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Your search keyword '"Moragas-Klostermeyer, G. (Georg)"' showing total 2 results
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2 results on '"Moragas-Klostermeyer, G. (Georg)"'

1. Macromolecular organic compounds from the depths of Enceladus

Author

Postberg, F. (Frank), Khawaja, N. (Nozair), Abel, B. (Bernd), Choblet, G. (Gael), Glein, C. R. (Christopher R.), Gudipati, M. S. (Murthy S.), Henderson, B. L. (Bryana L.), Hsu, H.-W. (Hsiang-Wen), Kempf, S. (Sascha), Klenner, F. (Fabian), Moragas-Klostermeyer, G. (Georg), Magee, B. (Brian), Nölle, L. (Lenz), Perry, M. (Mark), Reviol, R. (René), Schmidt, J. (Jürgen), Srama, R. (Ralf), Stolz, F. (Ferdinand), Tobie, G. (Gabriel), Trieloff, M. (Mario), Waite, J. H. (J. Hunter), Postberg, F. (Frank), Khawaja, N. (Nozair), Abel, B. (Bernd), Choblet, G. (Gael), Glein, C. R. (Christopher R.), Gudipati, M. S. (Murthy S.), Henderson, B. L. (Bryana L.), Hsu, H.-W. (Hsiang-Wen), Kempf, S. (Sascha), Klenner, F. (Fabian), Moragas-Klostermeyer, G. (Georg), Magee, B. (Brian), Nölle, L. (Lenz), Perry, M. (Mark), Reviol, R. (René), Schmidt, J. (Jürgen), Srama, R. (Ralf), Stolz, F. (Ferdinand), Tobie, G. (Gabriel), Trieloff, M. (Mario), and Waite, J. H. (J. Hunter)

Abstract

Saturn’s moon Enceladus harbours a global water ocean¹, which lies under an ice crust and above a rocky core². Through warm cracks in the crust³ a cryo-volcanic plume ejects ice grains and vapour into space⁴–⁷ that contain materials originating from the ocean⁸,⁹. Hydrothermal activity is suspected to occur deep inside the porous core¹⁰–¹², powered by tidal dissipation¹³. So far, only simple organic compounds with molecular masses mostly below 50 atomic mass units have been observed in plume material⁶,¹⁴,¹⁵. Here we report observations of emitted ice grains containing concentrated and complex macromolecular organic material with molecular masses above 200 atomic mass units. The data constrain the macromolecular structure of organics detected in the ice grains and suggest the presence of a thin organic-rich film on top of the oceanic water table, where organic nucleation cores generated by the bursting of bubbles allow the probing of Enceladus’ organic inventory in enhanced concentrations.

Published
2018

2. In situ collection of dust grains falling from Saturn’s rings into its atmosphere

Author

Hsu, H.-W. (Hsiang-Wen), Schmidt, J. (Jürgen), Kempf, S. (Sascha), Postberg, F. (Frank), Moragas-Klostermeyer, G. (Georg), Seiß, M. (Martin), Hoffmann, H. (Holger), Burton, M. (Marcia), Ye, S. (ShengYi), Kurth, W. S. (William S.), Horányi, M. (Mihály), Khawaja, N. (Nozair), Spahn, F. (Frank), Schirdewahn, D. (Daniel), O’Donoghue, J. (James), Moore, L. (Luke), Cuzzi, J. (Jeff), Jones, G. H. (Geraint H.), Srama, R. (Ralf), Hsu, H.-W. (Hsiang-Wen), Schmidt, J. (Jürgen), Kempf, S. (Sascha), Postberg, F. (Frank), Moragas-Klostermeyer, G. (Georg), Seiß, M. (Martin), Hoffmann, H. (Holger), Burton, M. (Marcia), Ye, S. (ShengYi), Kurth, W. S. (William S.), Horányi, M. (Mihály), Khawaja, N. (Nozair), Spahn, F. (Frank), Schirdewahn, D. (Daniel), O’Donoghue, J. (James), Moore, L. (Luke), Cuzzi, J. (Jeff), Jones, G. H. (Geraint H.), and Srama, R. (Ralf)

Abstract

Saturn’s main rings are composed of >95% water ice, and the nature of the remaining few percent has remained unclear. The Cassini spacecraft’s traversals between Saturn and its innermost D ring allowed its cosmic dust analyzer (CDA) to collect material released from the main rings and to characterize the ring material infall into Saturn. We report the direct in situ detection of material from Saturn’s dense rings by the CDA impact mass spectrometer. Most detected grains are a few tens of nanometers in size and dynamically associated with the previously inferred “ring rain.” Silicate and water-ice grains were identified, in proportions that vary with latitude. Silicate grains constitute up to 30% of infalling grains, a higher percentage than the bulk silicate content of the rings.

Published
2018

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