Astrogeology Science Center

Publications

Filter Total Items: 771
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Year Published: 2018

Morphological indicators of a mascon beneath Ceres' largest crater, Kerwan

Gravity data of Ceres returned by the National Aeronautics and Space Administration's Dawn spacecraft is consistent with a lower density crust of variable thickness overlying a higher density mantle. Crustal thickness variations can affect the long‐term, postimpact modification of impact craters on Ceres. Here we show that the unusual morphology...

Bland, Michael T.; Ermakov, Anton; Raymond, Carol A.; Williams, David A.; Bowling, Tim J.; Preusker, F.; Park, Ryan S.; Marchi, Simone; Castillo-Rogez, Julie C.; Fu, R.R.; Russell, Christopher T.
Bland, M. T., Ermakov, A. I., Raymond, C. A., Williams, D. A., Bowling, T. J., Preusker, F., … Russell, C. T. (2018). Morphological indicators of a mascon beneath Ceres’s largest crater, Kerwan. Geophysical Research Letters, 45, 1297–1304. https://doi.org/10.1002/2017GL075526

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Year Published: 2018

Planetary dune workshop expands to include subaqueous processes

Dune-like structures appear in the depths of Earth’s oceans, across its landscapes, and in the extremities of the solar system beyond. Dunes rise up under the thick dense atmosphere of Venus, and they have been found under the almost unimaginably ephemeral atmosphere of a comet.

Titus, Timothy N.; Bryant, Gerald; Rubin, David M.
Titus, T., D. M. Rubin, and G. Bryant (2018), Planetary dune workshop expands to include subaqueous processes, Eos, 99, https://doi.org/10.1029/2018EO092783. Published on 15 February 2018.

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Year Published: 2018

Revised recommended methods for analyzing crater size-frequency distributions

Impact crater populations crucially help us to understand solar system dynamics, planetary surface histories, and surface modification processes. A single previous effort to standardize how crater data are displayed in graphs, tables, and archives, was in a 1978 NASA report by the Crater Analysis Techniques Working Group, published in 1979 in...

Robbins, Stuart J.; Riggs, Jamie D.; Weaver, Brian P.; Bierhaus, Edward B.; Chapman, Clark R.; Kirchoff, Michelle R.; Singer, Kelsi N.; Gaddis, Lisa
Robbins, S.J., J.D. Riggs, B.P. Weaver, E.B. Bierhaus, C.R. Chapman, M.R. Kirchoff, K.N. Singer and L.R. Gaddis, 2018, Revised Recommended Methods for Analyzing Crater Size-Frequency Distributions, Meteoritics and Planetary Science, 53, Nr 4, 891-931.

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Year Published: 2018

Detecting geothermal anomalies and evaluating LST geothermal component by combining thermal remote sensing time series and land surface model data

This paper explores for the first time the possibilities to use two land surface temperature (LST) time series of different origins (geostationary Meteosat Second Generation satellite data and Noah land surface modelling, LSM), to detect geothermal anomalies and extract the geothermal component of LST, the LSTgt. We hypothesize that in geothermal...

Romaguera, Mireia; Vaughan, R. Greg; Ettema, J.; Izquierdo-Verdiguier, E.; Hecker, C. A.; van der Meer, F.D.

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Year Published: 2018

Viscous relaxation as a prerequisite for tectonic resurfacing on Ganymede: Insights from numerical models of lithospheric extension

Ganymede’s bright terrain formed during a near-global resurfacing event (or events) that produced both heavily tectonized and relatively smooth terrains. The mechanism(s) by which resurfacing occurred on Ganymede (e.g., cryovolcanic or tectonic), and the relationship between the older, dark and the younger, bright terrain are fundamental to...

Bland, Michael T.; McKinnon, William B.

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Year Published: 2018

6th international conference on Mars polar science and exploration: Conference summary and five top questions

We provide a historical context of the International Conference on Mars Polar Science and Exploration and summarize the proceedings from the 6th iteration of this meeting. In particular, we identify five key Mars polar science questions based primarily on presentations and discussions at the conference and discuss the overlap between some of those...

Smith, Isaac B.; Diniega, Serina; Beaty, David W.; Thorsteinsson, Thorsteinn; Becerra, Patricio; Bramson, Ali; Clifford, Stephen M.; Hvidberg, Christine S.; Portyankina, Ganna; Piqueux, Sylvain; Spiga, Aymeric; Titus, Timothy N.
Isaac B. Smith, Serina Diniega, David W. Beaty, Thorsteinn Thorsteinsson, Patricio Becerra, Ali M. Bramson, Stephen M. Clifford, Christine S. Hvidberg, Ganna Portyankina, Sylvain Piqueux, Aymeric Spiga, Timothy N. Titus, 6th international conference on Mars polar science and exploration: Conference summary and five top questions, In Icarus, 2017, , ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2017.06.027.

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Year Published: 2018

The effects of snow and salt on ice table stability in University Valley, Antarctica

The Antarctic Dry Valleys represent a unique environment where it is possible to study dry permafrost overlaying an ice-rich permafrost. In this paper, two opposing mechanisms for ice table stability in University Valley are addressed: i) diffusive recharge via thin seasonal snow deposits and ii) desiccation via salt deposits in the upper soil...

