Publications
| In Press | |
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 | Precise mass and radius of a transiting super-Earth planet orbiting the M dwarf TOI-1235: a planet in the radius gap? Paz Bluhm, Rafael Luque, Nestor Espinoza, Enric Palle, Jose A. Caballero, William D. Cochran, et al., Astronomy & Astrophysics CPSH: #0002 |
 | A warm Jupiter transiting an M dwarf: A TESS single transit event confirmed with the Habitable-zone Planet Finder Caleb I. Canas, Gudmundur Stefansson, Shubham Kanodia, Suvrath Mahadevan, William D. Cochran, Michael Endl, Paul Robertson,et al., Astronomical Journal CPSH: #0004 |
 | Shaping of the present-day deep biosphere at Chicxulub by the impact catastrophe that ended the Cretaceous Charles S. Cockell, Marco J. L. Coolen, Bettina Schaefer, Kliti Grice, Cornelia Wuchter, Luzie Schnieders, Joanna V. Morgan, Sean P. S. Gulick, et al., Nature Geosciences |
 | Persistent starspot signals on M dwarfs: multi-wavelength Doppler observations with the Habitable-zone Planet Finder and Keck/HIRES Paul Robertson, Gudmundur Stefansson, Suvrath Mahadevan, Michael Endl, William D. Cochran, Corey Beard, Chad F. Bender, Astrophysical Journal CPSH: #0003 |
| The Habitable-zone Planet Finder Reveals a High Mass and a Low Obliquity for the Young Neptune K2-25b Gudmundur Stefansson, Suvrath Mahadevan, Marissa Maney, Joe P. Ninan, Paul Robertson, Jayadev Rajagopal, William Cochran, et al., Astronomical Journal CPSH: #0001 |
 | Shocked titanite records Chicxulub hydrothermal alteration and impact age Nicholas E. Timms, Christopher L. Kirkland, Aaron J. Cavosie, Auriol S. P. Rae, William D. A. Rickard, Noreen J. Evans, Timmons M. Erickson, Axel Wittmann, Ludovic Ferriere, Gareth S. Collins, and Sean P. S. Gulick, Geochimica et Cosmochimica Acta CPSH: #0005 |
 | Rapid macrobenthic diversification and stabilization after the end-Cretaceous mass extinction event Francisco J. Rodriguez-Tovar, Christopher M. Lowery, Timothy J. Bralower, Sean P. S. Gulick, and Heather L. Jones, Geology CPSH: #0006 |
 | The Mega-MUSCLES Spectral Energy Distribution of TRAPPIST-1 David Wilson, Cynthia S. Froning, Girish Duvvuri, et al., Astrophysical Journal |
| 2020 | |
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 | Intramolecular distribution of 13C/12C isotopes in amino acids of diverse origins Cornelia Rasmussen & David W. Hoffman, Amino Acids CPSH: #0007 |
 | Probing the hydrothermal system of the Chicxulub Crater and its potential as a deep Earth habitat David A. Kring, Sonia M. Tikoo, Martin Schmieder, Ulrich Riller, Mario Rebolledo-Vieyra, Sarah L. Simpson, Gordon R. Osinski, William Zylberman, et al., Science Advances |
 | Myriapod divergence times differ between molecular clock and fossil evidence: U/Pb zircon ages of the earliest fossil millipede-bearing sediments Michael E. Brookfield, Elizabeth J. Catlos, and Stephanie E. Suarez, Historical Biology Molecular clock calculations suggest a late Cambrian (~ 500 Ma) divergence of myriapod classes. Yet, the earliest myriapods only appear in the latest Silurian (~425 Ma). 75 million years later; though correlation with the standard marine-based geological time scale is difficult. We radiometrically dated (U/Pb method) zircons… |
 | A steeply-inclined trajectory for the Chicxulub impact Gareth S. Collins, Neel Patel, Thomas M. Davison, Auriol S. P. Rae, Joanna V. Morgan, Sean P. S. Gulick, and the IODP-ICDP Expedition 364 Scientists, Nature Communications The environmental severity of large impacts on Earth is influenced by their impact trajectory. Impact direction and angle to the target plane affect the volume and depth of origin of vaporized target, as well as the trajectories of ejected material. The asteroid impact that formed… |
