doi:10.1088/0004-6256/135/1/68 THE ROTATION PERIOD OF THE PLANET-HOSTING STAR HD 189733 (2009)
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 timespan of our...
Further Studies of the Photometric Variability of Bright Pulsating Red Giants (2009)
John R. Percy, M. Mashintsova, C. O. Nasui, R. Palaniappan, R. Seneviratne, Gregory W. Henry
telescope (APT) and from the photoelectric photometry program of the American Association of Variable Star Observers has been merged to form data sets that are significantly longer and denser than...
The 8 Micron Phase Variation of the Hot Saturn HD 149026b (2009)
Knutson, Heather A., Charbonneau, David, Cowan, Nicolas B., Fortney, Jonathan J., Showman, Adam P., Agol, Eric, ...
We monitor the star HD 149026 and its Saturn-mass planet at 8.0 micron over slightly more than half an orbit using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. We find an increase...
Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system (2009)
Pál, András, Bakos, Gáspár Á., Torres, Guillermo, Noyes, Robert W., Fischer, Debra A., Johnson, John A., ...
We present refined parameters for the extrasolar planetary system HAT-P-2 (also known as HD 147506), based on new radial velocity and photometric data. HAT-P-2b is a transiting extrasolar planet that...
A Third Planet Orbiting HIP 14810 (2009)
Wright, Jason T., Fischer, Debra A., Ford, Eric B., Veras, Dimitri, Wang, Ji, Henry, Gregory W., ...
We present new precision radial velocities and a three-planet Keplerian orbit fit for the V = 8.5, G5 V star HIP 14810. We began observing this star at Keck Observatory as part of the N2K Planet...
Old, Rich, and Eccentric: Two Jovian Planets Orbiting Evolved Metal-Rich Stars (2009)
Peek, Kathryn M. G., Johnson, John Asher, Fischer, Debra A., Marcy, Geoffrey W., Henry, Gregory W., Howard, Andrew W., ...
We present radial velocity measurements of two stars observed as part of the Lick Subgiants Planet Search and the Keck N2K survey. Variations in the radial velocities of both stars reveal the...
A Search for Multi-Planet Systems Using the Hobby-Eberly Telescope (2009)
Wittenmyer, Robert A., Endl, Michael, Cochran, William D., Levison, Harold F., Henry, Gregory W.
Extrasolar multiple-planet systems provide valuable opportunities for testing theories of planet formation and evolution. The architectures of the known multiple-planet systems demonstrate a...
Discovery of a low-mass companion to the solar-type star TYC 2534-698-1 (2009)
Kane, Stephen R., Mahadevan, Suvrath, Cochran, William D., Street, Rachel A., Sivarani, Thirupathi, Henry, Gregory W., ...
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 serendipitous discovery of a...
The NASA-UC Eta-Earth Program: I. A Super-Earth Orbiting HD 7924 (2009)
Howard, Andrew W., Johnson, John A., Marcy, Geoffrey W., Fischer, Debra A., Wright, Jason T., Henry, Gregory W., ...
We report the discovery of the first low-mass planet to emerge from the NASA-UC Eta-Earth Program, a super-Earth orbiting the K0 dwarf HD 7924. Keplerian modeling of precise Doppler radial velocities...
Zuckerman, B., Fekel, Francis C., Williamson, Michael H., Henry, Gregory W., Muno, M. P.
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 carry this large...
Discovery of a Low-Mass Companion to the Solar-Type Star TYC 2534-698-1 (2008)
Kane, Stephen R., Mahadevan, Suvrath, Cochran, William D., Street, Rachel A., Thirupathi, Sivarani, Henry, Gregory W., ...
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 serendipitous discovery of a...
The Transit Light Curve Project. X. A Christmas Transit of HD 17156b (2008)
Winn, Joshua N., Holman, Matthew J., Henry, Gregory W., Torres, Guillermo, Fischer, Debra, Johnson, John Asher, ...
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 measurements of...
Zuckerman, B., Fekel, Francis C., Williamson, Michael H., Henry, Gregory W., Muno, M. P.
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 carry this large IR...
Orbits and Pulsations of the Classical \zeta Aurigae Binaries (2008)
Eaton, Joel A., Henry, Gregory W., Odell, Andrew P.
