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dc.contributor.authorSchneider, Glenn
dc.contributor.authorBarman, Travis
dc.date.accessioned2019-10-09T17:22:34Z
dc.date.available2019-10-09T17:22:34Z
dc.date.issued2019-09-04
dc.identifier.citationBin Ren et al 2019 ApJ 882 64en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab3403
dc.identifier.urihttp://hdl.handle.net/10150/634699
dc.description.abstractWe have obtained Hubble Space Telescope STIS and NICMOS and Gemini/GPI scattered-light images of the HD 191089 debris disk. We identify two spatial components: a ring resembling the Kuiper Belt in radial extent (FWHM similar to 25 au, centered at similar to 46 au) and a halo extending to similar to 640 au. We find that the halo is significantly bluer than the ring, consistent with the scenario that the ring serves as the "birth ring" for the smaller dust in the halo. We measure the scattering phase functions in the 30 degrees -150 degrees scattering-angle range and find that the halo dust is more forward- and backward-scattering than the ring dust. We measure a surface density power-law index of -0.68 +/- 0.04 for the halo, which indicates the slowdown of the radial outward motion of the dust. Using radiative transfer modeling, we attempt to simultaneously reproduce the (visible) total and (near-infrared) polarized intensity images of the birth ring. Our modeling leads to mutually inconsistent results, indicating that more complex models, such as the inclusion of more realistic aggregate particles, are needed.en_US
dc.description.sponsorshipNASA through Hubble Fellowship - STScI [HST-HF2-51355, NAS5-26555]; Australian Research CouncilAustralian Research Council [FT170100040, DP180104235]; NSFNational Science Foundation (NSF) [NNX15AD95G/NEXSS, AST-1413718, AST-1616479]; NASANational Aeronautics & Space Administration (NASA) [NAS5-26555, HST-AR-12652, NNX15AD95G/NEXSS, HST-GO-11136, HST-GO-13855, HST-GO-13331, NNX15AC89G, NSF AST-1518332]; STScI Director's Discretionary Research funds; Legacy Archive project, "A Legacy Archive PSF Library And Circumstellar Environments (LAPLACE) Investigation" [HST-AR-11279]en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectprotoplanetary disksen_US
dc.subjectradiative transferen_US
dc.subjectstars: imagingen_US
dc.subjectstars: individual (HD 191089)en_US
dc.subjecttechniques: image processingen_US
dc.titleAn Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Lighten_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume882
dc.source.issue1
dc.source.beginpage64
refterms.dateFOA2019-10-09T17:22:35Z


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