Department of Astronomy Center for Radiophysics & Space Research

Alexander Hayes

Associate Professor of Astronomy
Alexander Hayes
Specialty Areas:

Planetary Science

Research Projects

Cassini Mission to Saturn, Cassini RADAR observations of Titan's Surface, Icy Satellite Surfaces, Titan's Hydrocarbon Cycle, Mars Exploration Rover Mission,Interpretation and Correlation of Martian Stratigraphy, Planetary Surface Processes, Temperature-Dependent Spectroscopy of Hydrated Minerals, and Instrument Development.


Hayes uses spacecraft-based remote sensing to study the properties of planetary surfaces, their interactions with the interior, and if present, atmosphere.Recently, he has focused on studying the coupling of surface, subsurface, and atmospheric processes on Titan and Mars. Titan is the only planetary body,besides Earth, that supports standing bodies of liquid on its surface. Hayes uses the Cassini RADAR to study and model surface morphologies on icy satellites, including the distribution and evolution of Titan's hydrocarbon lakes and seas. Using data from the Mars Exploration Rovers and Mars Reconnaissance Orbiter, he is also interested studying the depositional and diagenetic history of early Mars. The geometry, scale, and distribution of sedimentary structures on Mars is strikingly similar to deposits found on Earth, allowing the methods and principles of terrestrial-based sedimentologyto be utilized on Martian Analogs.

Selected Publications:

Full list and C.V. available here.

A. G. Hayes, J. Grotzinger, L. Edgar, W. Watters, S. Squyres, and J. Sohl-Dickstien. Reconstruction of Ancient Eolian Bed Forms and Paleo-Currents from Cross-Bedded Strata at Merdiani Planum, Mars. Journal of Geophysical Research: Planets, Vol. 116, E00F21, April 2011.

A. G. Hayes, O. Aharonson, J. Lunine, H. Zebker, L. Wye, R. Lorenz, E. Turtle, P. Paillou,G. Mitri, S. Wall, E R. Stofan, C. Elachi, and The Cassini RADAR Team. Transient Surface Liquid in Titan's Polar Regions from Cassini. Icarus, vol. 211, January 2011

A. G. Hayes, A. S. Wolf, O. Aharonson, H. Zebker, R. Lorenz, P. Paillou, S. Wall, and C. Elachi. Bathymetry and Absorptivity of Titan's Ontario Lacus. Journal of Geophysical Research: Planets, Vol. 115, E09009, September 2010.

O. Aharonson, A. G. Hayes, J.I. Lunine, R.D. Lorenz, M.D. Allison, and C. Elachi. An asymmetric distribution of lakes on Titan as a possible consequence of orbital forcing. Nature Geosciences, 2:851-854, November 2009.

A. G. Hayes, O. Aharonson, P. Callahan, C. Elachi, Y. Gim, R. Kirk, K. Lewis, R. Lopes, R. Lorenz, J. Lunine, K. Mitchell, G. Mitri, E. Stofan, and S. Wall. Hydrocarbon lakes on Titan: Distribution and interaction with a porous regolith. Geophysical Research Letters, 35:9204, May 2008.