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 cool supergiant...
Multi-Wavelength Constraints on the Day-Night Circulation Patterns of HD 189733b (2008)
Knutson, Heather A., Charbonneau, David, Cowan, Nicolas B., Fortney, Jonathan J., Showman, Adam P., Agol, Eric, ...
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 previous observations in...
The Distribution of Activity on the RS CVn–Type Star SZ Piscium (2008)
Joel A. Eaton, Gregory W. Henry
ABSTRACT. We use contemporaneous spectra and BV light curves to derive a model of the distribution of spots and active regions on the cooler component of SZ Psc for the 1993–1994 season. For that...
Chapter 15 Advantages of Automated Observing with Small Telescopes (2008)
Joel A. Eaton, Gregory W. Henry, Francis C. Fekel
Abstract: Advances in communications and electronics have made it possible to operate completely automatic telescopes reliably. This mode of operation lets one use moderately small telescopes to...
B. Zuckerman, Francis C. Fekel, Michael H. Williamson, Gregory W. Henry, M. P. Muno
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 carry this large...
Five Planets Orbiting 55 Cancri (2007)
Fischer, Debra A., Marcy, Geoffrey W., Butler, R. Paul, Vogt, Steven S., Laughlin, Greg, Henry, Gregory W., ...
We report 18 years of Doppler shift measurements of a nearby star, 55 Cancri, that exhibit strong evidence for five orbiting planets. The four previously reported planets are strongly confirmed here....
henry=schwab.tsuniv.edu, fekel=evans.tsuniv.edu, henrysm=galileo.tsuniv.edu AND (2007)
Gregory W. Henry, Francis C. Fekel, Stephen M. Henry, Douglas S. Hall
We have used three automatic photoelectric telescopes to obtain photometric observations of 187 G, K, and (a few) M0 Ðeld giants. We Ðnd low-amplitude photometric variability on timescales of days...
PLANETARY COMPANIONS TO THE METAL-RICH STARS BD [103166 AND HD 522651 (2007)
R. Paul Butler, Steven S. Vogt, Geoffrey W. Marcy, Debra A. Fischer, Gregory W. Henry, Kevin Apps
Precise Doppler measurements from the Keck/HIRES spectrometer reveal periodic Keplerian velocity variations in the stars BD [103166 and HD 52265. BD [103166 (K0 V) has a period of 3.487 days and a...
R. A. Donahue, J. A. Bookbinder, Sallie L. Baliunas, Gregory W. Henry
Olin Wilson became interested in stellar activity cycles in the 1930s, after having been shown by Seth Nicholson a chart of the solar cycle neatly traced by diskintegrated emission of the Ca ii K...
Gregory W. Henry, Sallie L. Baliunas, Robert Donahue Francis, Francis C. Fekel, Willie Soon
We present the results of an analysis of time-series photometry, Ca II H and K spectrophotometry, and high-dispersion visible spectra of nine nearby Sun-like stars recently identied as having...
Two K Giants with Super-meteoritic Lithium Abundances: HDE 233517 and HD 9746 (2007)
Suchitra C. Balachandran, Francis C. Fekel, Gregory W. Henry, Han Uitenbroek
Two unusual Li-rich K giants, HDE 233517 and HD 9746, have been studied. Optical spectroscopy and photometry have been obtained to determine the fundamental parameters of HDE 233517, a single K2 III...
Photometric Variability in a Sample of 187 G and K Giants (2007)
Of G, K Giants, Gregory W. Henry, D. Hall, Francis C. Fekel, ...
We have used three automatic photoelectric telescopes to obtain photometric observations of 187 G, K, and a few M0 eld giants. We nd low-amplitude photometric variability on time scales of days to...
Hd 62454 And Hd 68192 : Two New (2007)
Doradus Variables Anthony, Anthony B. Kaye, Gregory W. Henry, C. Fekel, Richard O. Gray, ...
We present multilongitude, multicolor photometry and simultaneous high-resolution, high signal-tonoise spectroscopy of the newly discovered c Doradus variables HD 62454 and HD 68192. From combined...
