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Observational Consequences of the Recently Proposed Super-Earth Orbiting GJ436
Jacob L. Bean, Andreas Seifahrt
Ribas and collaborators have recently proposed that an additional, ~5 M_earth planet orbits the transiting planet host star GJ436. Long-term dynamical interactions between the two…
HST FGS astrometry - the value of fractional millisecond of arc precision
G. Fritz Benedict, Barbara E. McArthur, Jacob L. Bean
In a few years astrometry with the venerable combination of Hubble Space Telescope and Fine Guidance Sensor will be replaced by SIM, GAIA, and long-baseline interferometry. Until t…
A Planetary System Around HD 155358: The Lowest Metallicity Planet Host Star
William D. Cochran, Michael Endl, Robert A. Wittenmyer +1
We report the detection of two planetary mass companions to the solar-type star HD 155358. The two planets have orbital periods of 195.0 and 530.3 days, with eccentricities of 0.11…
The Mass of the Candidate Exoplanet Companion to HD 33636 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities
Jacob L. Bean, Barbara E. McArthur, G. Fritz Benedict +4
We have determined a dynamical mass for the companion to HD 33636 which indicates it is a low-mass star instead of an exoplanet. Our result is based on an analysis of Hubble Space…
Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test of Model Atmospheres
Jacob L. Bean, Christopher Sneden, Peter H. Hauschildt +2
We describe a method for accurately determining M dwarf metallicities with spectral synthesis based on abundance analyses of visual binary stars. We obtained high resolution, high…