Faculty Publications

Title

Chemistry of temperate super-earth and mini-neptune atmospheric hazes from laboratory experiments

Document Type

Article

Journal/Book/Conference Title

Planetary Science Journal

Volume

1

Issue

1

Abstract

Very little experimental work has been done to explore the properties of photochemical hazes formed in atmospheres with very different compositions or temperatures than those of the outer solar system or of early Earth. With extrasolar planet discoveries now numbering thousands, this untapped phase space merits exploration. This study presents measured chemical properties of haze particles produced in laboratory analogs of exoplanet atmospheres. We used very high-resolution mass spectrometry to measure the chemical components of solid particles produced in atmospheric chamber experiments. Many complex molecular species with general chemical formulas CwHxNyOz were detected. We detect molecular formulas of prebiotic interest in the data, including those for the monosaccharide glyceraldehyde, a variety of amino acids and nucleotide bases, and several sugar derivatives. Additionally, the experimental exoplanetary haze analogs exhibit diverse solubility characteristics, which provide insight into the possibility of further chemical or physical alteration of photochemical hazes in super-Earth and mini-Neptune atmospheres. These exoplanet analog particles can help us better understand chemical atmospheric processes and suggest a possible source of in situ atmospheric prebiotic chemistry on distant worlds.

Original Publication Date

6-1-2020

DOI of published version

10.3847/PSJ/ab8eae

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

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