And Spectroscopic Variations, Gregory W. Henry, Sallie L. Baliunas, Robert A. Donahue, Francis C. Fekel
We present results of the analysis of time-series photometry, Ca II H and K spectrophotometry and high-dispersion visible spectra of nine nearby Sun-like stars recently identified as having planets....
A Transiting "51 Peg--Like" Planet (2007)
Gregory W. Henry, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt
Doppler measurements from Keck exhibit a sinusoidal periodicity in the velocities of the G0 dwarf HD 209458, having a semiamplitude of 81 m s #1 and a period of 3.5239 days, which is indicative of a...
Techniques for Automated High-Precision Photometry of Sun-like Stars (2007)
Tennessee State University operates several Automatic Photoelectric Telescopes (APTs) located at Fairborn Observatory in the Patagonia Mountains of southern Arizona. The APTs are dedicated to...
Photometry Of Herculis, John R. Percy, G. Bakos, Gregory W. Henry
. We report 4500 days of VRIphotometry of the peculiar high-latitude F2 Ibe star 89 (V441) Herculis, from a robotic photometric telescope, and the American Association of Variable Star Observers...
Activity Cycles in Lower Main Sequence and Post Main Sequence Stars: The HK Project (2007)
R. A. Donahue, J. A. Bookbinder, Sallie Baliunas, Gregory W. Henry
Introduction Olin Wilson became interested in stellar activity cycles in the 1930s, after having been shown by Seth Nicholson a chart of the solar cycle neatly traced by diskintegrated emission of...
Activity Cycles in Lower Main Sequence and Post Main Sequence Stars: The HK Project (2007)
R. A. Donahue, J. A. Bookbinder, Sallie Baliunas, Gregory W. Henry
Introduction Olin Wilson became interested in stellar activity cycles in the 1930s, after having been shown by Seth Nicholson a chart of the solar cycle neatly traced by diskintegrated emission of...
Pulsation Time Scales and Amplitudes in a Sample of Bright Semi-Regular Variable Stars (2007)
Robert A. Donahue, Willie H. Soon, Sallie L. Baliunas, Gregory W. Henry
We have analyzed the differential V -band photometric variations of records up to 8 years long in ten M III semi-regular variable stars. Periodograms constructed from each star's entire record...
fekel=evans.tsuniv.edu, henry=schwab.tsuniv.edu AND (2007)
Francis C. Fekel, Gregory W. Henry, Keinon Brooks, Douglas S. Hall
We have obtained new spectroscopy and photometry of the K0 IV, chromospherically active, singlelined spectroscopic binary HD 10909. Those observations show that the previously reported orbital and...
Francis C. Fekel, Gregory W. Henry, M. Henry
Spectroscopy of HD 161570 shows it to be a single-lined spectroscopic binary with a period of 45.623 days and a nearly circular orbit. The primary star has spectral type G7 III, and the secondary is...
FIRST RESULTS FROM THE ANGLO-AUSTRALIAN PLANET SEARCH: (2007)
A Brown, Dwarf Candidate, A Peglike Planet, C. G. Tinney, R. Paul Butler, Geoffrey W. Marcy, ...
We report results from the Anglo-Australian Planet Search, a survey for planets around 200 solar-type stars in the southern hemisphere that is being carried out on the 3.9 m Anglo-Australian...
A Planet At 5 Au Around 55 Cancri (2007)
Geoffrey Marcy Paul, R. Paul Butler, Debra A. Fischer, Greg Laughlin, Steven S. Vogt, Gregory W. Henry, ...
We report precise Doppler-shift measurements of 55 Cancri (G8 V) obtained from 1989 to 2002 at Lick Observatory. The velocities reveal evidence for an outer planetary companion to 55 Cancri orbiting...
Publications of the Astronomical Society of the Pacific, 113:983--996, 2001 August (2007)
The Astronomical Society, John R. Percy, Joseph B. Wilson, Gregory W. Henry
We report up to 5000 days of VRI photometry, from a robotic photometric telescope, of 34 pulsating red giants, namely, TV Psc, EG And, Z Psc, RZ And, 4 Ori, RX Lep, UW Lyn, h Gem, m Gem, Aur, V523...
