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Orbital Dynamics Of A Possible Second Planet In HD 17156
Donald Short, William F. Welsh, Jerome A. Orosz +1
In this letter we report the possible existence of a second planet in the transiting extrasolar planet system HD 17156 and its interactive dynamics with the previously known planet…
The Intermediate Polar EI UMa: A Pre-Polar Cataclysmic Variable
Tamara W. Reimer, William F. Welsh, Koji Mukai +1
We present optical and X-ray time-series photometry of EI UMa that reveal modulation at 746 and 770 s, which we interpret as the white dwarf spin and spin-orbit sidebands. These de…
Parameters and Predictions for the Long-Period Transiting Planet HD 17156b
Jonathan Irwin, David Charbonneau, Philip Nutzman +8
We report high-cadence time-series photometry of the recently-discovered transiting exoplanet system HD 17156, spanning the time of transit on UT 2007 October 1, from three separat…
Measuring H-beta BLR Flows in NGC 5548
William F. Welsh, Danielle L. Martino, Go Kawaguchi +1
Using archival International AGN Watch observations we find a correlation between the asymmetry of the H-beta line and the system luminosity: the line becomes bluer as the system g…
On Using the Rossiter Effect to Detect Terrestrial Planets
W. F. Welsh, J. A. Orosz
We explore the possibility that the transit signature of an Earth-size planet can be detected in spectroscopic velocity shifts via the Rossiter effect. Under optimistic but not unr…
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…