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Title: THE PDS 66 CIRCUMSTELLAR DISK AS SEEN IN POLARIZED LIGHT WITH THE GEMINI PLANET IMAGER

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.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ; ; ; ; ;  [5] ;  [6] ;  [7] ;  [8] ; ;  [9] ;  [10] ;  [11] ; ;  [12] more »; « less
  1. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States)
  2. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  3. Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada)
  4. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305 (United States)
  5. Astronomy Department, University of California, Berkeley, Berkeley, CA 94720 (United States)
  6. LBT Observatory, University of Arizona, 933 N. Cherry Avenue, Room 552, Tucson, AZ 85721 (United States)
  7. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada)
  8. University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2 (Canada)
  9. Department of Physics and Astronomy, University of California, Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095 (United States)
  10. Gemini Observatory, 670 N. A’ohoku Place, Hilo, HI 96720 (United States)
  11. Eureka Scientific, 2452 Delmer, Suite 100, Oakland, CA 96002 (United States)
  12. Gemini Observatory, Casilla 603, La Serena (Chile)
Publication Date:
OSTI Identifier:
22518616
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 818; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; DETECTION; IMAGES; OPTICS; PLANETS; POLARIMETRY; POLARIZATION; PROTOPLANETS; SCATTERING; SPACE; STARS; STELLAR CORONAE; TELESCOPES; VISIBLE RADIATION