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Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS

Esposito, Thomas M. and Choquet, Élodie (2018) Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS. Astronomical Journal, 156 (2). Art. No. 47. ISSN 1538-3881.

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We present new high resolution imaging of a light-scattering dust ring and halo around the young star HD 35841. Using spectroscopic and polarimetric data from the Gemini Planet Imager in H-band (1.6 μm), we detect the highly inclined (i = 85°) ring of debris down to a projected separation of ~12 au (~0.”12) for the first time. Optical imaging from HST/STIS shows a smooth dust halo extending outward from the ring to >140 au (>1.”4). We measure the ring's scattering phase function and polarization fraction over scattering angles of 22°–125°, showing a preference for forward scattering and a polarization fraction that peaks at ~30% near the ansae. Modeling of the scattered-light disk indicates that the ring spans radii of ~60–220 au, has a vertical thickness similar to that of other resolved dust rings, and contains grains as small as 1.5 μm in diameter. These models also suggest the grains have a low porosity, are more likely to consist of carbon than astrosilicates, and contain significant water ice. The halo has a surface brightness profile consistent with that expected from grains pushed by radiation pressure from the main ring onto highly eccentric but still bound orbits. We also briefly investigate arrangements of a possible inner disk component implied by our spectral energy distribution models, and speculate about the limitations of Mie theory for doing detailed analyses of debris disk dust populations.

Item Type:Article
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URLURL TypeDescription Paper
Esposito, Thomas M.0000-0002-0792-3719
Choquet, Élodie0000-0002-9173-0740
Additional Information:© 2018 The American Astronomical Society. Received 2018 February 6; revised 2018 June 6; accepted 2018 June 7; published 2018 July 12. The authors wish to thank the anonymous referee for helpful suggestions that improved this manuscript. This work is based in part 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 NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, and Tecnologia e Inovação (Brazil). Based also in part on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555; these observations are associated with program #GO-13381. T.M.E., P.K., and J.R.G. are grateful for support from NSF AST-1518332, NASA NNX15AC89G, and NNX15AD95G/NEXSS. 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 also performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work has made use of data from the European Space Agency (ESA) mission Gaia (, processed by the Gaia Data Processing and Analysis Consortium (DPAC, Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of the SIMBAD and VizieR databases, operated at CDS, Strasbourg, France. Facilities: Gemini:South - Gemini South Telescope, HST (STIS) - , Keck:II (NIRC2) - Software: Gemini Planet Imager Data Pipeline (Perrin et al. 2014, 2016,, pyKLIP (Wang et al. 2015a,, emcee (Foreman-Mackey et al. 2013,, Astropy (The Astropy Collaboration et al. 2018), matplotlib (Hunter 2007; Droettboom et al. 2017), iPython (Pérez & Granger 2007), corner (Foreman-Mackey 2016,
Funding AgencyGrant Number
National Research Council of CanadaUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Ministerio de Ciencia, Tecnología e Innovación ProductivaUNSPECIFIED
Ministério de Ciência, and Tecnologia e InovaçãoUNSPECIFIED
NASANAS 5-26555
Department of Energy (DOE)DE-AC52-07NA27344
Subject Keywords:circumstellar matter – infrared: planetary systems – stars: individual (HD 35841) – techniques: high angular resolution
Record Number:CaltechAUTHORS:20180713-150611260
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Official Citation:Thomas M. Esposito et al 2018 AJ 156 47
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87853
Deposited By: Tony Diaz
Deposited On:13 Jul 2018 22:27
Last Modified:26 Mar 2019 17:13

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