An Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light
AffiliationUniv Arizona, Steward Observ
Univ Arizona, Lunar & Planetary Lab
stars: individual (HD 191089)
techniques: image processing
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PublisherIOP PUBLISHING LTD
CitationBin Ren et al 2019 ApJ 882 64
RightsCopyright © 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis 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 firstname.lastname@example.org.
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.
VersionFinal published version
SponsorsNASA 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]