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12 papers · 2 filters
Testing the Early Mars H2-CO2 Greenhouse Hypothesis with a 1-D Photochemical Model
Natasha Batalha, Shawn D. Domagal-Goldman, Ramses Ramirez +1
A recent study by Ramirez et al. (2014) demonstrated that an atmosphere with 1.3-4 bar of CO2 and H2O, in addition to 5-20% H2, could have raised the mean annual and global surface…
The mass of the Mars-sized exoplanet Kepler-138 b from transit timing
Daniel Jontof-Hutter, Jason F. Rowe, Jack J. Lissauer +2
Extrasolar planets that pass in front of their host star (transit) cause a temporary decrease in the apparent brightness of the star once per orbit, providing a direct measure of t…
Stellar activity mimics a habitable-zone planet around Kapteyn's star
Paul Robertson, Arpita Roy, Suvrath Mahadevan
Kapteyn's star is an old M subdwarf believed to be a member of the Galactic halo population of stars. A recent study has claimed the existence of two super-Earth planets around the…
A Comprehensive Characterization of the 70 Virginis Planetary System
Stephen R. Kane, Tabetha S. Boyajian, Gregory W. Henry +6
An on-going effort in the characterization of exoplanetary systems is the accurate determination of host star properties. This effort extends to the relatively bright host stars of…
Hubble Space Telescope search for the transit of the Earth-mass exoplanet Alpha Centauri Bb
Brice-Olivier Demory, David Ehrenreich, Didier Queloz +13
Results from exoplanet surveys indicate that small planets (super-Earth size and below) are abundant in our Galaxy. However, little is known about their interiors and atmospheres.…
Low False-Positive Rate of Kepler Candidates Estimated From A Combination Of Spitzer And Follow-Up Observations
Jean-Michel Désert, David Charbonneau, Guillermo Torres +13
(Abridged) NASA's Kepler mission has provided several thousand transiting planet candidates, yet only a small subset have been confirmed as true planets. Therefore, the most fundam…