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The PDS 66 Circumstellar Disk as Seen in Polarized Light with the Gemini Planet Imager

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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Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, June 9, 2022 - 10:50:37 AM
Last modification on : Saturday, June 25, 2022 - 3:06:19 AM

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Schuyler G. Wolff, Marshall Perrin, Maxwell A. Millar-Blanchaer, Eric L. Nielsen, Jason Wang, et al.. The PDS 66 Circumstellar Disk as Seen in Polarized Light with the Gemini Planet Imager. The Astrophysical Journal Letters, 2016, 818, ⟨10.3847/2041-8205/818/1/L15⟩. ⟨insu-03691568⟩



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