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92 papers · 2 filters
On the 2:1 Orbital Resonance in the HD 82943 Planetary System
Man Hoi Lee, R. Paul Butler, Debra A. Fischer +2
We present an analysis of the HD 82943 planetary system based on a radial velocity data set that combines new measurements obtained with the Keck telescope and the CORALIE measurem…
Gas Giant Protoplanets Formed by Disk Instability in Binary Star Systems
A. P. Boss
We present a suite of three dimensional radiative gravitational hydrodynamics models suggesting that binary stars may be quite capable of forming planetary systems similar to our o…
Measuring Stellar Velocity Dispersions in Active Galaxies
Jenny E. Greene, Luis C. Ho
(ABRIDGED) We present stellar velocity dispersion (sigma*) measurements for a significant sample of 40 broad-line (Type 1) active galaxies for use in testing the well-known relatio…
The M-sigma Relation in Local Active Galaxies
Jenny E. Greene, Luis C. Ho
We examine whether active galaxies obey the same relation between black hole mass and stellar velocity dispersion as inactive systems, using the largest published sample of velocit…
Spectroscopy of GRB 051111 at z=1.54948: Kinematics and Elemental Abundances of the GRB Environment and Host Galaxy
B. E. Penprase, E. Berger, D. B. Fox +8
We present a high-resolution, high signal-to-noise optical spectrum of the afterglow of GRB 051111 obtained with the HIRES spectrograph on the Keck I 10-m telescope. The spectrum e…
Chemical Compositions of Red Giant Stars in Old Large Magellanic Cloud Globular Clusters
Jennifer A. Johnson, Inese I. Ivans, Peter B. Stetson
We have observed ten red giant stars in four old Large Magellanic Cloud globular clusters with the high-resolution spectrograph MIKE on the Magellan Landon Clay 6.5-m telescope. Th…