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NGTS and HST insights into the long period modulation in GW Librae
P. Chote, B. T. Gaensicke, J. McCormac +17
Light curves of the accreting white dwarf pulsator GW Librae spanning a 7.5 month period in 2017 were obtained as part of the Next Generation Transit Survey. This data set comprise…
Hubble Space Telescope Ultraviolet Light Curves Reveal Interesting Properties of CC Sculptoris and RZ Leonis
Paula Szkody, Anjum S. Mukadam, Odette Toloza +6
Time-tag ultraviolet data obtained on the Hubble Space Telescope in 2013 reveal interesting variability related to the white dwarf spin in the two cataclysmic variables RZ Leo and…
GW Librae: Still Hot Eight Years Post-Outburst
Paula Szkody, Anjum S. Mukadam, Boris T. Gaensicke +8
We report continued Hubble Space Telescope (HST) ultraviolet spectra and ground-based optical photometry and spectroscopy of GW Librae eight years after its largest known dwarf nov…
GW Librae: A unique laboratory for pulsations in an accreting white dwarf
O. Toloza, B. T. Gaensicke, J. J. Hermes +22
Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmos…
Hubble Space Telescope and Ground-Based Observations of V455 Andromedae Post-Outburst
Paula Szkody, Anjum S. Mukadam, Boris T. Gaensicke +8
Hubble Space Telescope spectra obtained in 2010 and 2011, three and four years after the large amplitude dwarf nova outburst of V455 And, were combined with optical photometry and…
Multiwavelength Photometry and Hubble Space Telescope Spectroscopy of the Old Nova V842 Centaurus
Edward M. Sion, Paula Szkody, Anjum Mukadam +5
We present ground-based optical and near infrared photometric observations and Hubble Space Telescope COS spectroscopic observations of the old nova V842 Cen (Nova Cen 1986). Analy…
HST and Optical Data on SDSSJ0804+5103 (EZ Lyn) One Year after Outburst
Paula Szkody, Anjum S. Mukadam, Edward M. Sion +3
We present an ultraviolet spectrum and light curve of the short orbital period cataclysmic variable EZ Lyn obtained with the Cosmic Origins Spectrograph on the Hubble Space Telesco…
An independent limit on the axion mass from the variable white dwarf star R548
Alejandro H. Córsico, Leandro G. Althaus, Alejandra D. Romero +5
Pulsating white dwarfs with hydrogen-rich atmospheres, also known as DAV stars, can be used as astrophysical laboratories to constrain the properties of fundamental particles like…
Rapid Orbital Decay in the 12.75-minute WD+WD Binary J0651+2844
J. J. Hermes, Mukremin Kilic, Warren R. Brown +6
We report the detection of orbital decay in the 12.75-min, detached binary white dwarf (WD) SDSS J065133.338+284423.37 (hereafter J0651). Our photometric observations over a 13-mon…
HST and Optical Data Reveal White Dwarf Cooling, Spin and Periodicities in GW Librae 3-4 Years after Outburst
Paula Szkody, Anjum S. Mukadam, Boris T. Gaensicke +9
Since the large amplitude 2007 outburst which heated its accreting, pulsating white dwarf, the dwarf nova system GW Librae has been cooling to its quiescent temperature. Our Hubble…
GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst
Eric Bullock, Paula Szkody, Anjum S. Mukadam +14
The prototype of accreting, pulsating white dwarfs (GW Lib) underwent a large amplitude dwarf nova outburst in 2007. We used ultraviolet data from GALEX and ground-based optical ph…
Analyzing the Low State of EF Eridani with Hubble Space Telescope Ultraviolet Spectra
Paula Szkody, Anjum Mukadam, Boris T. Gaensicke +10
Time-resolved spectra throughout the orbit of EF Eri during its low accretion state were obtained with the Solar Blind Channel on the Advanced Camera for Surveys onboard the Hubble…
Discovery of a Nova-Like Cataclysmic Variable in the Kepler Mission Field
Kurtis A. Williams, Domitilla de Martino, Roberto Silvotti +6
We announce the identification of a new cataclysmic variable star in the field of the Kepler Mission, KIC J192410.81+445934.9. This system was identified during a search for compac…
Evidence for Temperature Change and Oblique Pulsation from Light Curve Fits of the Pulsating White Dwarf GD 358
M. H. Montgomery, J. L. Provencal, A. Kanaan +7
Convective driving, the mechanism originally proposed by Brickhill (1991, 1983) for pulsating white dwarf stars, has gained general acceptance as the generic linear instability mec…
Multi-site Observations of Pulsation in the Accreting White Dwarf SDSS J161033.64-010223.3 (V386 Ser)
Anjum S. Mukadam, D. M. Townsley, B. T. Gaensicke +20
Nonradial pulsations in the primary white dwarfs of cataclysmic variables can now potentially allow us to explore the stellar interior of these accretors using stellar seismology.…
Pulsational Mapping of Calcium Across the Surface of a White Dwarf
Susan E. Thompson, M. H. Montgomery, T. von Hippel +27
We constrain the distribution of calcium across the surface of the white dwarf star G29-38 by combining time series spectroscopy from Gemini-North with global time series photometr…
Finding the Instability Strip for Accreting Pulsating White Dwarfs from HST and Optical Observations
Paula Szkody, Anjum Mukadam, Boris T. Gansicke +9
Time-resolved low resolution Hubble Space Telescope ultraviolet spectra together with ground-based optical photometry and spectra are used to constrain the temperatures and pulsati…
The Impact of the Astro2010 Recommendations on Variable Star Science
Lucianne M. Walkowicz, Andrew C. Becker, Scott F. Anderson +13
The next decade of survey astronomy has the potential to transform our knowledge of variable stars. Stellar variability underpins our knowledge of the cosmological distance ladder,…
XMM-Newton and Optical Observations of Cataclysmic Variables from SDSS
Eric J. Hilton, Paula Szkody, Anjum Mukadam +3
We report on XMM-Newton and optical results for 6 cataclysmic variables that were selected from Sloan Digital Sky Survey spectra because they showed strong HeII emission lines, ind…