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The Peculiar Debris Disk of HD 111520 as Resolved by the Gemini Planet Imager

Draper, Zachary H. and Patel, Rahul (2016) The Peculiar Debris Disk of HD 111520 as Resolved by the Gemini Planet Imager. Astrophysical Journal, 826 (2). Art. No. 147. ISSN 0004-637X.

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Using the Gemini Planet Imager, we have resolved the circumstellar debris disk around HD 111520 at a projected range of ~30–100 AU in both total and polarized H-band intensity. The disk is seen edge-on at a position angle of 165° along the spine of emission. A slight inclination and asymmetric warp are covariant and alter the interpretation of the observed disk emission. We employ three point-spread function subtraction methods to reduce the stellar glare and instrumental artifacts to confirm that there is a roughly 2:1 brightness asymmetry between the NW and SE extension. This specific feature makes HD 111520 the most extreme example of asymmetric debris disks observed in scattered light among similar highly inclined systems, such as HD 15115 and HD 106906. We further identify a tentative localized brightness enhancement and scale height enhancement associated with the disk at ~40 AU away from the star on the SE extension. We also find that the fractional polarization rises from 10% to 40% from 0.”5 to 0.”8 from the star. The combination of large brightness asymmetry and symmetric polarization fraction leads us to believe that an azimuthal dust density variation is causing the observed asymmetry.

Item Type:Article
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URLURL TypeDescription Paper
Draper, Zachary H.0000-0002-1834-3496
Patel, Rahul0000-0002-5025-6827
Additional Information:© 2016 The American Astronomical Society. Received 2016 March 4; revised 2016 May 6; accepted 2016 May 8; published 2016 July 27. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation (NSF) on behalf of the Gemini partnership: the NSF (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil), and Ministerio de Ciencia, Tecnología e Inn. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2012.1.00688.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. Z.H.D. and B.C.M. acknowledge a Discovery Grant and Accelerator Supplement from the Natural Science and Engineering Research Council of Canada. Supported by NSF grants AST-0909188, AST-1313718 (J.R.G., J.J.W., P.G.K.), AST-141378 (G.D., M.F.), and AST-1411868 (K.F., J.L.P., A.R., K.W.D.). Supported by NASA grants NNX15AD95G/NEXSS, NNX14AJ80G, and NNX11AD21G (J.R.G., J.J.W., P.G.K.). 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 (S.M.A.). Facility: Gemini:South - Gemini South Telescope.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Natural Science and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Department of Energy (DOE)DE-AC52-07NA27344
Issue or Number:2
Record Number:CaltechAUTHORS:20160729-145532348
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Official Citation:Zachary H. Draper et al 2016 ApJ 826 147
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69329
Deposited By: Tony Diaz
Deposited On:29 Jul 2016 23:09
Last Modified:09 Mar 2020 13:18

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