An Exo-Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light

Authors

• Bin Ren, Johns Hopkins University
• Élodie Choquet, Laboratoire d'Astrophysique de Marseille
• Marshall D. Perrin, Space Telescope Science Institute
• Gaspard Duchěne, University of California, Berkeley
• John H. Debes, Space Telescope Science Institute
• Laurent Pueyo, Space Telescope Science Institute
• Malena Rice, Yale University
• Christine Chen, Johns Hopkins University
• Glenn Schneider, The University of Arizona
• Thomas M. Esposito, University of California, Berkeley
• Charles A. Poteet, Space Telescope Science Institute
• Jason J. Wang, California Institute of Technology
• S. Mark Ammons, Lawrence Livermore National Laboratory
• Megan Ansdell, University of California, Berkeley
• Pauline Arriaga, University of California, Los Angeles
• Vanessa P. Bailey, Jet Propulsion Laboratory
• Travis Barman, The University of Arizona
• Juan Sebastián Bruzzone, Western University
• Joanna Bulger, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
• Jeffrey Chilcote, University of Notre Dame
• Tara Cotten, University of Georgia
• Robert J. De Rosa, University of California, Berkeley
• Rene Doyon, Institut de Recherche sur les Exoplanètes
• Michael P. Fitzgerald, University of California, Los Angeles
• Katherine B. Follette, Amherst College
• Stephen J. Goodsell, Gemini Observatory
• Benjamin L. Gerard, University of Victoria
• James R. Graham, University of California, Berkeley
• Alexandra Z. Greenbaum, University of Michigan, Ann Arbor
• J. Brendan Hagan, Space Telescope Science Institute
• Pascale Hibon, Gemini ObservatorySouthern Operations Center
• Dean C. Hines, Space Telescope Science Institute
• Kimberly Ward-Duong, Amherst CollegeFollow
• et al, Various Institutions

Document Type

Article

Publication Date

9-1-2019

Publication Title

Astrophysical Journal

Abstract

We 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 ∼ 25 au, centered at ∼46 au) and a halo extending 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°-150° 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.

Keywords

protoplanetary disks, radiative transfer, stars: imaging, stars: individual (HD 191089), techniques: image processing

Volume

882

Issue

1

DOI

https://doi.org/10.3847/1538-4357/ab3403

ISSN

0004637X

Rights

© 2019. The American Astronomical Society.

Version

Version of Record

Recommended Citation

Ren, Bin; Choquet, Élodie; Perrin, Marshall D.; Duchěne, Gaspard; Debes, John H.; Pueyo, Laurent; Rice, Malena; Chen, Christine; Schneider, Glenn; Esposito, Thomas M.; Poteet, Charles A.; Wang, Jason J.; Ammons, S. Mark; Ansdell, Megan; Arriaga, Pauline; Bailey, Vanessa P.; Barman, Travis; Bruzzone, Juan Sebastián; Bulger, Joanna; Chilcote, Jeffrey; Cotten, Tara; De Rosa, Robert J.; Doyon, Rene; Fitzgerald, Michael P.; Follette, Katherine B.; Goodsell, Stephen J.; Gerard, Benjamin L.; Graham, James R.; Greenbaum, Alexandra Z.; Hagan, J. Brendan; Hibon, Pascale; Hines, Dean C.; Ward-Duong, Kimberly; and al, et, "An Exo-Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light" (2019). Astronomy: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/ast_facpubs/118