979 citations · 13.8k across the 158 of their papers we have counts for
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Discovery of a Low-Mass Companion to the Solar-Type Star TYC 2534-698-1
Stephen R. Kane, Suvrath Mahadevan, William D. Cochran +4
Brown dwarfs and low-mass stellar companions are interesting objects to study since they occupy the mass region between deuterium and hydrogen burning. We report here the serendipi…
The Transit Light Curve Project. X. A Christmas Transit of HD 17156b
Joshua N. Winn, Matthew J. Holman, Gregory W. Henry +6
Photometry is presented of the Dec. 25, 2007 transit of HD 17156b, which has the longest orbital period and highest orbital eccentricity of all the known transiting exoplanets. New…
Planetary systems around close binary stars: the case of the very dusty, Sun-like, spectroscopic binary BD+20 307
B. Zuckerman, Francis C. Fekel, Michael H. Williamson +2
Field star BD+20 307 is the dustiest known main sequence star, based on the fraction of its bolometric luminosity, 4%, that is emitted at infrared wavelengths. The particles that c…
Orbits and Pulsations of the Classical ζAurigae Binaries
Joel A. Eaton, Gregory W. Henry, Andrew P. Odell
We have derived new orbits for zeta Aur, 32 Cyg, and 31 Cyg with observations from the TSU Automatic Spectroscopic Telescope and used them to identify non-orbital velocities of the…
Multi-Wavelength Constraints on the Day-Night Circulation Patterns of HD 189733b
Heather A. Knutson, David Charbonneau, Nicolas B. Cowan +6
We present new Spitzer observations of the phase variation of the hot Jupiter HD 189733b in the MIPS 24 micron bandpass, spanning the same part of the planet's orbit as our previou…
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…
The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
Joshua N. Winn, Matthew J. Holman, Gregory W. Henry +8
We present photometry of HD 189733 during eight transits of its close-in giant planet, and out-of-transit photometry spanning two years. Using the transit photometry, we determine…
Photospheric temperature measurements in young main sequence stars
K. Biazzo, A. Frasca, G. W. Henry +2
As part of our program to study stellar photospheric and chromospheric activity, we have examined several young solar type stars with activity levels intermediate between the Sun a…
The N2K Consortium VI: Doppler Shifts Without Templates and Three New Short-Period Planets
John A. Johnson, Geoffrey W. Marcy, Debra A. Fischer +7
We present a modification to the iodine cell Doppler technique that eliminates the need for an observed stellar template spectrum. For a given target star, we iterate toward a synt…
The First Extrasolar Planet Discovered with a New Generation High Throughput Doppler Instrument
Jian Ge, Julian van Eyken, Suvrath Mahadevan +17
We report the detection of the first extrasolar planet, ET-1 (HD 102195b), using the Exoplanet Tracker (ET), a new generation Doppler instrument. The planet orbits HD 102195, a you…
Rotational and Cyclical Variability in gamma Cassiopeia
M. A. Smith, G. W. Henry, E. Vishniac
We report results of a nine-year monitoring effort on the unusual classical Be with a robotic ground-based (APT) B,V-filtered telescope as well as simultaneous observations in 2004…
System Parameters of the Transiting Extrasolar Planet HD 209458b
Robert A. Wittenmyer, William F. Welsh, Jerome A. Orosz +10
We derive improved system parameters for the HD 209458 system using a model that simultaneously fits both photometric transit and radial velocity observations. The photometry consi…
A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436
Paul Butler, Steven S. Vogt, Geoffrey W. Marcy +5
We report precise Doppler measurements of GJ 436 (M2.5V) obtained at Keck Observatory. The velocities reveal a planetary companion with orbital period of 2.644 d, eccentricity of 0…
A Hot Saturn Planet Orbiting HD 88133, from the N2K Consortium
D. A. Fischer, G. Laughlin, R. P. Butler +20
The N2K consortium is carrying out a distributed observing campaign with the Keck, Magellan and Subaru telescopes, as well as the automatic photometric telescopes of Fairborn Obser…
Searching for Planets in the Hyades III: The Quest for Short-Period Planets
D. Paulson, S. Saar, W. Cochran +1
We have been using the Keck I High Resolution Spectrograph (HIRES) to search for planetary companions in the Hyades cluster. We selected four stars from this sample which showed si…
X-ray and Optical Variations in the Classical Be Star gamma Cas
Richard D. Robinson, Myron A. Smith, Gregory W. Henry
gamma Cas (B0.5e) is known to be a unique X-ray source because ot its moderate L_x, hard X-ray spectrum, and light curve punctuated by ubiquitous flares and slow undulations. Its X…