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polarimetry and flux distribution in the debris disk around hd 32297We present high-contrast angular differential imaging (ADI) observations of the debris disk around HD32297 in H-band, as well as the first polarimetric images for this system in polarized differential imaging (PDI) mode with Subaru/HICIAO. In ADI, we detect the nearly edge-on disk at > or = 5(sigma) levels from approx. 0.45" to approx.1.7" (50-192AU) from the star and recover the spine deviation from the midplane already found in previous works. We also find for the first time imaging and surface brightness (SB) indications for the presence of a gapped structure on both sides of the disk at distances of approx. 0.75" (NE side) and approx. 0.65" (SW side). Global forward-modeling work delivers a best-fit model disk and well-fitting parameter intervals that essentially match previous results, with high-forward scattering grains and a ring located at 110AU. However, this single ring model cannot account for the gapped structure seen in our SB profiles. We create simple double ring models and achieve a satisfactory fit with two rings located at 60 and 95AU, respectively, low-forward scattering grains and very sharp inner slopes. In polarized light we retrieve the disk extending from approx. 0.25-1.6", although the central region is quite noisy and high S/N are only found in the range approx. 0.75-1.2". The disk is polarized in the azimuthal direction, as expected, and the departure from the midplane is also clearly observed. Evidence for a gapped scenario is not found in the PDI data. We obtain a linear polarization degree of the grains that increases from approx. 10% at 0.55" to approx. 25% at 1.6". The maximum is found at scattering angles of 90, either from the main components of the disk or from dust grains blown out to larger radii.
Document ID
20170003363
Document Type
Reprint (Version printed in journal)
Authors
Asensio-Torres, R.
(Stockholm Univ. Sweden)
Janson, M.
(Stockholm Univ. Sweden)
Hashimoto, J.
(National Inst. of Natural Sciences Aichi, Japan)
Thalmann, C.
(Eidgenoessische Technische Hochschule Zurich, Switzerland)
Currie, T.
(Subaru Telescope Hilo, HI, United States)
Buenzli,
(Eidgenoessische Technische Hochschule Zurich, Switzerland)
Kudo, T.
(Subaru Telescope Hilo, HI, United States)
Kuzuhara, M.
(Tokyo Institute of Technology Tokyo, Japan)
Kusakabe, N.
(National Inst. of Natural Sciences Aichi, Japan)
Akiyama, E.
(Tokyo Astronomical Observatory Mitaka, Japan)
Abe, L.
(Universite de Nice-Sophia Antipolis Valbonne, France)
Brandner, W.
(Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Brandt, T. D.
(Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Carson, J.
(Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Egner, S.
(Subaru Telescope Hilo, HI, United States)
Feldt, M.
(Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
Goto, M.
(Ludwig-Maximilians-Univ. Munich, Germany)
Grady, C.
(Eureka Scientific, Inc. Laurel, MD, United States)
Guyon, O.
(Subaru Telescope Hilo, HI, United States)
Hayano, Y.
(Subaru Telescope Hilo, HI, United States)
Hayashi, M.
(Tokyo Astronomical Observatory Mitaka, Japan)
Hayashi, S.
(Subaru Telescope Hilo, HI, United States)
Henning, T.
(Max-Planck-Inst. fuer Astronomie Heidelberg, Germany)
McElwain, M.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Hodapp, K.
(Hawaii Univ. Hilo, HI, United States)
Date Acquired
April 11, 2017
Publication Date
September 26, 2016
Publication Information
Publication: Astronomy & Astrophysics
Volume: 593
Issue: A73
ISSN: 0004-6361
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN41486
Funding Number(s)
CONTRACT_GRANT: NNG16PX39P
Distribution Limits
Public
Copyright
Other
Keywords
high-contrast angular differential imaging (ADI)
azimuthal direction
polarimetric images