 | The Carbonate Geochemistry of Enceladus’ Ocean Christopher R. Glein and J. Hunter Waite, Geophysical Research Letters The plume composition at Enceladus contains clues about conditions and processes in the interior. We present new geochemical interpretations of Cassini mass spectrometry data from the plume gas and salt‐rich ice grains. It is found that self‐consistency between the data sets can be achieved with… |
 | Hydrogen, Hydrocarbons, and Habitability Across the Solar System Christopher R. Glein and Mikhail Yu Zolotov, Elements The ingredients to make an environment habitable (e.g., liquid water, chemical disequilibria, and organic molecules) are found throughout the solar system. Liquid water has existed transiently on some bodies and persistently as oceans on others. Molecular hydrogen occurs in a plume on Saturn’s moon Enceladus. It can drive the reduction of CO2 to release energy. Methane has been observed… |
 | Spatial U-Pb age distribution in shock-recrystallized zircon – A case study from the Rochechouart impact structure, France Cornelia Rasmussen, Daniel F. Stockli, Timmons M. Erickson, and Martin Schmieder, Geochimica et Cosmochimica Acta Age determination of impact structures via the zircon U-Pb system remains challenging and often ambiguous due to highly variable effects of shock metamorphism on U-Pb geochronology. It is, therefore, crucial to link the observed zircon microtextures… |
 | U-Pb memory behavior in Chicxulub’s peak ring — Applying U-Pb depth profiling to shocked zircon Cornelia Rasmussen, Daniel F.Stockli, Catherine H. Ross, Annemarie Pickersgill, Sean P. Gulick, Martin Schmieder, Gail L. Christeson, Axel Wittmann, David A. Kring, Joanna V. Morgan, and the IODP-ICDP Expedition 364 Scientists, Chemical Geology The zircon U-Pb system is one of the most robust geochronometers, but during an impact event individual crystals can be affected differently by the passage of the shock wave and impact generated heat. Unraveling the potentially complex thermal history recorded by zircon crystals… |
 | The Search for Extraterrestrial Intelligence: A Realpolitik Consideration Kenneth W. Wisian and John W. Traphagan, Space Policy In the vigorous academic debate over the risks of the Search for ExtraTerrestrial Intelligence (SETI) and active Messaging ExtraTerrestrial Intelligence (ETI) (METI), a significant factor has been largely overlooked. Specifically, the risk of merely detecting an alien signal from passive SETI activity is usually… |
| 2019 | |
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 | Testing the deltaic origin of fan deposits at Bradbury Crater, Mars Michael S. Bramble, Timothy A. Goudge, Ralph E. Milliken, and John F. Mustard, Icarus The stratigraphic architectures of three fan-shaped deposits at Bradbury crater, Mars were investigated to test the hypothesis that the deposits were formed in standing bodies of water. Quantitative stratigraphic methods were applied… |
 | Time will tell: temporal evolution of Martian gullies and palaeoclimatic implications Tjalling de Haas, Susan J. Conway, Frances E. G. Butcher, Joseph Levy, Peter M. Grindrod, Timothy A. Goudge, and Matthew R. Balme, Geological Society of London To understand Martian palaeoclimatic conditions and the role of volatiles therein, the spatiotemporal evolution of gullies must be deciphered. While the spatial distribution of gullies has been extensively studied, their temporal evolution is poorly understood. We show that gully size is similar… |
