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SUMMARY:What can we learn from ALMA polarimetric observations of protoplan
 etary disks?
DTSTART;VALUE=DATE-TIME:20200512T142500Z
DTEND;VALUE=DATE-TIME:20200512T144500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115618Z
UID:indico-contribution-14@meetings.aip.de
DESCRIPTION:Speakers: Akimasa Kataoka (National Astronomical Observatory o
 f Japan)\nPolarimetric observations of protoplanetary disks at millimeter 
 wavelengths have been dramatically developing owing to its high-sensitivit
 y and high-resolution observations with ALMA. However\, the mechanisms of 
 the polarization are under discussion. The proposed mechanisms so far are 
 the self-scattering and the grain alignment\, but the alignment directions
  are possibly with magnetic fields\, with radiation fields\, or with gas-d
 rag directions. In this talk\, I first review the possible mechanisms that
  may produce the millimeter polarization\, and then present the case studi
 es of different disks. On the lopsided disk of HD 142527\, we found that t
 he magnetic fields are dominated by the toroidal components at least in th
 e south regions. On the ring-gap disk of HD 163296\, by modeling the self-
 scattering polarization\, we found that the dust scale height is lower in 
 the inner regions\, which indicates the low turbulence of gas in the inner
  disk and is consistent with the concept of magnetic dead zone. I also dis
 cuss possible constraints on the grain dynamics on AS 209 and HL Tau by mo
 deling the gas-flow aligned dust grains.\n\nhttps://meetings.aip.de/event/
 1/contributions/14/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/1/contributions/14/
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