2013 Annual Science Report
Rensselaer Polytechnic Institute Reporting | SEP 2012 – AUG 2013
Executive Summary
Introduction
Our investigators are members of the New York Center for Astrobiology (NYCA; www.origins.rpi.edu), based at Rensselaer Polytechnic Institute (RPI) in partnership with Syracuse University, the University at Albany, the University of Arizona, and Albion College. Our research is devoted to elucidating the origins of both life itself and of habitable planetary environments, in our own Solar System and in planet-forming regions around other stars: in short, to develop realistic, widely applicable models for the emergence of molecular complexity leading to life. This is being accomplished through a synergy of interdisciplinary research that unifies astronomical observations, laboratory experiments and computational modeling. It addresses several goals of the Astrobiology Roadmap, including Goal 1 (potential for habitable planets), Goal 2 (life in our Solar System), Goal 3 (origins of life), Goal 4 (Earth’s early biosphere and environment), and Goal 7 (signatures of life ... Continue reading.
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Douglas Whittet
NAI, ASTEP, ASTID, Exobiology -
TEAM Active Dates:
2/2009 - 1/2015 CAN 5 -
Team Website:
http://www.origins.rpi.edu -
Members:
55 (See All) - Visit Team Page
Project Reports
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Project 2: Processing of Precometary Ices in the Early Solar System
The discovery of numerous planetary systems still in the process of formation provides a unique opportunity to see how our own solar system may have formed 4.6 billion years ago. Our research group studies physical processes that determine thermal environments in and around young planetary systems in order to constrain the prebiotic chemistry which can occur there. In one study we have built a unique code which simulates the heating of dense molecular gas in chemically active outflows (CAOs) associated with protostars. Our code will be used to model the wealth of molecular observations of CAOs which will be obtained by SOFIA and other observatories. In another study we have discovered a new mechanism whereby asteroids in the solar nebula are heated by magnetohydrodynamical processes. The goal of the second study is to determine whether asteroids can be warm enough to support prebiotic chemistry in protoplanetary systems that were not innoculated by short-lived radionuclides such as aluminum-26.
ROADMAP OBJECTIVES: 1.1 3.1 3.2 -
Project 6: The Environment of the Early Earth
This project involves the development of capabilities that will allow scientists to obtain information about the conditions on early Earth (3.0 to 4.5 billion years ago) by conducting chemical analyzes of crystals (minerals) that have survived since that time. Minerals incorporate trace concentrations of ions and gaseous molecules from the local environment. We are conducting experiments to calibrate the uptake of these “impurities” that we expect to serve as indicators of temperature, moisture, oxidation state and atmosphere composition. Our focus has been mainly on zircon, quartz, and apatite.
ROADMAP OBJECTIVES: 1.1 4.1 4.3 -
Project 5: Vistas of Early Mars: In Preparation for Sample Return
To understand the history of life in the solar system requires knowledge of how hydrous minerals form on planetary surfaces, and the role minerals may play in the development of potential life forms. The minerals hematite and jarosite have been identified on Mars and presented as in situ evidence for aqueous activity. This project seeks to understand (i) the conditions required for jarosite and hematite formation and preservation on planetary surfaces, and (ii) the conditions under which their “radiometric clocks” can be reset (e.g., during changes in environmental conditions such as temperature). By investigating the kinetics of noble gases in minerals, known to occur on Mars and Earth, we will be prepared to analyze and properly interpret ages measured on samples from future Mars sample return missions.
ROADMAP OBJECTIVES: 1.1 2.1 7.1 -
Project 3: Impact History of the Earth-Moon System
The influx of interplanetary debris onto the early Earth represents a major hazard to the emergence of life. Large crater-forming bodies must have been common in the early solar system, as craters are seen on all ancient solid surfaces from Mercury to the moons of the outer planets. Impact craters are few in number on the Earth today only because geologic activity and erosion gradually erase them. The Earth’s nearest neighbor, the Moon, lacks an atmosphere and significant tectonic activity, and therefore retains a record of past impacts. The goal of our research is to reconstruct the bombardment history of the Moon, and by proxy the Earth, to establish when the flux of sterilizing impacts declined sufficiently for the Earth to became habitable.
