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The record-breaking rotational braking of the He strong CP star HD 37776
Z. Mikulasek, J. Krticka, J. Zverko +8
We study the long-term light and spectral variations in the He-strong magnetic chemically peculiar star HD 37776 (V901 Ori) to search for changes of its 1.5387 d period in 1976-200…
Five New Transits of the Super-Neptune HD 149026
Joshua N. Winn, Gregory W. Henry, Guillermo Torres +1
We present new photometry of HD 149026 spanning five transits of its "super-Neptune" planet. In combination with previous data, we improve upon the determination of the planet-to-s…
The Rotation Period of the Planet-Hosting Star HD 189733
Gregory W. Henry, Joshua N. Winn
We present synoptic optical photometry of HD 189733, the chromospherically active parent star of one of the most intensively studied exoplanets. We have significantly extended the…
Two Jovian-Mass Planets in Earthlike Orbits
Sarah E. Robinson, Gregory Laughlin, Steven S. Vogt +7
We report the discovery of two new planets: a 1.94 M_Jup planet in a 1.8-year orbit of HD 5319, and a 2.51 M_Jup planet in a 1.1-year orbit of HD 75898. The measured eccentricities…
Five Intermediate-Period Planets from the N2K Sample
Debra A. Fischer, Steven S. Vogt, Geoffrey W. Marcy +12
We report the detection of five Jovian mass planets orbiting high metallicity stars. Four of these stars were first observed as part of the N2K program and exhibited low RMS veloci…
Patterns of photometric and chromospheric variation among Sun-like stars: A 20-year perspective
G. W. Lockwood, B. A. Skiff, Gregory W. Henry +5
We examine patterns of variation of 32 primarily main sequence stars, extending our previous 7-12 year time series to 13-20 years by combining b, y data from Lowell Observatory wit…