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THE PDS 66 CIRCUMSTELLAR DISK AS SEEN in POLARIZED LIGHT with the GEMINI PLANET IMAGER

  • Author(s): Wolff, SG
  • Perrin, M
  • Millar-Blanchaer, MA
  • Nielsen, EL
  • Wang, J
  • Cardwell, A
  • Chilcote, J
  • Dong, R
  • Draper, ZH
  • Duchěne, G
  • Fitzgerald, MP
  • Goodsell, SJ
  • Grady, CA
  • Graham, JR
  • Greenbaum, AZ
  • Hartung, M
  • Hibon, P
  • Hines, DC
  • Hung, LW
  • Kalas, P
  • Macintosh, B
  • Marchis, F
  • Marois, C
  • Pueyo, L
  • Rantakyrö, FT
  • Schneider, G
  • Sivaramakrishnan, A
  • Wiktorowicz, SJ
  • et al.
Abstract

We present H- and K-band imaging polarimetry for the PDS 66 circumstellar disk obtained during the commissioning of the Gemini Planet Imager (GPI). Polarization images reveal a clear detection of the disk in to the 0.″12 inner working angle (IWA) in the H band, almost three times closer to the star than the previous Hubble Space Telescope (HST) observations with NICMOS and STIS (0.″35 effective IWA). The centro-symmetric polarization vectors confirm that the bright inner disk detection is due to circumstellar scattered light. A more diffuse disk extends to a bright outer ring centered at 80 AU. We discuss several physical mechanisms capable of producing the observed ring + gap structure. GPI data confirm enhanced scattering on the east side of the disk that is inferred to be nearer to us. We also detect a lateral asymmetry in the south possibly due to shadowing from material within the IWA. This likely corresponds to a temporally variable azimuthal asymmetry observed in HST/STIS coronagraphic imaging.

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