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Title: An Exo–Kuiper Belt with an Extended Halo around HD 191089 in Scattered Light

Journal Article · · The Astrophysical Journal (Online)
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  1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
  2. Aix-Marseille Univ., Marseille (France); California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  3. Space Telescope Science Institute (STScI), Baltimore, MD (United States)
  4. Univ. of California, Berkeley, CA (United States); Univ. Grenoble-Alpes, Grenoble (France). CNRS Institut de Planetologie et d’Astrophysique (IPAG)
  5. Yale Univ., New Haven, CT (United States)
  6. Space Telescope Science Institute (STScI), Baltimore, MD (United States); Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
  7. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
  8. Univ. of California, Berkeley, CA (United States)
  9. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  10. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  11. Univ. of California, Los Angeles, CA (United States)
  12. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  13. Univ. of Arizona, Tucson, AZ (United States)
  14. Univ. of Western Ontario, London, ON (Canada)
  15. Subaru Telescope, Hilo, HI (United States)
  16. Univ. of Notre Dame, IN (United States)
  17. Univ. of Georgia, Athens, GA (United States)
  18. Univ. of Montreal, QC (Canada)
  19. Amherst College, MA (United States)
  20. Gemini Observatory, Hilo, HI (United States)
  21. Univ. of Victoria, BC (Canada); National Research Council of Canada Herzberg, Victoria, BC (Canada)
  22. Univ. of Michigan, Ann Arbor, MI (United States)
  23. Gemini Observatory, La Serena (Chile)
  24. National Park Service, Fort Collins, CO (United States)
  25. Large Synoptic Survey Telescope, Tucson, AZ (United States)
  26. Univ. of California, Berkeley, CA (United States); Carl Sagan Center, Mountain View, CA (United States). SETI Inst.
  27. Univ. of California, San Diego, CA (United States)
  28. Stanford Univ., CA (United States). Dept. of Physics, Kavli Inst. for Particle Astrophysics and Cosmology
  29. Carl Sagan Center, Mountain View, CA (United States). SETI Inst.
  30. Univ. Grenoble-Alpes, Grenoble (France). CNRS Institut de Planetologie et d’Astrophysique (IPAG)
  31. Univ. of Western Ontario, London, ON (Canada); Stony Brook Univ., NY (United States)
  32. American Geophysical Union, Washington, DC (United States)
  33. University of Côte d'Azur, Nice (France)
  34. American Museum of Natural History (AMNH), New York, NY (United States)
  35. Arizona State Univ., Tempe, AZ (United States)
  36. Monash Univ., Melbourne, VIC (Australia). Monash Centre for Astrophysics (MoCA) and School of Physics and Astronomy
  37. Cornell Univ., Ithaca, NY (United States)
  38. Aix-Marseille Univ., Marseille (France)
  39. Amherst College, MA (United States); Arizona State Univ., Tempe, AZ (United States)
  40. Univ. of California, Santa Cruz, CA (United States)
  41. Leiden Univ. (Netherlands)
  42. Space Telescope Science Institute (STScI), Baltimore, MD (United States) ; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1597222
Report Number(s):
LLNL-JRNL-803460; 1007289; TRN: US2103052
Journal Information:
The Astrophysical Journal (Online), Vol. 882, Issue 1; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (1)

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