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Browsing by Author "Peplowski, Patrick N."

Browsing by Author "Peplowski, Patrick N."

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  • Analysis of MESSENGER Gamma-Ray Spectrometer data from the Mercury flybys 
    Rhodes, Edgar A.; Evans, Larry G.; Nittler, Larry R.; Starr, Richard D.; Sprague, Ann L.; Lawrence, David J.; McCoy, Timothy J.; Stockstill-Cahill, Karen R.; Goldsten, John O.; Peplowski, Patrick N.; Hamara, David K.; Boynton, William V.; Solomon, Sean C. (2011)
    [alpha]bstract<br/>During its three flybys of Mercury, the MESSENGER spacecraft made the first detection of gamma-ray emission from the planet&#39;s surface. With a closest approach distance of ~200 km, the flybys provided ...
  • Chlorine on the Surface of Mercury: MESSENGER Gamma-Ray Measurements and Implications for the Planet s Formation and Evolution 
    Evans, Larry G.; Peplowski, Patrick N.; McCubbin, Francis M.; McCoy, Timothy J.; Nittler, Larry R.; Zolotov, Mikhail Yu; Ebel, Denton S.; Lawrence, David J.; Starr, Richard D.; Weider, Shoshana Z.; Solomon, Sean C. (2015)
    Orbital measurements obtained by the MESSENGER Gamma-Ray Spectrometer have been analyzed to determine the surface abundance of chlorine in Mercury s northern hemisphere. The derived Cl/Si mass ratio is 0.0057 ± 0.001, which ...
  • Compositional terranes on Mercury: Information from fast neutrons 
    Lawrence, David J.; Peplowski, Patrick N.; Beck, Andrew W.; Feldman, William C.; Frank, Elizabeth A.; McCoy, Timothy J.; Nittler, Larry R.; Solomon, Sean C. (2017)
    We report measurements of the flux of fast neutrons at Mercury from 20ºS to the north pole. On the basis of neutron transport simulations and remotely sensed elemental compositions, cosmic-ray-induced fast neutrons are ...
  • Compositional variability on the surface of 4 Vesta revealed through GRaND measurements of high-energy gamma rays 
    Peplowski, Patrick N.; Lawrence, David J.; Prettyman, Thomas H.; Yamashita, Naoyuki; Bazell, Dave; Feldman, William C.; Le Corre, Lucille; McCoy, Timothy J.; Reddy, Vishnu; Reedy, Robert C.; Russell, Chris T.; Toplis, Michael J. (2013)
    Measurements of the high-energy gamma-ray flux emanating from asteroid 4 Vesta by the Dawn Gamma-Ray and Neutron Detector (GRaND) have revealed variability in the near-surface elemental composition of the Vestan surface. ...
  • Constraints on the abundance of carbon in near-surface materials on Mercury: Results from the MESSENGER Gamma-Ray Spectrometer 
    Peplowski, Patrick N.; Lawrence, David J.; Evans, Larry G.; Klima, Rachel L.; Blewett, David T.; Goldsten, John O.; Murchie, Scott L.; McCoy, Timothy J.; Nittler, Larry R.; Solomon, Sean C.; Starr, Richard D.; Weider, Shoshana Z. (2015)
    Mercury&#39;s low surface reflectance and the low surface abundances of iron and titanium have led to the suggestion that carbon (C) may serve as the dominant darkening agent on Mercury&#39;s surface. Estimates of the ...
  • Deciphering Redox State for a Metal-Rich World 
    McCoy, Timothy J.; Dibb, Steven D.; Peplowski, Patrick N.; Maurel, Clara; Bercovici, Hannah L.; Corrigan, Catherine M.; Bell, James F.; Weiss, Benjamin P.; Lawrence, David J.; Wenkert, Daniel D.; Prettyman, Thomas H.; Elkins-Tanton, Lindy (2022)
    The Psyche mission's Oxidation-Reduction Working Group is focused on understanding, determining, and applying the redox state of (16) Psyche to understand the origin of a metal-rich world. The oxidation-reduction state of ...