THE ASTROPHYSICAL JOURNAL, 551 507511, 2001 April 10 (2007)
The American Astronomical, C. G. Tinney, R. Paul Butler, Geoffrey W. Marcy, Alan J. Penny, ...
We report results from the Anglo-Australian Planet Search, a survey for planets around 200 solar-type stars in the southern hemisphere that is being carried out on the 3.9 m Anglo-Australian...
Chromospherically Active Stars. Xxi. The Giant, Single-Lined (2007)
Binaries Hd And, Francis C. Fekel, Gregory W. Henry, Joel A. Eaton, Julius Sperauskas, Douglas S. Hall
We have obtained spectroscopy and photometry of the chromospherically active, single-lined spectroscopic binaries HD 89546 and HD 113816. HD 89546 has a circular orbit with a period of 21.3596 days....
THE ASTRONOMICAL JOURNAL, 122 : 33833395, 2001 December V (2007)
The American Astronomical, Gregory W. Henry, C. Fekel, Anthony B. Kaye, Ann Kaul
We present high-resolution spectroscopy and precision photometry of ve new c Doradus and ve new d Scuti variables. The ve new c Doradus variables substantially increase the number of conrmed stars of...
Publications of the Astronomical Society of the Pacific, 115:479--483, 2003 April (2007)
The Astronomical Society, John R. Percy, Gurtina Besla, Vince Velocci, Gregory W. Henry
We report multiperiodicity in five small-amplitude pulsating red giants: RZ Ari, V523 Mon, BC CMi, UX Lyn, and FS Com. For each of these stars, two or three periods recur in each season of our 5000...
Seven New Keck Planets Orbiting G And K Dwarfs (2007)
Paul Butler Geoffrey, R. Paul Butler, Geoffrey W. Marcy, Steven S. Vogt, Debra A. Fischer, Gregory W. Henry, ...
Planetary mass companions orbiting seven nearby G and K dwarfs have been found from the Keck Precision Doppler Survey. A " 51 Peg--like " planet orbiting HD 49674 has the smallest mass yet...
A Planetary Companion To Hd 40979 And Additional Planets (2007)
Orbiting Hd And, Debra A. Fischer, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, Gregory W. Henry, ...
We report the detection of three extrasolar planets from the Lick and Keck observatories. The F8 V star HD 40979 has a companion with orbital period P 3 days, eccentricity e 0:05, and velocity...
The Orbit And Pulsation Periods Of The Doradus Variable Hr 6844 (v2502 Ophiuchi) (2007)
Francis Fekel And, Francis C. Fekel, Gregory W. Henry
We obtained spectroscopic and photometric observations of the # Doradus variable HR 6844 (=V2502 Ophiuchi). Radial velocities show that this star is a single-lined binary with a period of 4.4852...
Publications of the Astronomical Society of the Pacific, 114:999--1005, 2002 September (2007)
The Astronomical Society, Gregory W. Henry, Francis C. Fekel
We present high-resolution spectroscopy and precision photometry of five new, relatively bright d Scuti stars. They were originally chosen as photometric comparison stars in our program of automated,...
A Planet At 5 Au Around 55 Cancri (2007)
Geoffrey Marcy Paul, Debra A. Fischer, Greg Laughlin, Steven S. Vogt, Gregory W. Henry, Dimitri Pourbaix
We report precise Doppler-shift measurements of 55 Cancri (G8 V) obtained from 1989 to 2002 at Lick Observatory. The velocities reveal evidence for an outer planetary companion to 55 Cancri orbiting...
Publications of the Astronomical Society of the Pacific, 114:988--998, 2002 September (2007)
The Astronomical Society, Gregory W. Henry, Francis C. Fekel
We present high-resolution spectroscopy and precision photometry of six new g Doradus stars, one of which was independently discovered by another group. This brings the total number of confirmed g...
Five New Transits of the Super-Neptune HD 149026 (2007)
Winn, Joshua N., Henry, Gregory W., Torres, Guillermo, Holman, Matthew J.
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-star radius ratio:...
Wolf, Aaron S., Laughlin, Gregory, Henry, Gregory W., Fischer, Debra A., Marcy, Geoff, Butler, Paul, ...
