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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.
Published Web Location
https://doi.org/10.3847/2041-8205/818/1/L15Abstract
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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