ROADMAP OBJECTIVES: 4.3 -
Project 1: Interstellar Origins of Preplanetary Matter
Interstellar space is rich in the raw materials required to build planets and life, including essential chemical elements (H, C, N, O, Mg, Si, Fe, etc.) and compounds (water, organic molecules, planet-building minerals). This research project seeks to characterize the composition and structure of these materials and the chemical pathways by which they form and evolve. The long-term goal is to determine the inventories of proto-planetary disks around young sun-like stars, leading to a clear understanding of the processes that led to our own origins and insight into the probability of life-supporting environments emerging around other stars.
ROADMAP OBJECTIVES: 1.1 3.1 -
Project 4: Survival of Sugars in Ice/Mineral Mixtures on High Velocity Impact
Understanding the delivery and preservation of organic molecules in meteoritic material is important to understanding the origin of life on Earth. Though we know that organic molecules are abundant in meteorites, comets, and interplanetary dust particles, few studies have examined how impact processes affect their chemistry and survivability under extreme temperatures and pressures. We are investigating how impact events may change the structure of simple sugars, both alone and when combined with ice mixtures. The experiments will allow us to understand how sugar chemistry is affected by high pressure events and to contrast the survival probabilities of sugars in meteorite and comet impacts. This will lead to a better understanding of how organic molecules are affected during their delivery to Earth. This project leverages expertise in two different NAI nodes, increasing collaborative interaction among NAI investigators.
ROADMAP OBJECTIVES: 1.1 3.1 4.1 4.3 -
Project 7: Prebiotic Chemical Catalysis on Early Earth and Mars
The “RNA World” hypothesis is the current paradigm for the origins of terrestrial life. Our research is aimed at testing a key component of this paradigm: the efficiency with which RNA molecules form and grow under realistic conditions. We are studying abiotic production and polymerization of RNA by catalysis on montmorillonite clays. The catalytic efficiency of different montmorillonites are determined and compared, with the goal of determining which properties distinguish good catalysts from poor catalysts. We are also investigating the origin of montmorillonites, to test their probable availability on the early Earth and Mars, and the nature of catalytic activity that could have led to chiral selectivity on Earth.
ROADMAP OBJECTIVES: 3.1 3.2 -
Project 8: Microenvironmental Influences on Prebiotic Synthesis
Before biotic, i.e., “biologically-derived” pathways for the formation of essential biological molecules such as RNA, DNA and proteins could commence, abiotic pathways were needed to form the molecules that were the basis for the earliest life. Much research has been done on possible non-biological routes to synthesis of RNA, thought by many to be the best candidate or model for the emergence of life. Our work focuses on possible physicochemical microenvironments and processes on early earth that could have influenced and even directed or templated the formation of RNA or its predecessors.
ROADMAP OBJECTIVES: 3.1 3.2
Education & Public Outreach
- Undergraduate Research
- Women in Science & Engineering Mentoring Event
- Multidisiplinary Science PhD on Research and Education Methodology
- RPI Astrobiology Course
- U Albany Astrobiology Course
- Astrobiology Seminar Series
- Informal Outreach
- WAMC National Public Radio Astrobiology Series
- Bernard Harris ExxonMobil Summer Science Camp
- Astrobiology Teachers Academy
Publications
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Brown, L. R., Troutman, M. R., & Gibb, E. L. (2013). SPECTRO-ASTROMETRY OF WATER IN DR TAURI. The Astrophysical Journal, 770(1), L14. doi:10.1088/2041-8205/770/1/l14
