GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst

Abstract

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 photometry and spectroscopy to follow GW Lib for three years following this outburst. Several variations are apparent during this interval. The optical shows a superhump modulation in the months following outburst while a 19 min quasi-periodic modulation lasting for several months is apparent in the year after outburst. A long timescale (about 4 hr) modulation first appears in the UV a year after outburst and increases in amplitude in the following years. This variation also appears in the optical 2 years after outburst but is not in phase with the UV. The pre-outburst pulsations are not yet visible after 3 years, likely indicating the white dwarf has not returned to its quiescent state.

32 pages, 13 figures, to be published in The Astronomical Journal

References in corpus (10)

• Pulsational Instabilities in Accreting White Dwarfs
• Dynamical constraints on the component masses of the cataclysmic variable WZ Sge
• HST/STIS Spectroscopy and Modeling of the Long Term Cooling of WZ Sagittae following the July 2001 Outburst
• Finding the Instability Strip for Accreting Pulsating White Dwarfs from HST and Optical Observations
• Swift observations of GW Lib: a unique insight into a rare outburst
• ULTRACAM observations of two accreting white dwarf pulsators
• Time-resolved spectroscopy of the pulsating CV GW Lib
• The mass of the white dwarf in GW Libra
• Multi-site Observations of Pulsation in the Accreting White Dwarf SDSS J161033.64-010223.3 (V386 Ser)
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Cited by in corpus (13)

• WZ Sge-Type Dwarf Novae
• Effective Temperatures of Cataclysmic Variable White Dwarfs as a Probe of their Evolution
• HST and Optical Data Reveal White Dwarf Cooling, Spin and Periodicities in GW Librae 3-4 Years after Outburst
• The Distances of the Galactic Novae
• GW Librae: A unique laboratory for pulsations in an accreting white dwarf
• A brown dwarf donor and an optically thin accretion disc with a complex stream impact region in the period-bouncer candidate BW Sculptoris
• R-mode oscillations in accreting white dwarfs in cataclysmic variables
• Superhumps linked to X-ray emission. The superoutbursts of SSS J122221.7-311525 and GW Lib
• HST and Optical Data on SDSSJ0804+5103 (EZ Lyn) One Year after Outburst
• GW Librae: Still Hot Eight Years Post-Outburst
• The post-outburst pulsations of the accreting white dwarf in the cataclysmic variable GW Librae
• NGTS and HST insights into the long period modulation in GW Librae
• OAO/MITSuME Photometry of Dwarf Novae: I SU Ursae Majoris