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 (2009)
Wittenmeyer, Robert A., Endl, Michael, Cochran, William D., Ramírez, Ivan, Reffert, Sabine, MacQueen, Phillip J., ...
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...
The Discovery of Stellar Oscillations in the K Giant $\iota$ Dra (2008)
Zechmeister, Mathias, Reffert, Sabine, Hatzes, Artie P., Endl, Michael, Quirrenbach, Andreas
$\iota$ Dra (HIP 75458) is a well-known example for a K giant hosting a substellar companion since its discovery by Frink et al. (2002). We present radial velocity measurements of this star from...
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...
Endl, Michael, Kuerster, Martin
The precision of radial velocity (RV) measurements to detect indirectly planetary companions of nearby stars has improved to enable the discovery of extrasolar planets in the Neptune and Super-Earth...
The Spin-Orbit Alignment of the HD17156 Transiting Eccentric Planetary System (2008)
Cochran, William D., Redfield, Seth, Endl, Michael, Cochran, Anita L.
We present high precision radial velocity observations of HD17156 during a transit of its eccentric Jovian planet. In these data, we detect the Rossiter-McLaughlin effect, which is an apparent...
Redfield, Seth, Endl, Michael, Cochran, William D., Koesterke, Lars
We present the first ground-based detection of sodium absorption in the transmission spectrum of an extrasolar planet. Absorption due to the atmosphere of the extrasolar planet HD189733b is detected...
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...
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...
Metallicities of M Dwarf Planet Hosts from Spectral Synthesis (2006)
Bean, Jacob L., Benedict, G. Fritz, Endl, Michael
We present the first spectroscopic metallicities of three M dwarfs with known or candidate planetary mass companions. We have analyzed high resolution, high signal-to-noise spectra of these stars...
The Extrasolar Planet epsilon Eridani b - Orbit and Mass (2006)
Benedict, G. Fritz, McArthur, Barbara E., Gatewood, George, Nelan, Edmund, Cochran, William D., Hatzes, Artie, ...
Hubble Space Telescope observations of the nearby (3.22 pc), K2 V star epsilon Eridani have been combined with ground-based astrometric and radial velocity data to determine the mass of its known...
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...
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 Extrasolar Planet e Eridani b: Orbit and mass (2006)
Benedict, G. Fritz, McArthur, Barbara E., Gatewood, George, Nelan, Edmund, Cochran, William D., Hatzes, Artie, ...
Hubble Space Telescope (HST) observations of the nearby (3.22 pc) K2 V star É Eridani have been combined with ground-based astrometric and radial velocity data to determine the mass of its known...
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...
McArthur, Barbara E., Endl, Michael, Cochran, William D., Benedict, G. Fritz, Fischer, Debra A., Marcy, Geoffrey W., ...
We report the detection of the lowest mass extra-solar planet yet found around a Sun-like star - a planet with an \msini of only 14.21 $\pm$ 2.91 Earth masses in an extremely short period orbit...
HD 137510: An Oasis in the Brown Dwarf Desert (2004)
Endl, Michael, Hatzes, Artie P., Cochran, William D., McArthur, Barbara, Prieto, Carlos Allende, ...
Since the beginning of precise Doppler surveys, which have had stunning success in detecting extrasolar planetary companions, one surprising enigma has emerged: the relative paucity of spectroscopic...
The ESO radial velocity program. Status und results (2004)
Kürster, Martin, Endl, Michael, Els, Sebastian, Hatzes, Artie P., Cochran, William D., Rouesnel, Frédéric, ...
Are there Jupiters in the α Centauri system (2004)
Endl, Michael, Kürster, Martin, Els, Sebastian, Hatzes, Artie P., Cochran, William D., Rouesnel, Frédéric, ...
A Planetary Companion to gamma Cephei A (2003)
Hatzes, Artie P., Cochran, William D., Endl, Michael, McArthur, Barbara, Paulson, Diane B., Walker, Gordon A. H., ...
We report on the detection of a planetary companion in orbit around the primary star of the binary system $\gamma$ Cephei. High precision radial velocity measurements using 4 independent data sets...
Extrasolar Terrestrial Planets: Can We Detect Them Already? (2002)
Endl, Michael, Kuerster, Martin, Rouesnel, Frederic, Els, Sebastian, Hatzes, Artie P., Cochran, William D.
With the example of Proxima Centauri we discuss the feasibility of detecting terrestrial planets (1 to a few M_Earth) using the high precision radial velocity (RV) technique. If a very high RV...
Evidence for a Long-period Planet Orbiting Epsilon Eridani (2000)
Hatzes, Artie P., Cochran, William D., McArthur, Barbara, Baliunas, Sallie L., Walker, Gordon A. H., Campbell, Bruce, ...
High precision radial velocity (RV) measurements spanning the years 1980.8--2000.0 are presented for the nearby (3.22 pc) K2 V star $\epsilon$ Eri. These data, which represent a combination of six...
Abstract.
Abstract.
Thesis (M.A.)--Trinity Evangelical Divinity School, 1993.
Thesis (M.A.)--Trinity Evangelical Divinity School, 1993.