128 citations · 739 across the 27 of their papers we have counts for
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A Cross-Laboratory Comparison Study of Titan Haze Analogs: Surface Energy II
Eric C. Austin, Xinting Yu, Chao He +10
The organic haze particles on Titan play important roles in atmospheric cloud formation and aerosol-lake interactions. These processes are strongly influenced by the surface energy…
Ultraviolet Radiation Effects on the Optical Properties of Water-Dominated Exoplanet Hazes
Lori Huseby, Sarah E. Moran, Tiffany Kataria +8
Temperate sub-Neptune and terrestrial exoplanets could contain large inventories of water in various phases, such as water-dominated atmospheres or even oceans. Observations have s…
Effects of Ultraviolet Radiation on Sub-Neptune Exoplanet Hazes Through Laboratory Experiments
Lori Huseby, Sarah E. Moran, Neil Pearson +9
Temperate sub-Neptune exoplanets could contain large inventories of water in various phases, such as water-worlds with water-rich atmospheres or even oceans. Both space-based and g…
Organic hazes as a source of life's building blocks to warm little ponds on the Hadean Earth
Ben K. D. Pearce, Sarah M Hörst, Joshua A. Sebree +1
Over 4 billion years ago, Earth is thought to have been a hazy world akin to Saturn's moon Titan. The organic hazes in the atmosphere at this time could contain a vast inventory of…
Optical Properties of Organic Haze Analogues in Water-rich Exoplanet Atmospheres Observable with JWST
Chao He, Michael Radke, Sarah E. Moran +9
JWST has begun its scientific mission, which includes the atmospheric characterization of transiting exoplanets. Some of the first exoplanets to be observed by JWST have equilibriu…
Titan Atmospheric Chemistry Revealed by Low-temperature N2-CH4 Plasma Discharge Experiments
Chao He, Joseph Serigano, Sarah M. Horst +2
Chemistry in Titan's N2-CH4 atmosphere produces complex organic aerosols. The chemical processes and the resulting organic compounds are still far from understood, although extensi…
An experimental and theoretical investigation of HCN production in the Hadean Earth atmosphere
Ben K. D. Pearce, Chao He, Sarah M. Hörst
A critical early stage for the origin of life on Earth may have involved the production of hydrogen cyanide (HCN) in a reducing, predominantly H atmosphere. HCN is crucial for…
Triton Haze Analogues: the Role of Carbon Monoxide in Haze Formation
Sarah E. Moran, Sarah M. Hörst, Chao He +7
Triton is the largest moon of the Neptune system and possesses a thin nitrogen atmosphere with trace amounts of carbon monoxide and methane, making it of similar composition to tha…
Optical Constants of Titan Haze Analogue from 0.4 to 3.5 μm: Determined Using Vacuum Spectroscopy
Chao He, Sarah M. Horst, Michael Radke +1
Titan's thick atmosphere is primarily composed of nitrogen and methane. Complex chemistry happening in Titan's atmosphere produces optically thick organic hazes. These hazes play s…
Haze Evolution in Temperate Exoplanet Atmospheres Through Surface Energy Measurements
Xinting Yu, Chao He, Xi Zhang +13
Photochemical hazes are important opacity sources in temperate exoplanet atmospheres, hindering current observations from characterizing exoplanet atmospheric compositions. The haz…
Surface Energy of the Titan Aerosol Analog "Tholin"
Xinting Yu, Sarah Horst, Chao He +3
The photochemical haze produced in the upper atmosphere of Titan plays a key role in various atmospheric and surface processes on Titan. The surface energy, one important physical…
Haze Formation in Warm H2-rich Exoplanet Atmospheres
Chao He, Sarah M. Horst, Nikole K. Lewis +8
New observing capabilities coming online over the next few years will provide opportunities for characterization of exoplanet atmospheres. However, clouds/hazes could be present in…
Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS
J. Serigano, S. M. Hörst, C. He +4
The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere and revealed a much more chemically complex environment than previously believed. Observations from the…
Chemistry of Temperate Super-Earth and Mini-Neptune Atmospheric Hazes from Laboratory Experiments
Sarah E. Moran, Sarah M. Hörst, Véronique Vuitton +12
Very little experimental work has been done to explore the properties of photochemical hazes formed in atmospheres with very different compositions or temperatures than that of the…
Sulfur-driven Haze Formation in Warm CO2-rich Exoplanet Atmospheres
Chao He, Sarah M. Horst, Nikole K. Lewis +8
Sulfur gases significantly affect the photochemistry of planetary atmospheres in our Solar System, and are expected to be important components in exoplanet atmospheres. However, su…
Single particle triboelectrification of Titan sand analogs
Xinting Yu, Sarah M. Horst, Chao He +1
Sand electrification is important for aeolian sediment transportation on terrestrial bodies with silicate sand as the main sediment composition. However, it has not been thoroughly…
Gas Phase Chemistry of Cool Exoplanet Atmospheres: Insight from Laboratory Simulations
Chao He, Sarah M. Hörst, Nikole K. Lewis +6
Photochemistry induced by stellar UV flux should produce haze particles in exoplanet atmospheres. Recent observations indicate that haze and/or cloud layers exist in the atmosphere…
Where does Titan Sand Come From: Insight from Mechanical Properties of Titan Sand Candidates
Xinting Yu, Sarah M. Hörst, Chao He +2
Extensive equatorial linear dunes exist on Titan, but the origin of the sand, which appears to be organic, is unknown. We used nanoindentation to study the mechanical properties of…
Photochemical Haze Formation in the Atmospheres of super-Earths and mini-Neptunes
Chao He, Sarah M. Horst, Nikole K. Lewis +8
UV radiation can induce photochemical processes in exoplanet atmospheres and produce haze particles. Recent observations suggest that haze and/or cloud layers could be present in t…
Exploring the Atmosphere of Neoproterozoic Earth: The Effect of O on Haze Formation and Composition
Sarah M. Hörst, Chao He, Melissa S. Ugelow +3
Previous studies of haze formation in the atmosphere of the Early Earth have focused on N/CO/CH atmospheres. Here, we experimentally investigate the effect of O$_…
Laboratory Simulations of Haze Formation in the Atmospheres of super-Earths and mini-Neptunes: Particle Color and Size Distribution
Chao He, Sarah M. Horst, Nikole K. Lewis +7
Super-Earths and mini-Neptunes are the most abundant types of planets among the ~3500 confirmed exoplanets, and are expected to exhibit a wide variety of atmospheric compositions.…
Haze Production in the Atmospheres of super-Earths and mini-Neptunes: Insights from the Lab
Sarah M. Hörst, Chao He, Nikole K. Lewis +6
Numerous solar system atmospheres possess aerosols including the characteristic organic hazes of Titan and Pluto. Haze particles substantially impact atmospheric temperatures struc…
The Effect of Adsorbed Liquid and Material Density on Saltation Threshold: Insight from Laboratory and Wind Tunnel Experiments
Xinting Yu, Sarah M. Hörst, Chao He +4
Saltation threshold, the minimum wind speed for sediment transport, is a fundamental parameter in aeolian processes. The presence of liquid, such as water on Earth or methane on Ti…
Carbon Monoxide Affecting Planetary Atmospheric Chemistry
Chao He, Sarah M. Horst, Sydney Riemer +3
CO is an important component in many N2/CH4 atmospheres including Titan, Triton, and Pluto, and has also been detected in the atmosphere of a number of exoplanets. Numerous experim…