Robert A. Wittenmyer

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...

HD 91669b: A New Brown Dwarf Candidate from the McDonald Observatory Planet Search (2008)

Wittenmyer, Robert A., Endl, Michael, Cochran, William D., Ramirez, Ivan, Reffert, Sabine, MacQueen, Phillip J., ...

We report the detection of a candidate brown dwarf orbiting the metal-rich K dwarf HD 91669, based on radial-velocity data from the McDonald Observatory Planet Search. HD 91669b is a substellar...

A multi-site campaign to measure solar-like oscillations in Procyon. I. Observations, Data Reduction and Slow Variations (2008)

Arentoft, Torben, Kjeldsen, Hans, Bedding, Timothy R., Bazot, Michael, Christensen-Dalsgaard, Joergen, Dall, Thomas H., ...

We have carried out a multi-site campaign to measure oscillations in the F5 star Procyon A. We obtained high-precision velocity observations over more than three weeks with eleven telescopes, with...

An m sin i = 24 Earth Mass Planetary Companion To The Nearby M Dwarf GJ 176 (2007)

Endl, Michael, Cochran, William D., Wittenmyer, Robert A., Boss, Alan P.

We report the detection of a planetary companion with a minimum mass of m sin i = 0.0771 M_Jup = 24.5 M_Earth to the nearby (d = 9.4 pc) M2.5V star GJ 176. The star was observed as part of our M...

Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems (2007)

Wittenmyer, Robert A., Endl, Michael, Cochran, William D., Levison, Harold F.

Long time coverage and high radial velocity precision have allowed for the discovery of additional objects in known planetary systems. Many of the extrasolar planets detected have highly eccentric...

A Planetary System Around HD 155358: The Lowest Metallicity Planet Host Star (2007)

Cochran, William D., Endl, Michael, Wittenmyer, Robert A., Bean, Jacob L.

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 and 0.18. The...

Long-Period Objects in the Extrasolar Planetary Systems 47 UMa and 14 Her (2006)

Wittenmyer, Robert A., Endl, Michael, Cochran, William D.

The possible existence of additional long-period planetary-mass objects in the extrasolar planetary systems 47 UMa and 14 Her is investigated. We combine all available radial-velocity data on these...

Exploring The Frequency Of Close-In Jovian Planets Around M Dwarfs (2006)

Endl, Michael, Cochran, William D., Kuerster, Martin, Paulson, Diane B., Wittenmyer, Robert A., MacQueen, Phillip J., ...

We discuss our high precision radial velocity results of a sample of 90 M dwarfs observed with the Hobby-Eberly Telescope and the Harlan J. Smith 2.7 m Telescope at McDonald Observatory, as well as...

The First Extrasolar Planet Discovered with a New Generation High Throughput Doppler Instrument (2006)

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...

Detection Limits from the McDonald Observatory Planet Search Program (2006)

Wittenmyer, Robert A., Endl, Michael, Cochran, William D., Hatzes, Artie P., Walker, G. A. H., Yang, S. L. S., ...

Based on the long-term radial-velocity surveys carried out with the McDonald Observatory 2.7m Harlan J. Smith Telescope from 1988 to the present, we derive upper limits to long-period giant planet...

Determination Of The Orbit Of The Planetary Companion To The Metal Rich Star HD 45350 (2006)

Endl, Michael, Cochran, William D., Wittenmyer, Robert A., Hatzes, Artie P.

We present the precise radial velocity (RV) data for the metal-rich star HD 45350 collected with the Harlan J. Smith (HJS) 2.7 m telescope and the Hobby-Eberly Telescope (HET) at McDonald...

Exploring the frequency of close-in Jovian planets around M dwarfs (2006)

Endl, Michael, Cochran, William D., Kürster, Martin, Paulson, Diane B., Wittenmyer, Robert A., MacQueen, Phillip J., ...

We discuss our high-precision radial velocity results of a sample of 90 M dwarfs observed with the Hobby-Eberly Telescope and the Harlan J. Smith 2.7 m Telescope at McDonald Observatory, as well as...

THE FIRST EXTRASOLAR PLANET DISCOVERED WITH A NEW-GENERATION HIGH-THROUGHPUT DOPPLER INSTRUMENT (2006)

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...

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...

and (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...