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Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A with GPI Polarimetry

Bruzzone, Juan Sebastián and Patel, Rahul (2020) Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A with GPI Polarimetry. Astronomical Journal, 159 (2). Art. No. 53. ISSN 1538-3881. doi:10.3847/1538-3881/ab5d2e.

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We present the first polarimetric detection of the inner disk component around the pre-main-sequence B9.5 star HD 141569A. Gemini Planet Imager H-band (1.65 μm) polarimetric differential imaging reveals the highest signal-to-noise ratio detection of this ring yet attained and traces structure inward to 0.”25 (28 au at a distance of 111 pc). The radial polarized intensity image shows the east side of the disk, peaking in intensity at 0.”40 (44 au) and extending out to 0.”9 (100 au). There is a spiral arm–like enhancement to the south, reminiscent of the known spiral structures on the outer rings of the disk. The location of the spiral arm is coincident with ¹²CO J = 3–2 emission detected by ALMA and hints at a dynamically active inner circumstellar region. Our observations also show a portion of the middle dusty ring at ~220 au known from previous observations of this system. We fit the polarized H-band emission with a continuum radiative transfer Mie model. Our best-fit model favors an optically thin disk with a minimum dust grain size close to the blowout size for this system, evidence of ongoing dust production in the inner reaches of the disk. The thermal emission from this model accounts for virtually all of the far-infrared and millimeter flux from the entire HD 141569A disk, in agreement with the lack of ALMA continuum and CO emission beyond ~100 au. A remaining 8–30 μm thermal excess a factor of ~2 above our model argues for an as-yet-unresolved warm innermost 5–15 au component of the disk.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bruzzone, Juan Sebastián0000-0002-2731-0397
Patel, Rahul0000-0002-5025-6827
Alternate Title:Imaging the 44 AU Kuiper Belt-analogue debris ring around HD 141569A with GPI polarimetry
Additional Information:© 2020 The American Astronomical Society. Received 2018 May 11; revised 2019 November 25; accepted 2019 November 26; published 2020 January 16. We thank our referee for very insightful feedback on the dust considerations in our modeling. This research was supported in part by a Discovery Grant by the Canadian Natural Sciences and Engineering Council (NSERC) to S.M. and NSF grant AST-1413718 (GD). P.K. and J.R.G. are thankful for support from NSF AST-1518332 and NASA NNX15AC89G and NNX15AD95G/NEXSS. J.M. acknowledges support from the NASA through the NASA Hubble Fellowship grant HST-HF2-51414.001 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. This work benefited from NASA's Nexus for Exoplanet System Science (NExSS) research coordination network, sponsored by NASA's Science Mission Directorate. Portions of this work were performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Facility: Gemini:South(GPI) - Gemini South Telescope.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NASA Hubble FellowshipHST-HF2-51414.001
Department of Energy (DOE)DE-AC52-07NA27344
Subject Keywords:Debris disks; Circumstellar disks; Polarimetry; Astronomical techniques; Coronographic imaging; Direct imaging
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Debris disks (363); Circumstellar disks (235); Polarimetry (1278); Astronomical techniques (1684); Coronographic imaging (313); Direct imaging (387)
Record Number:CaltechAUTHORS:20200115-111843911
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Official Citation:Juan Sebastián Bruzzone et al 2020 AJ 159 53
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100737
Deposited By: Tony Diaz
Deposited On:15 Jan 2020 19:40
Last Modified:16 Nov 2021 17:56

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