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NEBULA DUST: PRIMITIVE GRAIN AGGREGATES OR RECONDENSED?

NEBULA DUST: PRIMITIVE GRAIN AGGREGATES OR RECONDENSED?. Bo Gustafson. Collaborators: Ashley Espy, Univ. of Florida Ludmilla Kolokolova, Univ. of Maryland Yu-Lin Xu, NASA/JSC. PRIMITIVE GRAIN AGGREGATES “COMETARY?”. RECONDENSED “ASTEROIDAL-ZODIACAL?”.

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NEBULA DUST: PRIMITIVE GRAIN AGGREGATES OR RECONDENSED?

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  1. NEBULA DUST: PRIMITIVE GRAIN AGGREGATES OR RECONDENSED? Bo Gustafson Collaborators: Ashley Espy, Univ. of Florida Ludmilla Kolokolova, Univ. of Maryland Yu-Lin Xu, NASA/JSC

  2. PRIMITIVE GRAIN AGGREGATES “COMETARY?”

  3. RECONDENSED “ASTEROIDAL-ZODIACAL?”

  4. THE MICROWAVE ANALOGUE LABORATORY AT THE UF

  5. Silicate and organics in Visual = Plastics in Microwave ADVANTAGES / LIMITATIONS - Analogue materials are grey - One particle, one geometry at a time - Scaling = NO APPROXIMATION - Systematic Investigations

  6. Color through Red and Blue Filters Color Scattering Angle [Degrees] Blue color is usually not observed. Intensity Scattering Angle [Degrees]

  7. Color through Red and Blue Filters Color Scattering Angle [Degrees] Denser = redder. Dust aggregates need not be dense or very large for interaction to be important Intensity Scattering Angle [Degrees]

  8. HOW COLOR IS CREATED: INTERACTION VOLUME DEPENDS ON WAVELENGTH Denser = redder. Dust aggregates need not be dense or very large for interaction to be important 1 micron

  9. OBSERVED Polarimetric color for cometary dust is red but blue for zodiacal light. Polarization through Red and Blue Filters Polarimetric Color Scattering Angle [Degrees] Polarization Scattering Angle [Degrees]

  10. OBSERVED Can be cometary but not Zodiacal Polarimetric color for cometary dust is red but blue for zodiacal light. Polarization through Red and Blue Filters Polarimetric Color Scattering Angle [Degrees] Polarization Scattering Angle [Degrees]

  11. OBSERVED Color for cometary dust and zodiacal dust is mostly red. Color Scattering Angle [Degrees] Intensity Scattering Angle [Degrees]

  12. OBSERVED Color for cometary dust and zodiacal dust is mostly red. Color Scattering Angle [Degrees] Intensity Larger = redder. Scattering Angle [Degrees]

  13. Polarimetric Color Scattering Angle [Degrees] Polarization Still looks like cometary dust (red) Scattering Angle [Degrees]

  14. OBSERVED Color for cometary dust and zodiacal dust is mostly red. Color Scattering Angle [Degrees] Intensity Scattering Angle [Degrees]

  15. OBSERVED Color for cometary dust and zodiacal dust is mostly red. Color Scattering Angle [Degrees] Intensity Look redder Scattering Angle [Degrees]

  16. OBSERVED Polarimetric color for cometary dust is red but blue for zodiacal light. Polarimetric Color Scattering Angle [Degrees] Polarization Scattering Angle [Degrees]

  17. OBSERVED Polarimetric color for cometary dust is red but blue for zodiacal light. Polarimetric Color Scattering Angle [Degrees] Polarization Look bluer Scattering Angle [Degrees]

  18. “Comet” aggregate 1.0 Sphere 0.1 1.4 1.6 1.0 1.2 280 K isotherm [AU] 0.01

  19. CONCLUSIONS - Interactions inside aggregates generate colors - Large aggregates can behave as though they were made of larger substructures than they really are. - “Asteroid” / “comet” particles differences in polarimetric color - “Asteroid” / “comet” particles trends are as observed • Micron scale structure in aggregates may preserve memory of aggregation processes

  20. OBSERVED Color for cometary dust and zodiacal dust is mostly red. Color Scattering Angle [Degrees] Intensity Look redder Scattering Angle [Degrees]

  21. OBSERVED Polarimetric color for cometary dust is red but blue for zodiacal light. Polarimetric Color Scattering Angle [Degrees] Polarization Scattering Angle [Degrees]

  22. OBSERVED Polarimetric color for cometary dust is red but blue for zodiacal light. Polarimetric Color Scattering Angle [Degrees] Polarization Scattering Angle [Degrees]

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