 | The Future of Reef Ecosystems in the Gulf of Mexico: Insights From Coupled Climate Model Simulations and Ancient Hot-House Reefs Sylvia G. Dee, Mark A. Torres, Rowan C. Martindale, Anna Weiss, and Kristine L. DeLong, Frontiers in Marine Science Shallow water coral reefs and deep sea coral communities are sensitive to current and future environmental stresses, such as changes in sea surface temperatures (SST), salinity, carbonate chemistry, and acidity. Over the last half-century, some reef communities have been disappearing at an alarming pace. This study focuses on the Gulf of Mexico, where the majority of shallow coral reefs are reported to be… |
 | Resilience of marine invertebrate communities during the early Cenozoic hyperthermals William J. Foster, Christopher L. Garvie, Anna M. Weiss, A. Drew Muscente, Martin Aberhan, John W. Counts, and Rowan C. Martindale, Scientific Reports The hyperthermal events of the Cenozoic, including the Paleocene-Eocene Thermal Maximum, provide an opportunity to investigate the potential effects of climate warming on marine ecosystems. Here, we examine the shallow benthic marine communities preserved in the late Cretaceous… |
 | Suppressed competitive exclusion enabled the proliferation of Permian/Triassic boundary microbialites William J. Foster, Katrin Heindel, Sylvain Richoz, Jana Gliwa, Daniel J. Lehrmann, Aymon Baud, Tea Kolar‐Jurkovsek, Dunja Aljinovic, Bogdan Jurkovsek, Dieter Korn, Rowan C. Martindale, and Jorn Peckmann, The Depositional Record During the earliest Triassic microbial mats flourished in the photic zones of marginal seas, generating widespread microbialites. It has been suggested that anoxic conditions in shallow marine environments, linked to the end‐Permian mass extinction, limited mat‐inhibiting metazoans allowing for this microbialite expansion. The presence of a diverse… |
 | A Hot Ultraviolet Flare on the M Dwarf Star GJ 674 Cynthia S. Froning, Adam Kowalski, Kevin France, R. O. Parke Loyd, P. Christian Schneider, Allison Youngblood, David Wilson, Alexander Brown, Zachory Berta-Thompson, J. Sebastian Pineda, Jeffrey Linsky, Sarah Rugheimer, and Yamila Miguel, Astrophysical Journal Letters As part of the Mega-Measurements of the Ultraviolet Spectral Characteristics of Low-Mass Exoplanetary Systems Hubble Space Telescope (HST) Treasury program, we obtained time-series ultraviolet spectroscopy of the M2.5V star, GJ 674. During the far-ultraviolet (FUV) monitoring observations, the target exhibited several small flares and one large flare (E FUV = 1030.75 erg) that persisted over the entirety… |
 | Deltaic deposits indicative of a paleo-coastline at Aeolis Dorsa, Mars Cory M. Hughes, Benjamin T. Cardenas, Timothy A. Goudge, and David Mohrig, Icarus Recent work at Aeolis Dorsa, Mars has identified exposure of fluvial sedimentary outcrop deposited early in martian history, likely during the late Hesperian or earlier. Here, we examine a ∼1200 km2 exposure of sedimentary outcrop in southeast Aeolis Dorsa. Total thickness of the stratigraphic section exceeds 100 m. We identify eight discrete complexes… |
 | The first day of the Cenozoic Sean P. S. Gulick, Timothy J. Bralower, Jens Ormö, Brendon Hall, Kliti Grice, Bettina Schaefer, Shelby Lyons, Katherine H. Freeman, Joanna V. Morgan, Natalia Artemieva, Pim Kaskes, Sietze J. de Graaff, Michael T. Whalen, Gareth S. Collins, Sonia M. Tikoo, Christina Verhagen, Gail L. Christeson, Philippe Claeys, Marco J. L. Coolen, Steven Goderis, Kazuhisa Goto, Richard A. F. Grieve, Naoma McCall, Gordon R. Osinski, Auriol S. P. Rae, Ulrich Riller, Jan Smit, Vivi Vajda, Axel Wittmann, and the IODP-ICDP Expedition 364 Scientists, Proceeding of the National Academy of Sciences Highly expanded Cretaceous–Paleogene (K-Pg) boundary section from the Chicxulub peak ring, recovered by International Ocean Discovery Program (IODP)–International Continental Scientific Drilling Program (ICDP) Expedition 364, provides an unprecedented window into the immediate aftermath of the impact. Site M0077 includes ∼130 m of impact melt rock and suevite deposited the first day of the Cenozoic covered by <1 m of micrite-rich carbonate deposited over subsequent weeks to years. We present an interpreted series of events… |