  • Distinguishing the Origin of Asteroid (16) Psyche 
    Elkins-Tanton, Linda; Asphaug, Erik; Bell, James F.; Bierson, Carver J.; Bills, Bruce G.; Bottke, William F.; Courville, Samuel W.; Dibb, Steven D.; Jun, Insoo; Lawrence, David J.; Marchi, Simone; McCoy, Timothy J.; Merayo, Jose M. G.; Oran, Rona; O'Rourke, Joseph G.; Park, Ryan S.; Peplowski, Patrick N.; Prettyman, Thomas H.; Raymond, Carol A.; Weiss, Benjamin P.; Wieczorek, Mark A.; Zuber, Maria T. (2022)
    The asteroid (16) Psyche may be the metal-rich remnant of a differentiated planetesimal, or it may be a highly reduced, metal-rich asteroidal material that never differentiated. The NASA Psyche mission aims to determine ...
  • The distribution and origin of smooth plains on Mercury 
    Denevi, Brett W.; Ernst, Carolyn M.; Meyer, Heather M.; Robinson, Mark S.; Murchie, Scott L.; Whitten, Jennifer L.; Head, James W.; Watters, Thomas R.; Solomon, Sean C.; Ostrach, Lilian R.; Chapman, Clark R.; Byrne, Paul K.; Klimczak, Christian; Peplowski, Patrick N. (2013)
  • Enhanced sodium abundance in Mercury's north polar region revealed by the MESSENGER Gamma-Ray Spectrometer 
    Peplowski, Patrick N.; Evans, Larry G.; Stockstill-Cahill, Karen; Lawrence, David J.; Goldsten, John O.; McCoy, Timothy J.; Nittler, Larry R.; Solomon, Sean C.; Sprague, Ann L.; Starr, Richard D.; Weider, Shoshana Z. (2014)
    Abstract MESSENGER Gamma-Ray Spectrometer measurements demonstrate that the abundance of Na varies across the surface of Mercury. The maximum Na/Si abundance ratio of 0.20 ± 0.03 by weight (~5 wt% Na) is observed at high ...
  • Evidence from MESSENGER for sulfur- and carbon-driven explosive volcanism on Mercury 
    Weider, Shoshana Z.; Nittler, Larry R.; Murchie, Scott L.; Peplowski, Patrick N.; McCoy, Timothy J.; Kerber, Laura; Klimczak, Christian; Ernst, Carolyn M.; Goudge, Timothy A.; Starr, Richard D.; Izenberg, Noam R.; Klima, Rachel L.; Solomon, Sean C. (2016)
    Targeted MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) X-Ray Spectrometer measurements of Mercury&#39;s largest identified pyroclastic deposit are combined with neutron and reflectance spectroscopy ...
  • Geochemistry, mineralogy, and petrology of boninitic and komatiitic rocks on the mercurian surface: Insights into the mercurian mantle 
    Vander Kaaden, Kathleen E.; McCubbin, Francis M.; Nittler, Larry R.; Peplowski, Patrick N.; Weider, Shoshana Z.; Frank, Elizabeth A.; McCoy, Timothy J. (2017)
    Orbital data from the MESSENGER mission to Mercury have facilitated a new view of the planet&#39;s structure, chemical makeup, and diverse surface, and have confirmed Mercury&#39;s status as a geochemical endmember among ...
  • Igneous lithologies on asteroid (4) Vesta mapped using gamma-ray and neutron data 
    Beck, Andrew W.; Lawrence, David J.; Peplowski, Patrick N.; Viviano-Beck, Christina; Prettyman, Thomas H.; McCoy, Timothy J.; McSween Jr, Harry Y.; Yamashita, Naoyuki (2017)
    We use data collected by the Dawn Gamma-Ray and Neutron Detector (GRaND) at Vesta to map compositions corresponding to nearly pure igneous lithologies in the howardite, eucrite, diogenite (HED) meteorite clan (samples ...
  • A Low O/Si Ratio on the Surface of Mercury: Evidence for Silicon Smelting? 
