ng angles of 0.1 arcsec. At mm wavelengths\, the Atacama Large Millimeter 
 Array (ALMA) has brought us over one order of magnitude improvement over e
 xisting facilities in both resolution and sensitivity. Now for the first t
 ime in history\, we are able to directly detect signals from planet format
 ion activities on a solar system scale in nearby disks. Recent observation
 s using the most powerful telescopes on Earth\, such as Subaru\, VLT\, Gem
 ini\, and ALMA\, have revealed exciting fine structures\, such as spiral a
 rms\, gaps\, and cavities\, in many gaseous circumstellar disks. These str
 uctures have been widely speculated to be related to ongoing planet format
 ion\, though the mechanisms are currently in hot debate. In my talk I will
  review the major discoveries in observations of disks made in the past fe
 w years\, and discuss their possible origins\; particularly\, whether they
  are induced by embedded planets currently forming in these disks. Lastly\
 , I will picture my vision of the field in the coming decades\; specifical
 ly\, what are the questions that should be and will be addressed by the cu
 rrent and next generations of instruments\, and what am I going to do to a
 nswer these questions.
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