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Richard S. Freedman
Researcher at Search for extraterrestrial intelligence
Publications - 120
Citations - 12900
Richard S. Freedman is an academic researcher from Search for extraterrestrial intelligence. The author has contributed to research in topics: Planet & Brown dwarf. The author has an hindex of 44, co-authored 114 publications receiving 11710 citations. Previous affiliations of Richard S. Freedman include Ames Research Center.
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Journal ArticleDOI
A Nongray Theory of Extrasolar Giant Planets and Brown Dwarfs
Adam Burrows,Mark S. Marley,William B. Hubbard,Jonathan I. Lunine,Tristan Guillot,Didier Saumon,Richard S. Freedman,David Sudarsky,C. M. Sharp +8 more
TL;DR: In this article, the authors present a series of nongray calculations of the atmospheres, spectra, colors, and evolution of extrasolar giant planets (EGPs) and brown dwarfs for effective temperatures below 1300 K.
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A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres
Jonathan J. Fortney,Katharina Lodders,Mark S. Marley,Richard S. Freedman,Richard S. Freedman +4 more
TL;DR: In this paper, the authors highlight the potential importance of gaseous TiO and VO opacity on the highly irradiated close-in giant planets and calculate model atmospheres for these planets, including pressure-temperature profiles, spectra, and characteristic radiative time constants.
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Atmospheric circulation of hot Jupiters: Coupled radiative-dynamical general circulation model simulations of HD 189733b and HD 209458b
Adam P. Showman,Jonathan J. Fortney,Yuan Lian,Mark S. Marley,Richard S. Freedman,Richard S. Freedman,Heather A. Knutson,David Charbonneau +7 more
TL;DR: In this article, the Substellar and Planetary Atmospheric Radiation and Circulation model (SARIMA) was used to simulate the atmospheric dynamics of HD 189733b and HD 209458b and provided a realistic representation of nongray cloud-free radiative transfer.
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Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets
TL;DR: In this paper, the authors present the detailed sources of molecular opacity data employed by their group for this application and present tables of Rosseland and Planck mean opacities, which are of use in some studies of the atmospheres, interiors, and evolution of planets and brown dwarfs.
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Greenhouse warming by CH4 in the atmosphere of early Earth
TL;DR: It is found that a CH4 mixing ratio of 10(-4) (100 ppmv) or more in Earth's early atmosphere would provide agreement with the paleosol data from 2.3-2.4 Ga, which could have triggered the Earth's first widespread glaciation.