    McCubbin, Francis M.; Vander Kaaden, Kathleen E.; Peplowski, Patrick N.; Bell, Aaron S.; Nittler, Larry R.; Boyce, Jeremy W.; Evans, Larry G.; Keller, Lindsay P.; Elardo, Stephen M.; McCoy, Timothy J. (2017)
    Data from the Gamma-Ray Spectrometer (GRS) that flew on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging spacecraft indicate that the O/Si weight ratio of Mercury&#39;s surface is 1.2 ± 0.1. This value is ...
  • Major-element abundances on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer 
    Evans, Larry G.; Peplowski, Patrick N.; Rhodes, Edgar A.; Lawrence, David J.; McCoy, Timothy J.; Nittler, Larry R.; Solomon, Sean C.; Sprague, Ann L.; Stockstill-Cahill, Karen R.; Starr, Richard D.; Weider, Shoshana Z.; Boynton, William V.; Hamara, David K.; Goldsten, John O. (2012)
    Orbital gamma-ray measurements obtained by the MESSENGER spacecraft have been analyzed to determine the abundances of the major elements Al, Ca, S, Fe, and Na on the surface of Mercury. The Si abundance was determined and ...
  • Neutron absorption constraints on the composition of 4 Vesta 
    Prettyman, Thomas H.; Mittlefehldt, David W.; Yamashita, Naoyuki; Beck, Andrew W.; Feldman, William C.; Hendricks, John S.; Lawrence, David J.; McCoy, Timothy J.; McSween, Harry Y.; Peplowski, Patrick N.; Reedy, Robert C.; Toplis, Michael J.; Le Corre, Lucille; Mizzon, Hugau; Reddy, Vishnu; Titus, Timothy N.; Raymond, Carol A.; Russell, Christopher T. (2013)
    Global maps of the macroscopic thermal neutron absorption cross section of Vesta&#39;s regolith by the Gamma Ray and Neutron Detector (GRaND) on board the NASA Dawn spacecraft provide constraints on the abundance and ...
  • Publisher Correction to: Deciphering Redox State for a Metal-Rich World 
    McCoy, Timothy J.; Dibb, Steven D.; Peplowski, Patrick N.; Maurel, Clara; Bercovici, Hannah L.; Corrigan, Catherine M.; Bell, James F.; Weiss, Benjamin P.; Lawrence, David J.; Wenkert, Daniel D.; Prettyman, Thomas H.; Elkins-Tanton, Lindy (2022)
  • Radioactive Elements on Mercury s Surface from MESSENGER: Implications for the Planet s Formation and Evolution 
    Peplowski, Patrick N.; Evans, Larry G.; Hauck, Steven A.; McCoy, Timothy J.; Boynton, William V.; Gillis-Davis, Jeffery J.; Ebel, Denton S.; Goldsten, John O.; Hamara, David K.; Lawrence, David J.; McNutt, Ralph L.; Nittler, Larry R.; Solomon, Sean C.; Rhodes, Edgar A.; Sprague, Ann L.; Starr, Richard D.; Stockstill-Cahill, Karen R. (2011)
    The MESSENGER Gamma-Ray Spectrometer measured the average surface abundances of the radioactive elements potassium (K, 1150 ± 220 parts per million), thorium (Th, 220 ± 60 parts per billion), and uranium (U, 90 ± 20 parts ...
  • Variations in the abundances of potassium and thorium on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer 
    Peplowski, Patrick N.; Lawrence, David J.; Rhodes, Edgar A.; Sprague, Ann L.; McCoy, Timothy J.; Denevi, Brett W.; Evans, Larry G.; Head, James W.; Nittler, Larry R.; Solomon, Sean C.; Stockstill-Cahill, Karen R.; Weider, Shoshana Z. (2012)
    A technique for converting gamma-ray count rates measured by the Gamma-Ray Spectrometer on the MESSENGER spacecraft to spatially resolved maps of the gamma-ray emission from the surface of Mercury is utilized to map the ...

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