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Climate Modeling of a Potential ExoVenus
Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA.
Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. NASA, Goddard Inst Space Studies, New York, NY 10025 USA.ORCID iD: 0000-0003-3728-0475
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
2018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 869, no 1, article id 46Article in journal (Refereed) Published
Abstract [en]

The planetary mass and radius sensitivity of exoplanet discovery capabilities has reached into the terrestrial regime. The focus of such investigations is to search within the Habitable Zone where a modern Earth-like atmosphere may be a viable comparison. However, the detection bias of the transit and radial velocity methods lies close to the host star where the received flux at the planet may push the atmosphere into a runaway greenhouse state. One such exoplanet discovery, Kepler-1649b, receives a similar flux from its star as modern Venus does from the Sun, and so was categorized as a possible exo Venus. Here we discuss the planetary parameters of Kepler-1649b in relation to Venus to establish its potential as a Venus analog. We utilize the general circulation model ROCKE-3D to simulate the evolution of the surface temperature of Kepler-1649b under various assumptions, including relative atmospheric abundances. We show that in all our simulations the atmospheric model rapidly diverges from temperate surface conditions toward a runaway greenhouse with rapidly escalating surface temperatures. We calculate transmission spectra for the evolved atmosphere and discuss these spectra within the context of the James Webb Space Telescope Near-Infrared Spectrograph capabilities. We thus demonstrate the detectability of the key atmospheric signatures of possible runaway greenhouse transition states and outline the future prospects of characterizing potential Venus analogs.

Place, publisher, year, edition, pages
2018. Vol. 869, no 1, article id 46
Keywords [en]
astrobiology, planetary systems, stars: individual (Kepler-1649)
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-372941DOI: 10.3847/1538-4357/aaec68ISI: 000452893300002OAI: oai:DiVA.org:uu-372941DiVA, id: diva2:1277171
Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved

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