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

Bin Ren, Élodie Choquet, Marshall D. Perrin, Gaspard Duchěne, John H. Debes, Laurent Pueyo, Malena Rice, Christine Chen, Glenn Schneider, Thomas M. Esposito, Charles A. Poteet, Jason J. Wang, S. Mark Ammons, Megan Ansdell, Pauline Arriaga, Vanessa P. Bailey, Travis Barman, Juan Sebastián Bruzzone, Joanna Bulger, Jeffrey ChilcoteTara Cotten, Robert J. De Rosa, Rene Doyon, Michael P. Fitzgerald, Katherine B. Follette, Stephen J. Goodsell, Benjamin L. Gerard, James R. Graham, Alexandra Z. Greenbaum, J. Brendan Hagan, Pascale Hibon, Dean C. Hines, Li Wei Hung, Patrick Ingraham, Paul Kalas, Quinn Konopacky, James E. Larkin, Bruce Macintosh, Jérôme Maire, Franck Marchis, Christian Marois, Johan Mazoyer, François Ménard, Stanimir Metchev, Maxwell A. Millar-Blanchaer, Tushar Mittal, Margaret Moerchen, Eric L. Nielsen, Mamadou N'Diaye, Rebecca Oppenheimer, David Palmer, Jennifer Patience, Christophe Pinte, Lisa Poyneer, Abhijith Rajan, Julien Rameau, Fredrik T. Rantakyrö, Jean Baptiste Ruffio, Dominic Ryan, Dmitry Savransky, Adam C. Schneider, Anand Sivaramakrishnan, Inseok Song, Rémi Soummer, Christopher Stark, Sandrine Thomas, Arthur Vigan, J. Kent Wallace, Kimberly Ward-Duong, Sloane Wiktorowicz, Schuyler Wolff, Marie Ygouf, Colin Norman

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8 Citations (Scopus)

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.

Original languageEnglish
Article number64
Number of pages24
JournalThe Astrophysical Journal
Volume882
Issue number1
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

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

Cite this

Ren, B., Choquet, É., Perrin, M. D., Duchěne, G., Debes, J. H., Pueyo, L., Rice, M., Chen, C., Schneider, G., Esposito, T. M., Poteet, C. A., Wang, J. J., Ammons, S. M., Ansdell, M., Arriaga, P., Bailey, V. P., Barman, T., Bruzzone, J. S., Bulger, J., ... Norman, C. (2019). An Exo-Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light. The Astrophysical Journal, 882(1), [64]. https://doi.org/10.3847/1538-4357/ab3403