Search

Your search keyword '"Doll, Ryan"' showing total 3 results
Start Over Author "Doll, Ryan" Topic interplanetary dust
3 results on '"Doll, Ryan"'

1. Evidence for interstellar origin of seven dust particles collected by the Stardust spacecraft

Author

Westphal, Andrew J., Rhonda Stroud, Bechtel, Hans A., Brenker, Frank E., Butterworth, Anna L., Flynn, George J., Frank, David R., Gainsforth, Zack, Hillier, Jon K., Postberg, Frank, Simionovici, Alexandre S., Sterken, Veerle J., Nittler, Larry R., Allen, Carlton, Anderson, David, Ansari, Asna, Bajt, Sasa, Bastien, Ron K., Bassim, Nabil, Bridges, John, Brownlee, Donald E., Burchell, Mark, Burghammer, Manfred, Changela, Hitesh, Cloetens, Peter, Davis, Andrew M., Doll, Ryan, Floss, Christine, Gruen, Eberhard, Heck, Philipp R., Hoppe, Peter, Hudson, Bruce, Huth, Joachim, Kearsley, Anton, King, Ashley J., Lai, Barry, Leitner, Jan, Lemelle, Laurence, Leonard, Ariel, Leroux, Hugues, Lettieri, Robert, Marchant, William, Ogliore, Ryan, Ong, Wei Jia, Price, Mark C., Sandford, Scott A., Tresseras, Juan-Angel Sans, Schmitz, Sylvia, Schoonjans, Tom, Schreiber, Kate, Silversmit, Geert, Sole, Vicente A., Srama, Ralf, Stadermann, Frank, Stephan, Thomas, Stodolna, Julien, Sutton, Stephen, Trieloff, Mario, Tsou, Peter, Tyliszczak, Tolek, Vekemans, Bart, Vincze, Laszlo, Korff, Joshua, Wordsworth, Naomi, Zevin, Daniel, Zolensky, Michael E., Stardust Home, Dusters, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), University of California [Berkeley] (UC Berkeley), University of California (UC), Naval Research Laboratory (NRL), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Goethe-University Frankfurt am Main, State University of New York at Plattsburgh (SUNY Plattsburgh), State University of New York (SUNY), NASA Johnson Space Center (JSC), NASA, University of Heidelberg, Medical Faculty, Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), University of Stuttgart, Carnegie Institution for Science, Field Museum of Natural History [Chicago, USA], Deutsches Elektronen-Synchrotron [Hamburg] (DESY), University of Leicester, University of Washington [Seattle], University of Kent [Canterbury], Universiteit Gent = Ghent University (UGENT), The University of New Mexico [Albuquerque], European Synchrotron Radiation Facility (ESRF), University of Chicago, Washington University in Saint Louis (WUSTL), Max-Planck-Institut für Kernphysik (MPIK), Max-Planck-Gesellschaft, International Space Science Institute [Bern] (ISSI), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), University of Hawai‘i [Mānoa] (UHM), NASA Ames Research Center (ARC), University of Illinois [Chicago] (UIC), University of Illinois System, Argonne National Laboratory [Lemont] (ANL), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Inconnu, National Aeronautics & Space Administration (NASA), and United States Department of Energy (DOE)

Subjects
GRAINS, IMPACTS, Solar System, RETURN, Comet dust, Astrophysics::High Energy Astrophysical Phenomena, Dust particles, COMET 81P/WILD 2, Astrophysics, WILD-2, Astrobiology, EVENTS, Interplanetary dust cloud, SIZE DISTRIBUTION, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics, Cosmic dust, INTERPLANETARY DUST, Physics, Multidisciplinary, Spacecraft, business.industry, AEROGEL, WIND, Debris, 13. Climate action, [SDU]Sciences of the Universe [physics], Astrophysics::Earth and Planetary Astrophysics, business, Earth (classical element)
Abstract

