Water ice abundance and CO2 band strength on the saturnian satellite Phoebe from Cassini/VIMS observations
► Using Cassini–VIMS spectra, we map the water ice spatial abundance on Phoebe. ► The measured abundances are 0.1–4% with grain radii between 1 and 10μm. ► We used dirty ice models to better fit Phoebe spectra. ► These models increase the measured spatial abundances by 1.6–12 times. ► We measured an...
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Published in | Icarus (New York, N.Y. 1962) Vol. 220; no. 2; pp. 331 - 338 |
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Language | English |
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Abstract | ► Using Cassini–VIMS spectra, we map the water ice spatial abundance on Phoebe. ► The measured abundances are 0.1–4% with grain radii between 1 and 10μm. ► We used dirty ice models to better fit Phoebe spectra. ► These models increase the measured spatial abundances by 1.6–12 times. ► We measured and mapped the strength of the CO2 band on Phoebe.
We have studied the near-infrared spectrum of the Saturn satellite Phoebe, a distant satellite observed before Cassini’s Saturn orbit insertion, using data from the Visual and Infrared Mapping Spectrometer (VIMS) on the Cassini orbiter. We have done a critical calibration of the dataset that involves careful correction of dark artifacts. We model areally mixed water ice and non-ice (assumed segregated because of the low ∼3% albedo of the non-ice material) for several high and medium resolution observations of Phoebe made near closest approach. Using a Hapke roughness factor of 15°, we find ice abundances from ∼0.1% to over 4%. The ice grain radii vary from 1 to 10μm. These are displayed on a projected map of Phoebe with about 50% coverage (about 33% coverage at better than 5km spatial resolution). Detailed looks at the water ice spectral fits shows that the weak 1.05 and 1.25-μm bands are missing in most of the spectra, implying that the ice endmember is not pure ice, but has a dark material mixed with it that lowers the albedo and suppresses these bands. We made a model of ice contaminated with Phoebe-like dark material showing that a few percent of dark material lowers the albedo to ∼50% and suppresses the bands. The dirty ice model produces better fits to the spectra and implies that the amount of dirty ice is about 1.5 times the amount of pure ice. We have also calculated the CO2 band depth for these same observations and projected the results. The CO2 band depth varies inversely with water ice abundance. |
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AbstractList | ► Using Cassini–VIMS spectra, we map the water ice spatial abundance on Phoebe. ► The measured abundances are 0.1–4% with grain radii between 1 and 10μm. ► We used dirty ice models to better fit Phoebe spectra. ► These models increase the measured spatial abundances by 1.6–12 times. ► We measured and mapped the strength of the CO2 band on Phoebe.
We have studied the near-infrared spectrum of the Saturn satellite Phoebe, a distant satellite observed before Cassini’s Saturn orbit insertion, using data from the Visual and Infrared Mapping Spectrometer (VIMS) on the Cassini orbiter. We have done a critical calibration of the dataset that involves careful correction of dark artifacts. We model areally mixed water ice and non-ice (assumed segregated because of the low ∼3% albedo of the non-ice material) for several high and medium resolution observations of Phoebe made near closest approach. Using a Hapke roughness factor of 15°, we find ice abundances from ∼0.1% to over 4%. The ice grain radii vary from 1 to 10μm. These are displayed on a projected map of Phoebe with about 50% coverage (about 33% coverage at better than 5km spatial resolution). Detailed looks at the water ice spectral fits shows that the weak 1.05 and 1.25-μm bands are missing in most of the spectra, implying that the ice endmember is not pure ice, but has a dark material mixed with it that lowers the albedo and suppresses these bands. We made a model of ice contaminated with Phoebe-like dark material showing that a few percent of dark material lowers the albedo to ∼50% and suppresses the bands. The dirty ice model produces better fits to the spectra and implies that the amount of dirty ice is about 1.5 times the amount of pure ice. We have also calculated the CO2 band depth for these same observations and projected the results. The CO2 band depth varies inversely with water ice abundance. |
Author | Hollenbeck, Emily C. Hansen, Gary B. Stephan, Katrin Shin-White, Eun-Ju Z. Apple, Sean K. |
Author_xml | – sequence: 1 givenname: Gary B. surname: Hansen fullname: Hansen, Gary B. email: ghansen@ess.washington.edu organization: Department of Earth and Space Sciences, University of Washington, Box 351310, Seattle, WA 98195-1310, United States – sequence: 2 givenname: Emily C. surname: Hollenbeck fullname: Hollenbeck, Emily C. organization: University of Washington, United States – sequence: 3 givenname: Katrin surname: Stephan fullname: Stephan, Katrin organization: Deutschland für Luft- und Raumfahrt, Institute of Planetary Research, Germany – sequence: 4 givenname: Sean K. surname: Apple fullname: Apple, Sean K. organization: University of Washington, United States – sequence: 5 givenname: Eun-Ju Z. surname: Shin-White fullname: Shin-White, Eun-Ju Z. organization: University of Washington, United States |
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CitedBy_id | crossref_primary_10_1016_j_icarus_2016_03_002 crossref_primary_10_1007_s11214_019_0603_0 crossref_primary_10_1016_j_icarus_2020_113714 crossref_primary_10_3847_1538_3881_aac213 |
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Keywords | Satellites, Composition Spectroscopy Ices, IR spectroscopy Saturn, Satellites Satellites, Surfaces Phoebe Cassini Huygens space probe Infrared spectroscopy Roughness Abundance Ice Orbits Saturn planet Albedo Near infrared spectrum Saturn satellite Models Solar system Corrections |
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Snippet | ► Using Cassini–VIMS spectra, we map the water ice spatial abundance on Phoebe. ► The measured abundances are 0.1–4% with grain radii between 1 and 10μm. ► We... |
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SubjectTerms | Astronomy Earth, ocean, space Exact sciences and technology Ices, IR spectroscopy Satellites, Composition Satellites, Surfaces Saturn, Satellites Solar system Spectroscopy |
Title | Water ice abundance and CO2 band strength on the saturnian satellite Phoebe from Cassini/VIMS observations |
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