We report 35 radial velocity measurements of HD 149026 taken with the Keck Telescope. Of these measurements, 15 were made during the transit of the companion planet HD 149026b, which occurred on 2005...
The Rotation Period of the Planet-Hosting Star HD 189733 (2007)
Henry, Gregory W., Winn, Joshua N.
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 timespan of our...
Two Jovian-Mass Planets in Earthlike Orbits (2007)
Robinson, Sarah E., Laughlin, Gregory, Vogt, Steven S., Fischer, Debra A., Butler, R. Paul, Marcy, Geoffrey W., ...
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 are 0.12 for HD...
Five Intermediate-Period Planets from the N2K Sample (2007)
Fischer, Debra A., Vogt, Steven S., Marcy, Geoffrey W., Butler, R. Paul, Sato, Bun'ei, Henry, Gregory W., ...
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 velocity scatter after...
The Sun-like activity of the solar twin 18 Scorpii (2007)
Hall, Jeffrey C., Henry, Gregory W., Lockwood, G. Wesley
We present the results of 10 yr of complementary spectroscopic and photometric observations of the solar twin 18 Scorpii. We show that over the course of its ~7 year chromospheric activity cycle, 18...
Lockwood, G. W., Skiff, B. A., Henry, Gregory W., Henry, Stephen, Radick, R. R., Baliunas, S. L., ...
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 with similar data from...
We analyze photometric data of the active RS CVn–type star HR 1099 for the years 1975–2006 with an inversion technique and reveal the nature of two activity cycles of 15–16 yr and 5.3 � 0.1...
Jeffrey C. Hall, Gregory W. Henry, G. Wesley Lockwood
We present the results of 10 yr of complementary spectroscopic and photometric observations of the solar twin 18 Scorpii. We show that over the course of its 7 yr chromospheric activity cycle, 18...
Sarah E. Robinson, Gregory Laughlin, Steven S. Vogt, Debra A. Fischer, R. Paul Butler, Geoffrey W. Marcy, ...
We report the discovery of two new planets: a 1.94 MJup planet in a 1.8 yr orbit of HD 5319, and a 2.51 MJup planet in a 1.1 yr orbit of HD 75898. The measured eccentricities are 0.12 for HD 5319b...
FIVE INTERMEDIATE-PERIOD PLANETS FROM THE N2K SAMPLE (2007)
Debra A. Fischer, Steven S. Vogt, Geoffrey W. Marcy, R. Paul Butler, Gregory W. Henry, Sarah Robinson, ...
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 velocity scatter after...
A FIVE NEW TRANSITS OF THE SUPER-NEPTUNE HD 149026b (2007)
Joshua N. Winn, Gregory W. Henry, Guillermo Torres, Matthew J. Holman
We present new photometry of HD 149026 spanning five transits of its ‘‘super-Neptune’ ’ planet. In combination with previous data, we improve on the determination of the planet-to-star radius...
A ORBITS AND PULSATIONS OF THE CLASSICAL (2007)
Joel A. Eaton, Gregory W. Henry, Andrew P. Odell
We have derived new orbits for Aur, 32 Cyg, and 31 Cyg with observations from the Tennessee State University (TSU) Automatic Spectroscopic Telescope, and used them to identify nonorbital velocities...
A FIVE PLANETS ORBITING 55 CANCRI 1 (2007)
Debra A. Fischer, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, Greg Laughlin, Gregory W. Henry, ...
We report 18 years of Doppler shift measurements of a nearby star, 55 Cancri, that exhibits strong evidence for five orbiting planets. The four previously reported planets are strongly confirmed...
Winn, Joshua N., Holman, Matthew J., Henry, Gregory W., Roussanova, Anna, Enya, Keigo, Yoshii, Yuzuru, ...
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 the stellar and...
Photospheric and chromospheric activity in four young solar-type stars (2006)
Biazzo, Katia, Frasca, Antonio, Henry, Gregory W., Catalano, Santo, Marilli, Ettore
We present a photometric and spectroscopic study of four G-K dwarfs, namely HD 166, epsilon Eri, chi1 Ori and kappa1 Cet. In three cases, we find a clear spatial association between photospheric and...
Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733 (2006)
Winn, Joshua N., Johnson, John A., Marcy, Geoffrey W., Butler, R. Paul, Vogt, Steven S., Henry, Gregory W., ...
We present spectroscopy of a transit of the exoplanet HD 189733b. By modeling the Rossiter-McLaughlin effect (the anomalous Doppler shift due to the partial eclipse of the rotating stellar surface),...
An Eccentric Hot Jupiter Orbiting the Subgiant HD 185269 (2006)
Johnson, John A., Marcy, Geoffrey W., Fischer, Debra A., Henry, Gregory W., Wright, Jason T., Isaacson, Howard, ...
We report the detection of a Jupiter-mass planet in a 6.838 day orbit around the 1.28 solar mass subgiant HD 185269. The eccentricity of HD 185269b (e = 0.30) is unusually large compared to other...
Ge, Jian, Van Eyken, Julian, Mahadevan, Suvrath, DeWitt, Curtis, Kane, Stephen R., Cohen, Roger, ...
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 young star with solar...
The N2K Consortium VI: Doppler Shifts Without Templates and Three New Short-Period Planets (2006)
Johnson, John A., Marcy, Geoffrey W., Fischer, Debra A., Laughlin, Gregory, Butler, R. Paul, Henry, Gregory W., ...
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 synthetic template...
Jian Ge, Julian Van Eyken, Suvrath Mahadevan, Curtis Dewitt, Stephen R. Kane, Roger Cohen, ...
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 young star with solar...
John Asher Johnson, Geoffrey W. Marcy, Debra A. Fischer, Gregory W. Henry, Jason T. Wright, Howard Isaacson, ...
We report the detection of a Jupiter-mass planet in a 6.838 day orbit around the 1.28 M � subgiant HD 185269. The eccentricity of HD 185269b (e 0:30) is unusually large compared to other planets...
Joshua N. Winn, Matthew J. Holman, Gregory W. Henry, Anna Roussanova, Keigo Enya, Yuzuru Yoshii, ...
We present photometry of HD 189733 during eight transits of its close-in giant planet, and out-of-transit photometry spanning 2 yr. Using the transit photometry, we determine the stellar and...
Joshua N. Winn, John Asher Johnson, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, Gregory W. Henry, ...
We present spectroscopy of a transit of the exoplanet HD 189733b. By modeling the Rossiter-McLaughlin effect (the anomalous Doppler shift due to the partial eclipse of the rotating stellar surface),...
THE N2K CONSORTIUM. VI. DOPPLER SHIFTS WITHOUT TEMPLATES AND THREE NEW SHORT-PERIOD PLANETS 1 (2006)
John Asher Johnson, Geoffrey W. Marcy, Debra A. Fischer, Gregory Laughlin, R. Paul Butler, Gregory W. Henry, ...
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 synthetic template...
Francis C. Fekel, Gregory W. Henry, D. J. Barlow
Our red-wavelength spectroscopic observations of HD 131861, a previously known single-line multiple system, span 20 years. Now lines of two components, the short-period F5 V primary and G8 V...
Gregory W. Henry, Francis C. Fekel, James R. Sowell, Joel S. Gearhart
Our differential BV photometric observations, acquired with an automated telescope at Fairborn Observatory, show that HD 71636 is an eclipsing binary. From follow-up red-wavelength spectroscopic...
A PHOTOMETRY AND SPECTROSCOPY OF 11 � DORADUS STARS (2006)
Gregory W. Henry, Francis C. Fekel, Stephen M. Henry
We have used precise photometric and high-dispersion spectroscopic observations to study 11 � Doradus stars, 10 of them newly confirmed. Only five of these 11 � Doradus stars appear to be single;...
System Parameters of the Transiting Extrasolar Planet HD 209458b (2005)
Wittenmyer, Robert A., Welsh, William F., Orosz, Jerome A., Schultz, A. B., Kinzel, W., Kochte, M., ...
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 consists of previous...
Aaron S. Wolf, Gregory Laughlin, Gregory W. Henry, Debra A. Fischer, Geoff Marcy, Paul Butler, ...
We report 35 radial velocity measurements of HD 149026 taken with the Keck Telescope. Of these measurements, 15 were made during the transit of the companion planet HD 149026b, which occurred on 2005...
