6 papers
Formation of nitriles and isonitriles by the heavy-ion irradiation of propionitrile in N2-rich astrophysical ices
Ana L. F. de Barros, David Dubois, Sreeja Raghunandanan +4
Context. Nitriles are key nitrogen-bearing organic molecules in dense clouds, star-forming regions, and nitrogen-rich icy environments. Understanding their stability and chemical e…
Experimental Measurements of Benzene Ice Critical Saturation Ratios on Titan Tholins and Impact on the Microphysical Modeling of Titan's South Polar Benzene Cloud
David Dubois, Erika Barth, Laura T. Iraci +3
The Cassini Composite Infrared Spectrometer (CIRS) revealed the presence of a benzene (C6H6) ice cloud in Titan's autumn south polar stratosphere, following the northern spring equ…
SPHEREx confirms predictions for artificial satellite trail pollution in Low Earth Orbit
Alejandro S. Borlaff, Pamela M. Marcum, Steve B. Howell +3
The number of artificial satellites in Low Earth Orbit (LEO) is increasing at an exponential rate since 2019. Satellites are visible to both ground and space telescopes, and their…
Carbon Nitride Monolayer Nanosheets: Astrochemical Insights into the Fate of Interstellar Hydrogen
Dubois David, Guichard Pierre, Pasquier Remi
Ubiquitously found in the Universe, atomic hydrogen represents up to 70% of the neutral gas composition of the Milky Way. As an adatom, hydrogen can physisorb or chemisorb onto int…
Modeling Low-Temperature Plasmas Simulating Titan's Atmosphere
David Dubois, Alexander W. Raymond, Ella Sciamma-O'Brien +1
In the study presented here, we model the gas phase chemistry induced by plasma discharge at low temperature (150 K) in the NASA Ames COSmIC Simulation Chamber (COSmIC) using a 1-d…
Photochemical Haze Formation on Titan and Uranus: A Comparative Review
David Dubois
The formation and evolution of haze layers in planetary atmospheres play a critical role in shaping their chemical composition, radiative balance, and optical properties. In the ou…