86 citations · 974 across the 74 of their papers we have counts for
8 papers · 1 filter
Peeking Between the Pulses: The Far-UV Spectrum of the Previously Unseen White Dwarf in AR Scorpii
Peter Garnavich, Colin Littlefield, Maxim Lyutikov +1
The compact object in the interacting binary AR Sco has widely been presumed to be a rapidly rotating, magnetized white dwarf (WD), but it has never been detected directly. Isolati…
Identification of Orbital Eclipses in LAMOST J024048.51+195226.9, a Candidate AE Aqr-type Cataclysmic Variable Star
Colin Littlefield, Peter Garnavich
AE Aqr objects are a class of cataclysmic variable stars in which the rapidly rotating magnetosphere of the white dwarf (WD) primary centrifugally expels most infalling gas before…
Rapid Variability in the Wind from the White Dwarf Merger Candidate J005311
P. Garnavich, C. Littlefield, R. Pogge +1
We analyze time-series spectroscopy of the white dwarf merger candidate J005311 and confirm the unique nature of its optical spectrum. We detect an additional broad emission featur…
Discovery of a New WZ Sagittae Type Cataclysmic Variable in the Kepler/K2 Data
R. Ridden-Harper, B. E. Tucker, P. Garnavich +7
We identify a new, bright transient in the Kepler/K2 Campaign 11 field. Its light curve rises over seven magnitudes in a day and then declines three magnitudes over a month before…
An Improved Spin-Down Rate for the Proposed White-Dwarf Pulsar AR Scorpii
Yadira Gaibor, Peter Garnavich, Colin Littlefield +2
We analyze rapid-cadence, multiwavelength photometry of AR Scorpii from three observatories, covering five observing seasons. We measure the arrival times of the system's beat puls…
Optical spectra of FO Aquarii during low and high accretion rates
M. R. Kennedy, P. M. Garnavich, C. Littlefield +7
Between May 2016 and September 2018, the intermediate polar (IP) FO Aquarii exhibited two distinct low states and one failed low state. We present optical spectroscopy of FO Aquari…
Magnetospheric interaction in white dwarf binaries AR Sco and AE Aqr
Maxim Lyutikov, Maxim Barkov, Matthew Route +3
We develop a model of the white dwarf (WD) - red dwarf (RD) binaries AR Sco and AE Aqr as systems in a transient propeller stage of highly asynchronous intermediate polars. The WDs…
Short-cadence K2 observations of an accretion-state transition in the polar Tau 4
Colin Littlefield, Peter Garnavich, Paula Szkody +5
The Kepler spacecraft observed a total of only four AM Herculis cataclysmic variable stars during its lifetime. We analyze the short-cadence K2 light curve of one of those systems,…