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Ciolek, G. E., & Roberge, W. G. (2013). MOLECULAR LINE EMISSION FROM MULTIFLUID SHOCK WAVES. I. NUMERICAL METHODS AND BENCHMARK TESTS. The Astrophysical Journal, 768(1), 78. doi:10.1088/0004-637x/768/1/78
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Gibb, E. L., & Horne, D. (2013). DETECTION OF CH 4 IN THE GV TAU N PROTOPLANETARY DISK. The Astrophysical Journal, 776(2), L28. doi:10.1088/2041-8205/776/2/l28
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Hardegree-Ullman, E., Harju, J., Juvela, M., Sipilä, O., Whittet, D. C. B., & Hotzel, S. (2013). CHEMICAL AND PHYSICAL CONDITIONS IN MOLECULAR CLOUD CORE DC 000.4–19.5 (SL42) IN CORONA AUSTRALIS. The Astrophysical Journal, 763(1), 45. doi:10.1088/0004-637x/763/1/45
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Herbst, E. (2014). Three milieux for interstellar chemistry: gas, dust, and ice. Phys. Chem. Chem. Phys., 16(8), 3344–3359. doi:10.1039/c3cp54065k
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McCaffrey, V. P., Zellner, N. E. B., Waun, C. M., Bennett, E. R., & Earl, E. K. (2014). Reactivity and Survivability of Glycolaldehyde in Simulated Meteorite Impact Experiments. Orig Life Evol Biosph, 44(1), 29–42. doi:10.1007/s11084-014-9358-5
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Menzel, R. L., & Roberge, W. G. (2013). REEXAMINATION OF INDUCTION HEATING OF PRIMITIVE BODIES IN PROTOPLANETARY DISKS. The Astrophysical Journal, 776(2), 89. doi:10.1088/0004-637x/776/2/89
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Mueller, T., Watson, E. B., Trail, D., Wiedenbeck, M., Van Orman, J., & Hauri, E. H. (2014). Diffusive fractionation of carbon isotopes in γ-Fe: Experiment, models and implications for early solar system processes. Geochimica et Cosmochimica Acta, 127, 57–66. doi:10.1016/j.gca.2013.11.014
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Trail, D., Watson, E. B., & Tailby, N. D. (2013). Insights into the Hadean Earth from experimental studies of zircon. J Geol Soc India, 81(5), 605–636. doi:10.1007/s12594-013-0084-9
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Vasyunin, A. I., & Herbst, E. (2013). REACTIVE DESORPTION AND RADIATIVE ASSOCIATION AS POSSIBLE DRIVERS OF COMPLEX MOLECULE FORMATION IN THE COLD INTERSTELLAR MEDIUM. The Astrophysical Journal, 769(1), 34. doi:10.1088/0004-637x/769/1/34
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Vasyunina, T., Vasyunin, A. I., Herbst, E., Linz, H., Voronkov, M., Britton, T., … Schuller, F. (2013). ORGANIC SPECIES IN INFRARED DARK CLOUDS. The Astrophysical Journal, 780(1), 85. doi:10.1088/0004-637x/780/1/85
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Whittet, D. C. B., Poteet, C. A., Chiar, J. E., Pagani, L., Bajaj, V. M., Horne, D., … Adamson, A. J. (2013). ICE AND DUST IN THE PRESTELLAR DARK CLOUD LYNDS 183: PREPLANETARY MATTER AT THE LOWEST TEMPERATURES. The Astrophysical Journal, 774(2), 102. doi:10.1088/0004-637x/774/2/102
- B., Z.N.E. & Delano, J.W. 40Ar/39Ar ages of lunar impact glasses: Compositional-, size-, and shape-dependencies. Geochimica et Cosmochimica Acta.
- Gombosi, D.J., Baldwin, S.L., Watson, E.B., Swindle, T.D., Delano, J.W. & Roberge, W.G. (2013). Argon Diffusion in Apollo 16 Impact Glass Spherules: Implications for 40Ar/39Ar Dating of Lunar Impact Events. Geochimicha et Cosmochimica Acta.
2013 Teams
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Arizona State University
Carnegie Institution of Washington
Georgia Institute of Technology
Massachusetts Institute of Technology
NASA Ames Research Center
NASA Goddard Space Flight Center
NASA Jet Propulsion Laboratory - Icy Worlds
NASA Jet Propulsion Laboratory - Titan
Pennsylvania State University
Rensselaer Polytechnic Institute
University of Hawaii, Manoa
University of Illinois at Urbana-Champaign
University of Southern California
University of Wisconsin
VPL at University of Washington