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The NASA-UC Eta-Earth Program: III. A Super-Earth orbiting HD 97658 and a Neptune-mass planet orbiting Gl 785
Andrew W. Howard, John Asher Johnson, Geoffrey W. Marcy +7
We report the discovery of planets orbiting two bright, nearby early K dwarf stars, HD 97658 and Gl 785. These planets were detected by Keplerian modelling of radial velocities mea…
The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
Andrew W. Howard, Geoffrey W. Marcy, John Asher Johnson +7
The questions of how planets form and how common Earth-like planets are can be addressed by measuring the distribution of exoplanet masses and orbital periods. We report the occurr…
HAT-P-26b: A Low-Density Neptune-Mass Planet Transiting a K Star
J. D. Hartman, G. Á. Bakos, D. M. Kipping +20
We report the discovery of HAT-P-26b, a transiting extrasolar planet orbiting the moderately bright V=11.744 K1 dwarf star GSC 0320-01027, with a period P = 4.234516 +- 0.000015 d,…
Orbital Orientations of Exoplanets: HAT-P-4b is Prograde and HAT-P-14b is Retrograde
Joshua N. Winn, Andrew W. Howard, John Asher Johnson +9
We present observations of the Rossiter-McLaughlin effect for two exoplanetary systems, revealing the orientations of their orbits relative to the rotation axes of their parent sta…
The Oblique Orbit of the Super-Neptune HAT-P-11b
Joshua N. Winn, John Asher Johnson, Andrew W. Howard +6
We find the orbit of the Neptune-sized exoplanet HAT-P-11b to be highly inclined relative to the equatorial plane of its host star. This conclusion is based on spectroscopic observ…
Chromospheric Activity and Jitter Measurements for 2630 Stars on the California Planet Search
Howard Isaacson, Debra Ann Fischer
We present time series measurements of chromospheric activity for more than 2600 main sequence and subgiant stars on the California Planet Search (CPS) program with spectral types…