Robert A. Wittenmyer, William F. Welsh, Jerome A. Orosz, A. B. Schultz, W. Kinzel, M. Kochte, ...
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 consists of previous...
Steven S. Vogt, R. Paul Butler, Geoffrey W. Marcy, Debra A. Fischer, Gregory W. Henry, Greg Laughlin, ...
We report Doppler measurements for six nearby G- and K-type main-sequence stars that show multiple low-mass companions, at least one of which has planetary mass. One system has three planets, the...
Eugenio J. Rivera, Jack J. Lissauer, R. Paul Butler, Geoffrey W. Marcy, Steven S. Vogt, Debra A. Fischer, ...
High-precision, high-cadence radial velocity monitoring over the past 8 yr at the W. M. Keck Observatory reveals evidence for a third planet orbiting the nearby (4.69 pc) dM4 star GJ 876. The...
A ROTATIONAL AND CYCLICAL VARIABILITY IN � CASSIOPEIA (2005)
Myron A. Smith, Gregory W. Henry, Ethan Vishniac
� Cas is an unusual classical Be star for which the optical-band and hard X-ray fluxes vary on a variety of timescales. We report results of a 9 yr monitoring effort on this star with a robotic...
Debra A. Fischer, Gregory Laughlin, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, John A. Johnson, ...
We report the detection of two short-period planets discovered at Keck Observatory. HD 149143 is a metal-rich G0 IV star with a planet of M sin i 1:33MJ and an orbital radius of 0.053 AU. The...
Debra A. Fischer, Gregory W. Henry, Greg Laughlin, R. Paul Butler, K. L. Tah, ...
Doppler measurements from Subaru and Keck have revealed radial velocity variations in the V 8:15, G0 IV star HD 149026 consistent with a Saturn-mass planet in a 2.8766 day orbit. Photometric...
A SPECTROSCOPY AND PHOTOMETRY OF THE DOUBLE-LINED BINARY HD 149420 (2005)
Francis C. Fekel, Gregory W. Henry
We have used new spectroscopic and photometric observations of HD 149420 to obtain an improved orbital element solution and determine some basic properties of the system. This double-lined binary has...
A DOUBLE-LINED DWARF BINARY (2005)
Francis C. Fekel, Gregory W. Henry, Ceteka Lewis
New spectroscopic and photometric observations of HD 144110 have been used to obtain an improved orbital element solution and determine some basic properties of the system. This chromospherically...
A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436 (2004)
Butler, Paul, Vogt, Steven S., Marcy, Geoffrey W., Fischer, Debra A., Wright, Jason T., Henry, Gregory W., ...
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 0.12 (consistent...
Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, Debra A. Fischer, Gregory W. Henry, Greg Laughlin, ...
We report multiple Doppler measurements of five nearby FGK main-sequence stars and subgiants obtained during
R. Paul Butler, Steven S. Vogt, Geoffrey W. Marcy, Debra A. Fischer, Jason T. Wright, Gregory W. Henry, ...
We report precise Doppler measurements of GJ 436 (M2.5 V) obtained at Keck Observatory. The velocities reveal a planetary companion with orbital period of 2.644 days, eccentricity of 0.12 (consistent...
A ELEVEN NEW � DORADUS STARS (2004)
Gregory W. Henry, Francis C. Fekel, Stephen M. Henry
We present new high-dispersion spectroscopic and precise photometric observations to identify 11 new � Doradus variables. Seven of these new � Doradus stars appear to be single, three are...
A CHROMOSPHERICALLY ACTIVE STARS. XXIV. THE GIANT, SINGLE-LINED BINARIES (2004)
Francis C. Fekel, Gregory W. Henry
We have obtained spectroscopy and photometry of three chromospherically active, single-lined spectroscopic
A HD 8801: A UNIQUE SINGLE Am STAR WITH � DORADUS AND � SCUTI PULSATIONS (2004)
Gregory W. Henry, Francis C. Fekel
We have discovered the first example of a star pulsating intrinsically with both � Doradus and � Scuti frequencies. The star, HD 8801, is an Am metallic-line star that appears to be single. Since...
