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Statistical Searches for Microlensing Events in Large, Non-Uniformly Sampled Time-Domain Surveys: A Test Using Palomar Transient Factory Data
Adrian M. Price-Whelan, Marcel A. Agüeros, Amanda P. Fournier +7
Many photometric time-domain surveys are driven by specific goals, such as searches for supernovae or transiting exoplanets, which set the cadence with which fields are re-imaged.…
Tracing the Orphan Stream to 55 kpc with RR Lyrae Stars
Branimir Sesar, Carl J. Grillmair, Judith G. Cohen +10
We report positions, velocities and metallicities of 50 ab-type RR Lyrae (RRab) stars observed in the vicinity of the Orphan stellar stream. Using about 30 RRab stars classified as…
Main-belt comets in the Palomar Transient Factory survey: I. The search for extendedness
Adam Waszczak, Eran O. Ofek, Oded Aharonson +7
Cometary activity in main-belt asteroids probes the ice content of these objects and provides clues to the history of volatiles in the inner solar system. We search the Palomar Tra…
Magnetic Cataclysmic Variables Discovered in the Palomar Transient Factory
Bruce Margon, David Levitan, Thomas A. Prince +2
The Palomar Transient Factory proves to be a prolific source of Magnetic Cataclysmic Variables, selected by their distinctive photometric variability, and followed up spectroscopic…
Orbital periods and Accretion disc structure of four AM CVn systems
T. Kupfer, P. J. Groot, D. Levitan +4
Phase-resolved spectroscopy of four AM CVn systems obtained with the William Herschel Telescope and the Gran Telescopio de Canarias (GTC) is presented. SDSS\,J120841.96+355025.2 wa…
R Coronae Borealis Stars in M31 from the Palomar Transient Factory
Sumin Tang, Yi Cao, Lars Bildsten +10
We report the discovery of R Coronae Borealis (RCB) stars in the Andromeda galaxy (M31) using the Palomar Transient Factory (PTF). RCB stars are rare hydrogen-deficient, carbon-ric…