Space Weathering of TNOs: Constraints from Laboratory Experiments on Extraterrestrial Carbons and Analogs

Details Space Weathering of TNOs: Constraints from Laboratory Experiments on Extraterrestrial Carbons and Analogs Space Weathering of TNOs: Constraints from Laboratory Experiments on Extraterrestrial Carbons and Analogs

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p31f..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P31F-06

Physics

[6015] Planetary Sciences: Comets And Small Bodies / Dust, [6017] Planetary Sciences: Comets And Small Bodies / Erosion And Weathering, [6060] Planetary Sciences: Comets And Small Bodies / Radiation And Chemistry, [6285] Planetary Sciences: Solar System Objects / Trans-Neptunian Objects

Scientific paper

Complex organic materials on small outer Solar System icy bodies probably include a primary native component accreted during the formation of planetesimals, and a secondary component that is a by-product of (cosmic and/or solar wind) ion and photon irradiation of simpler C-bearing volatile ices such as CH4, CH3OH, etc. This irradiation-induced processing of surfaces is known as space weathering (SW). Although less abundant than the primary native component, this secondary SW-produced organic component can strongly affect the remote sensing studies of Centaurs and trans-Neptunian objects (TNOs). In fact, SW may play an important role in determining the observed spectral variety of these objects, in particular the low surface albedos and the variety of colors from red to black that are commonly attributed to organic compounds and carbonaceous refractories. In order to de-bias the observations from the SW component and to better constrain these processes, laboratory experiments are needed. Here I will show spectroscopic data of some irradiated laboratory analogs: organic icy residues, soot, and hydrogenated amorphous carbon. These data will be compared with those of some chondritic porous interplanetary dust particles of cometary origin. I will discuss how this comparison can provide interesting inputs and help constraining the origin of TNO organic materials. In particular, I will emphasize the role of Raman spectroscopy in characterizing the structural properties of the analyzed samples, in interpreting the observed heterogeneity of the extraterrestrial carbonaceous component, and in constraining the irradiation dose accumulated before and after the formation of planetesimals.

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