Debra A. Fischer, R. Paul Butler, Geoffrey W. Marcy, Steven S. Vogt, Gregory W. Henry
We report precise Doppler velocities of HD 3651 obtained at Lick and Keck Observatories. The velocities reveal evidence of a planetary companion with an orbital period of 62:23 0:03 days, an...
Diane B. Paulson, Steven H. Saar, William D. Cochran, Gregory W. Henry
We have been using the Keck I High Resolution Spectrograph to search for planetary companions in the Hyades cluster. We selected four stars from this sample that showed significant radial velocity...
HD 207651: A TRIPLE SYSTEM WITH SCUTI AND ELLIPSOIDAL VARIATIONS BUT NO DORADUS PULSATIONS (2003)
Gregory W. Henry, Francis C. Fekel, Stephen M. Henry
We examine HD 207651 as a possible example of a star exhibiting both Doradus and Scuti type pulsations. We find photometric periods of 0.06479 and 0.06337 days with peak-to-peak amplitudes in Johnson...
A DOZEN NEW DORADUS STARS (2003)
Gregory W. Henry, Francis C. Fekel
We use new high-dispersion spectroscopic and precise photometric observations to identify 12 new Doradus stars. Two of the 12 systems are double-lined binaries that show obvious velocity variability....
A Planet at 5 AU Around 55 Cancri (2002)
Marcy, Geoffrey W., Butler, R. Paul, Fischer, Debra A., Laughlin, Greg, Vogt, Steven S., Henry, Gregory W., ...
We report precise Doppler shift measurements of 55 Cancri (G8V) obtained from 1989 to 2002 at Lick Observatory. The velocities reveal evidence for an outer planetary companion to 55 Cancri orbiting...
X-ray and Optical Variations in the Classical Be Star gamma Cas (2002)
Robinson, Richard D., Smith, Myron A., Henry, Gregory W.
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-ray peculiarities...
Tinney, C. G., Butler, R. Paul, Marcy, Geoffrey W., Jones, Hugh R. A., Penny, Alan J., Vogt, Steven S., ...
We report results from the Anglo-Australian Planet Search -- a survey for planets around 200 solar-type stars in the southern hemisphere, which is being carried out on the 3.9m Anglo-Australian...
Long-Term VRI Photometry Of rho Cassiopeiae (2000)
John R. Percy, L. Kolin, Gregory W. Henry
. We report over 5700 days (15 years) of VRIphotometry of the yellow hypergiant variable star o Cassiopeiae. The V [I color curve is generally in phase with the V light curve on timescales of a few...
R. Paul Butler, Steven S. Vogt, Geoffrey W. Marcy, Debra A. Fischer, Gregory W. Henry, Kevin Apps
Precise Doppler measurements from the Keck/HIRES spectrometer reveal periodic Keplerian velocity variations in the stars BD [10¡3166 and HD 52265. BD [10¡3166 (K0 V) has a period of 3.487 days and...
Properties Of Sun-Like Stars With Planets: 51 Pegasi, 47. . . (1997)
Ursae Majoris, Gregory W. Henry, Sallib L. Baliunas, Robert A. Donahue, Steven H. Saar
Radial velocity variations have revealed planets orbiting 51 Peg, 47 UMa, and 70 Vir, and a low-mass companion orbiting HD 114762. We analyze parallel records of photometric measurements in Stro#...
Properties of Sun-like Stars with Planets: ρ¹ Cancri, τ Boötis, and v Andromedae (1997)
Ae Andromedae, Sallie L. Baliunas, Gregory W. Henry, Robert A. Donahue, Francis C. Fekel, Willie H. Soon
Planets have been reported orbiting the Sun-like stars ae 1 Cnc, ø Boo, and AE And based on low-amplitude radial velocity variations. We have derived 1 Based on observations made at Mount Wilson...
Properties of Sun-like Stars with Planets (1997)
Gregory W. Henry, Sallie L. Baliunas, Robert A. Donahue, Willie H. Soon, Steven H. Saar
Radial velocity variations have revealed planets orbiting 51 Peg, 47 UMa, and 70 Vir, and a low-mass companion orbiting HD 114762. We analyze parallel records of photometric measurements in Stromgren...