Can you spot a speck of space dust? NASA's Stardust spacecraft has been collecting cosmic dust: Aerogel tiles and aluminum foil sat for nearly 200 days in the interstellar dust stream before returning to Earth. Citizen scientists identified most of the 71 tracks where particles were caught in the aerogel, and scanning electron microscopy revealed 25 craterlike features where particles punched through the foil. By performing trajectory and composition analysis, Westphal et al. report that seven of the particles may have an interstellar origin. These dust particles have surprisingly diverse mineral content and structure as compared with models of interstellar dust based on previous astronomical observations. Science , this issue p. 786

Published
2014
Full Text
View/download PDF

2. Stardust Interstellar Preliminary Examination III: Infrared spectroscopic analysis of interstellar dust candidates.

Author

Bechtel, Hans A., Flynn, George J., Allen, Carlton, Anderson, David, Ansari, Asna, Bajt, Saša, Bastien, Ron K., Bassim, Nabil, Borg, Janet, Brenker, Frank E., Bridges, John, Brownlee, Donald E., Burchell, Mark, Burghammer, Manfred, Butterworth, Anna L., Changela, Hitesh, Cloetens, Peter, Davis, Andrew M., Doll, Ryan, and Floss, Christine

Subjects
INTERPLANETARY dust, INFRARED spectroscopy, DUST collectors (Machinery), ORGANIC compounds, FOURIER transform infrared spectroscopy, AEROGELS, X-ray fluorescence
Abstract

Under the auspices of the Stardust Interstellar Preliminary Examination, picokeystones extracted from the Stardust Interstellar Dust Collector were examined with synchrotron Fourier transform infrared ( FTIR) microscopy to establish whether they contained extraterrestrial organic material. The picokeystones were found to be contaminated with varying concentrations and speciation of organics in the native aerogel, which hindered the search for organics in the interstellar dust candidates. Furthermore, examination of the picokeystones prior to and post X-ray microprobe analyses yielded evidence of beam damage in the form of organic deposition or modification, particularly with hard X-ray synchrotron X-ray fluorescence. From these results, it is clear that considerable care must be taken to interpret any organics that might be in interstellar dust particles. For the interstellar candidates examined thus far, however, there is no clear evidence of extraterrestrial organics associated with the track and/or terminal particles. However, we detected organic matter associated with the terminal particle in Track 37, likely a secondary impact from the Al-deck of the sample return capsule, demonstrating the ability of synchrotron FTIR to detect organic matter in small particles within picokeystones from the Stardust interstellar dust collector. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

3. Stardust Interstellar Preliminary Examination XI: Identification and elemental analysis of impact craters on Al foils from the Stardust Interstellar Dust Collector.

Author

Stroud, Rhonda M., Allen, Carlton, Ansari, Asna, Anderson, David, Bajt, Saša, Bassim, Nabil, Bastien, Ron S., Bechtel, Hans A., Borg, Janet, Brenker, Frank E., Bridges, John, Brownlee, Donald E., Burchell, Mark, Burghammer, Manfred, Butterworth, Anna L., Changela, Hitesh, Cloetens, Peter, Davis, Andrew M., Doll, Ryan, and Floss, Christine

Subjects
INTERPLANETARY dust, IMPACT craters, ALUMINUM foil, DUST collectors (Machinery), SCANNING electron microscopy, AUGER electron spectroscopy
Abstract

The Stardust Interstellar Preliminary Examination team analyzed thirteen Al foils from the NASA Stardust interstellar collector tray in order to locate candidate interstellar dust (ISD) grain impacts. Scanning electron microscope ( SEM) images reveal that the foils possess abundant impact crater and crater-like features. Elemental analyses of the crater features, with Auger electron spectroscopy, SEM-based energy dispersive X-ray ( EDX) spectroscopy, and scanning transmission electron microscope-based EDX spectroscopy, demonstrate that the majority are either the result of impacting debris fragments from the spacecraft solar panels, or intrinsic defects in the foil. The elemental analyses also reveal that four craters contain residues of a definite extraterrestrial origin, either as interplanetary dust particles or ISD particles. These four craters are designated level 2 interstellar candidates, based on the crater shapes indicative of hypervelocity impacts and the residue compositions inconsistent with spacecraft debris. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results