 | Ocean Drilling Perspectives on Meteorite Impacts Christopher M. Lowery, Joanna V. Morgan, Sean P. S. Gulick, Timothy J. Bralower, Gail L. Christeson, and the IODP-ICDP Expedition 364 Scientists, Oceanography Extraterrestrial impacts that reshape the surfaces of rocky bodies are ubiquitous in the solar system. On early Earth, impact structures may have nurtured the evolution of life. More recently, a large meteorite impact off the Yucatán Peninsula in Mexico at the end of the Cretaceous caused the disappearance of 75% of species known from the fossil record, including non-avian dinosaurs… |
 | The survival, recovery, and diversification of metazoan reef ecosystems following the end-Permian mass extinction event Rowan C. Martindale, William J. Foster, and Felicitasz Velledits, Palaeogeography, Palaeoclimatology, Palaeoecology The Triassic Period records important ecological transitions in the aftermath of the end-Permian mass extinction and is a key interval in the evolution of modern coral reefs. There have been several critical developments in our understanding of Triassic reef evolution over the past decade: the timing of events and duration… |
| Contributions from Accreted Organics to Titan’s Atmosphere: New Insights from Cometary and Chondritic Data Kelly E. Miller, Christopher R. Glein, and J. Hunter Waite Jr., Astrophysical Journal Since its discovery in the first half of the 20th century, scientists have puzzled over the origins of Titan’s atmosphere. Current models suggest that atmospheric N2 on Titan may have originated from NH3-bearing ice with N-isotopic ratios similar to those observed in NH2 in cometary comae (14N/15N ~ 136). In contrast, N2 ice appears to be too 15N poor to explain Titan’s atmosphere… |
 | Explosive interaction of impact melt and seawater following the Chicxulub impact event Gordon R. Osinski, Richard A. F. Grieve, Patrick J. A. Hill, Sarah L. Simpson, Charles Cockell, Gail L. Christeson, Matthias Ebert, Sean Gulick, H. Jay Melosh, Ulrich Riller, Sonia M. Tikoo, and Axel Wittmann, Geology The impact of asteroids and comets with planetary surfaces is one of the most catastrophic, yet ubiquitous, geological processes in the solar system. The Chicxulub impact event, which has been linked to the Cretaceous-Paleogene (K-Pg) mass extinction marking the beginning of the Cenozoic Era, is arguably the most significant singular geological event in the past 100 million years… |
 | Impact‐Induced Porosity and Microfracturing at the Chicxulub Impact Structure Auriol S. P. Rae, Gareth S. Collins, Joanna V. Morgan, Tobias Salge, Gail L. Christeson, Jody Leung, Johanna Lofi, Sean P. S. Gulick, Michael Poelchau, Ulrich Riller, Catalina Gebhardt, Richard A. F. Grieve, Gordon R. Osinski and the IODP-ICDP Expedition 364 Scientists, Journal of Geophysical Research: Planets Porosity and its distribution in impact craters has an important effect on the petrophysical properties of impactites: seismic wave speeds and reflectivity, rock permeability, strength, and density. These properties are important for the identification of potential craters and… |
 | Microbial life in the nascent Chicxulub crater Bettina Schaefer, Kliti Grice, Marco J. L. Coolen, Roger E. Summons, Xingqian Cui, Thorsten Bauersachs, Lorenz Schwark, Michael E. Böttcher, Timothy J. Bralowe, Shelby L. Lyons, Katherine H. Freeman, Charles S. Cockell, Sean P. S. Gulick, Joanna V. Morgan, Michael T. Whalen, Christopher M. Lowery, and Vivi Vajda, Geology The Chicxulub crater was formed by an asteroid impact at ca. 66 Ma. The impact is considered to have contributed to the end-Cretaceous mass extinction and reduced productivity in the world’s oceans due to a transient cessation of photosynthesis. Here, biomarker profiles extracted from crater core material reveal… |
