55 citations · 215 across the 12 of their papers we have counts for
9 papers · 1 filter
Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2
Sheila A. Sagear, Julie N. Skinner, Philip S. Muirhead
The occurrence of planets orbiting ultracool dwarfs is poorly constrained. We present results from a Guest Observer program on NASA's K2 spacecraft to search for transiting planets…
New or Improved Orbital Periods of Cataclysmic Binaries
John R. Thorstensen, Frederick A. Ringwald, Cynthia J. Taylor +5
We present a table of 58 cataclysmic binary orbital periods determined using data from MDM Observatory. Most are heretofore unpublished; some are refinements of previously publishe…
Activity and Kinematics of White Dwarf-M Dwarf Binaries from the SUPERBLINK Proper Motion Survey
Julie N. Skinner, Dylan P. Morgan, Andrew A. West +2
We present an activity and kinematic analysis of high proper motion white dwarf-M dwarf binaries (WD+dMs) found in the SUPERBLINK survey, 178 of which are new identifications. To i…
Spectroscopic Orbital Periods for 29 Cataclysmic Variables from the Sloan Digital Sky Survey
John R. Thorstensen, Cynthia J. Taylor, Christopher S. Peters +3
We report follow-up spectroscopy of 29 cataclysmic variables from the Sloan Digital Sky Survey (SDSS), 22 of which were discovered by SDSS and seven other previously known systems…
Cataclysmic Variables in the SUPERBLINK Proper Motion Survey
Julie N. Skinner, John R. Thorstensen, Sébastien Lépine
We have discovered a new high proper motion cataclysmic variable (CV) in the SUPERBLINK proper motion survey, which is sensitive to stars with proper motions greater than 40 mas/yr…
Spectroscopy and Photometry of Cataclysmic Variable Candidates from the Catalina Real Time Survey
John R. Thorstensen, Julie N. Skinner
The Catalina Real Time Survey (CRTS) has found over 500 cataclysmic variable (CV) candidates, most of which were previously unknown. We report here on followup spectroscopy of 36 o…
Discovery of a Bright, Extremely Low-Mass White Dwarf in a Close Double Degenerate System
S. Vennes, J. R. Thorstensen, A. Kawka +6
We report the discovery of a bright (V ~ 13.7), extremely low-mass white dwarf in a close double degenerate system. We originally selected GALEX J171708.5+675712 for spectroscopic…
The New Eclipsing Cataclysmic Variable SDSS 154453+2553
Julie N. Skinner, John R. Thorstensen, Eve Armstrong +1
The cataclysmic variable SDSS154453+2553 was recently identified in the Sloan Digital Sky Survey. We obtained spectra and photometry at the MDM Observatory, which revealed an eclip…
Optical Studies of Twenty Longer-Period Cataclysmic Binaries
John R. Thorstensen, Christopher S. Peters, Julie N. Skinner
We obtained time-series radial velocity spectroscopy of twenty cataclysmic variable stars, with the aim of determining orbital periods P_orb. All of the stars reported here prove t…