Williams, Kaj; Heldmann, Jennifer L.; McKay, Christopher P.; Mellon, Michael T.
Williams, K., Heldmann, J., Mckay, C., & Mellon, M. (2017). The effects of snow and salt on ice table stability in University Valley, Antarctica. Antarctic Science, 1-12. doi:10.1017/S0954102017000402

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Year Published: 2018

Shaler: in situ analysis of a fluvial sedimentary deposit on Mars

This paper characterizes the detailed sedimentology of a fluvial sandbody on Mars for the first time, and interprets its depositional processes and palaeoenvironmental setting. Despite numerous orbital observations of fluvial landforms on the surface of Mars, ground-based characterization of the sedimentology of such fluvial deposits has not...

Edgar, Lauren A.; Gupta, Sanjeev; Rubin, David M.; Lewis, Kevin W.; Kocurek, Gary A.; Anderson, Ryan; Bell, James F. ; Dromart, Gilles; Edgett, Kenneth S.; Grotzinger, John P.; Hardgrove, Craig; Kah, Linda C.; LeVeille, Richard A.; Malin, Michael C.; Mangold, Nicholas; Milliken, Ralph E.; Minitti, Michelle; Palucis, Marisa C.; Rice, Melissa; Rowland, Scott K.; Schieber, Juergen; Stack, Kathryn M.; Sumner, Dawn Y.; Wiens, Roger C.; Williams, Rebecca M.E.; Williams, Amy J.
Edgar, L. A., Gupta, S., Rubin, D. M., Lewis, K. W., Kocurek, G. A., Anderson, R. B., Bell, J. F., Dromart, G., Edgett, K. S., Grotzinger, J. P., Hardgrove, C., Kah, L. C., Leveille, R., Malin, M. C., Mangold, N., Milliken, R. E., Minitti, M., Palucis, M., Rice, M., Rowland, S. K., Schieber, J., Stack, K. M., Sumner, D. Y., Wiens, R. C., Williams, R. M.E. and Williams, A. J. (2017), Shaler: In situ analysis of a fluvial sedimentary deposit on Mars. Sedimentology. Accepted Author Manuscript. doi:10.1111/sed.12370

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Year Published: 2018

Crater density differences: Exploring regional resurfacing, secondary crater populations, and crater saturation equilibrium on the moon

The global population of lunar craters >20 km in diameter was analyzed by Head et al., (2010) to correlate crater distribution with resurfacing events and multiple impactor populations. The work presented here extends the global crater distribution analysis to smaller craters (5–20 km diameters, n = 22,746). Smaller...

Povilaitis, R. Z.; Robinson, M. S.; van der Bogert, C. H.; Hiesinger, Harald; Meyer, H. M.; Ostrach, Lillian
Povilaitis, R.Z., Robinson, M.S., van der Bogert, C.H., Hiesinger, H., Meyer, H.M., Ostrach, L.R.. Crater density differences: Exploring regional resurfacing, secondary crater populations, and crater saturation equilibrium on the Moon. Planetary and Space Science, in press. https://doi.org/10.1016/j.pss.2017.05.006.

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Year Published: 2017

Effects of lava heating on volatile-rich slopes on Io

The upper crust of Io may be very rich in volatile sulfur and SO2. The surface is also highly volcanically active, and slopes may be warmed by radiant heat from the lava. This is particularly the case in paterae, which commonly host volcanic eruptions and long-lived lava lakes. Paterae slopes are highly variable, but some are greater than 70°. I...

Dundas, Colin M.
Dundas, C. M. Effects of lava heating on volatile-rich slopes on Io. J. Geophys. Res. Planets, 122, 546-559, doi:10.1002/2016JE005177.

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Year Published: 2017

Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water

Recent liquid water flow on Mars has been proposed based on geomorphological features, such as gullies. Recurring slope lineae — seasonal flows that are darker than their surroundings — are candidate locations for seeping liquid water on Mars today, but their formation mechanism remains unclear. Topographical analysis shows that the terminal...

Dundas, Colin M.; McEwen, Alfred S.; Chojnacki, Matthew; Milazzo, Moses; Byrne, Shane; McElwaine, Jim; Urso, Anna
Dundas, C. M., et al. (2017). Granular flows at Recurring Slope Lineae on Mars indicate a limited role for liquid water. Nature Geosci., 10, 903-907, doi:10.1038/s41561-017-0012-5.

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Year Published: 2017

Geologic overview of the Mars Science Laboratory rover mission at the Kimberley, Gale crater, Mars

The Mars Science Laboratory (MSL) Curiosity rover completed a detailed investigation at the Kimberley waypoint within Gale crater from sols 571-634 using its full science instrument payload. From orbital images examined early in the Curiosity mission, the Kimberley region had been identified as a high-priority science target based on its clear...

Rice, Melissa; Gupta, Sanjeev; Treiman, Allan H.; Stack, Kathryn M.; Calef, Fred J.; Edgar, Lauren A.; Grotzinger, John P.; Lanza, Nina L.; Le Deit, Laetitia; Lasue, Jeremie; Siebach, Kirsten L.; Vasavada, Ashwin R.; Wiens, Roger C.; Williams, Josh