 | High‐Resolution Thermal Environment of Recurring Slope Lineae in Palikir Crater, Mars, and Its Implications for Volatiles Norbert Schorghofer, Joseph S. Levy, and Timothy A. Goudge, Journal of Geophysical Research: Planets A thermophysical model for rough terrain is developed that is capable of processing spatial domains of megapixel size. This computational advance makes it possible to characterize thermal environments on Mars at unprecedented scale and at a resolution of 1 m per pixel. The model is applied to Palikir Crater, Mars, where… |
 | A U-Pb zircon age constraint on the oldest-recorded air-breathing land animal Stephanie E. Suarez, Michael E. Brookfield, Elizabeth J. Catlos, and Daniel F. Stockli, PLoS One The oldest-known air-breathing land animal is the millipede Pneumodesmus newmani, found in the Cowie Harbour Fish Bed at Stonehaven, Scotland. Here we report the youngest, most concordant 238U-206Pb zircon age from ash below the fish bed of 413.7±4.4 Ma (±2σ), whereas the youngest age from a tuffaceous sandstone… |
| Orbital Identification of Hydrated Silica in Jezero Crater, Mars Jesse D. Tarnas, John F. Mustard, Honglei Lin, Timothy A. Goudge, Elena S. Amador, Michael S. Bramble, Christopher H. Kremer, Xiaomin Zhang, Yuki Itoh, and Mario Parente, Geophysical Research Letters Silica has the highest demonstrated potential of any phase to preserve microfossils on Earth and therefore may host potential biosignatures on Mars. We detected hydrated silica in Jezero crater, the landing site of the National Aeronautics and Space Administration’s Mars 2020 rover mission, by applying Dynamic Aperture Factor Analysis/Target Transformation to images from… |
 | Slope, elevation, and thermal inertia trends of martian recurring slope lineae initiation and termination points: Multiple possible processes occurring on coarse, sandy slopes Michelle Tebolt, Joseph Levy, Timothy Goudge, and Norbert Schorghofer, Icarus Recurring slope lineae (RSL) are dark linear features on the surface of Mars that advance incrementally downslope, fading and re-growing annually. Numerous hypotheses have been proposed to explain RSL formation, including “wet” models that involve liquid water orbrines and “dry” mechanisms involving… |
 | Decomposition of amino acids in water with application to in-situ measurements of Enceladus, Europa and other hydrothermally active icy ocean worlds Ngoc Truong, Adam A. Monroe, Christopher R. Glein, Ariel D. Anbar, and Jonathan I. Lunine, Icarus To test the potential of using amino acid abundances as a biosignature at icy ocean worlds, we investigate whether primordial amino acids (accreted or formed by early aqueous processes) could persist until the present time. By examining the decomposition kinetics of amino acids in aqueous solution based on existing laboratory rate data, we find… |
 | Paleobiological Traits That Determined Scleractinian Coral Survival and Proliferation During the Late Paleocene and Early Eocene Hyperthermals Anna M. Weiss and Rowan C. Martindale, Paleoceanography and Paleoclimatology Coral reefs are particularly sensitive to environmental disturbances, such as rapid shifts in temperature or carbonate saturation. Work on modern reefs has suggested that some corals will fare better than others in times of stress and that their life history traits might correlate with species survival. These same traits can be applied to fossil taxa to assess… |