2026-09-20T01:35:54Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/1137952026-06-16T18:16:35Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022

Kerri Cahoy. Webber, Matthew (Matthew William) Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2018-02-16T20:06:07Z 2018-02-16T20:06:07Z 2017 2017 http://hdl.handle.net/1721.1/113795 1022947628 Thesis: Ph. D. in Planetary Science, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 89-91). This thesis uses planetary albedo models to investigate variations in visible wavelength phase curves of exoplanets. We improve upon existing exoplanet giant planet albedo models and incorporate exoplanet general circulation models to analyze the composition and occurrence of clouds on tidally locked exoplanets. We confirm that non-uniform cloud coverage on the dayside of tidally locked exoplanets will affect the magnitude and location of the maximum of the phase curve. We then apply the models to the exoplanet Kepler-7b and consider the effect of varying cloud species, sedimentation efficiency, particle size, and cloud altitude. In the context of Kepler Space Telescope observations, we show that the cloud compositions and spatial distributions can be constrained. We also investigate exoplanet HD189733b, modeling its clouds, albedo and phase curves. We create 3D maps of cloud formation and analyze how cloud composition, spatial distribution, and temperature dependence affects albedo spectra for HD189733b. We use the modeled cloud patterns of spatially-varying composition and temperature to determine the observable albedo spectra and phase curves for HD189733b by fitting to the observations of Berdyugina et al. (2011), Evans el al. (2013), and Wiktorowicz et al. (2015). We show that these integrated albedo and general circulation models enable us to model non-uniform reflectivity due to exoplanet clouds, and to better interpret observations. by Matthew Webber. Ph.D. in Planetary Science 91 pages eng Massachusetts Institute of Technology MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Earth, Atmospheric, and Planetary Sciences. Mapping exoplanet clouds and albedo from phase curves and spectra Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="0dae14d6-0d44-4d73-bf2e-73e9a6d2d4ad"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Mapping exoplanet clouds and albedo from phase curves and spectra</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2017</PublicationDate> <Authors> <Author> <DisplayName>Webber, Matthew (Matthew William)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Earth, Atmospheric, and Planetary Sciences.</Keyword> <Abstract>This thesis uses planetary albedo models to investigate variations in visible wavelength phase curves of exoplanets. We improve upon existing exoplanet giant planet albedo models and incorporate exoplanet general circulation models to analyze the composition and occurrence of clouds on tidally locked exoplanets. We confirm that non-uniform cloud coverage on the dayside of tidally locked exoplanets will affect the magnitude and location of the maximum of the phase curve. We then apply the models to the exoplanet Kepler-7b and consider the effect of varying cloud species, sedimentation efficiency, particle size, and cloud altitude. In the context of Kepler Space Telescope observations, we show that the cloud compositions and spatial distributions can be constrained. We also investigate exoplanet HD189733b, modeling its clouds, albedo and phase curves. We create 3D maps of cloud formation and analyze how cloud composition, spatial distribution, and temperature dependence affects albedo spectra for HD189733b. We use the modeled cloud patterns of spatially-varying composition and temperature to determine the observable albedo spectra and phase curves for HD189733b by fitting to the observations of Berdyugina et al. (2011), Evans el al. (2013), and Wiktorowicz et al. (2015). We show that these integrated albedo and general circulation models enable us to model non-uniform reflectivity due to exoplanet clouds, and to better interpret observations.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>