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dc.contributor.authorHarper, Joshua Méndez
dc.contributor.authorHelling, Christiane
dc.contributor.authorDufek, Josef
dc.identifier.citationHarper , J M , Helling , C & Dufek , J 2018 , ' Triboelectrification of KCl and ZnS particles in approximated exoplanet environments ' , Astrophysical Journal , vol. 867 , no. 2 , 123 .
dc.identifier.otherPURE: 256369823
dc.identifier.otherPURE UUID: f1a84b03-fdd0-4be4-ace8-65db429a0ccd
dc.identifier.otherScopus: 85056613469
dc.identifier.otherWOS: 000449412000012
dc.descriptionThis research was supported by the Blue Waters Graduate Fellowship.en
dc.description.abstractWhen mobilized, granular materials become charged as grains undergo collisions and frictional interactions. On Earth, this process, known as triboelectrification, has been recognized in volcanic plumes and sandstorms. Yet, frictional charging almost certainly exists on other worlds, both in our own Solar System (such as Mars, the Moon, and Venus) and exosolar planets. Indeed, observations suggest that numerous planets in the galaxy are enshrouded by optically-thick clouds or hazes. Triboelectric charging within these clouds may contribute to global electric circuits of these worlds, providing mechanisms to generate lightning, drive chemical processes in the atmospheres, and, perhaps, influence habitability. In this work, we explore the frictional electrification of potassium chloride and zinc sulfide, two substances proposed to make up the clouds of giant exo-planets with >50x solar metallicities, including the widely-studied super-Earth GJ 1214b, super-earth HD 97658b, Neptune-sized GJ 436b, and hot- Jupiter WASP-31b. We find that both materials become readily electrified when mobilized, attaining charge densities similar to those found on volcanic ash particles. Thus, if these worlds do indeed host collections of mineral particles in their atmospheres, these clouds are likely electrified and may be capable of producing lightning or corona discharge.
dc.relation.ispartofAstrophysical Journalen
dc.rightsCopyright © 2018. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at:
dc.subjectAtmospheric effectsen
dc.subjectPlanets and satellites: atmospheresen
dc.subjectPlanets and satellites: individual (GJ 1214b, HD 97658b, GJ 436b, GJ 3470b)en
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleTriboelectrification of KCl and ZnS particles in approximated exoplanet environmentsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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