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    First Unambiguous Detection of the Return of Pulsations in the Accreting White Dwarf SDSS J074531.92+453829.6 After an Outburst

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    Date
    2011-02
    Author
    Mukadam, Anjum S.
    Townsley, D. M.
    Szkody, P.
    Gansicke, B. T.
    Winget, D. E.
    Hermes, J. J.
    Howell, Steve B.
    Teske, J.
    Patterson, J.
    Kemp, J.
    Armstrong, Eve
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    Abstract
    The primary white dwarf of the cataclysmic variable SDSS J074531.92+453829.6 was discovered to exhibit non-radial pulsations in 2006 January. This accreting white dwarf underwent its first recorded dwarf nova outburst in 2006 October, during which its brightness increased by more than 5 mag. A Hubble Space Telescope (HST) ultraviolet spectrum, obtained one year after the outburst, revealed a white dwarf temperature of 16,500 K, hotter than all other known accreting white dwarf pulsators. This implies that the accreting primary white dwarf of SDSS J074531.92+453829.6 was heated to temperatures beyond the instability strip during the outburst. Optical observations acquired a year after the outburst did not reveal any evidence of pulsations, suggesting that the white dwarf had not cooled to quiescence by then. We recently acquired optical high-speed time-series photometry on this cataclysmic variable SDSS J074531.92+453829.6 more than three years after its outburst to find that pulsations have now returned to the primary white dwarf. Moreover, the observed pulsation periods agree with pre-outburst periods within the uncertainties of a few seconds. This discovery is significant because it indicates that the outburst did not affect the interior stellar structure, which governs the observed pulsation frequencies. It also suggests that the surface of the white dwarf has now cooled to quiescence. Using this discovery in addition to the prior HST temperature measurement of 16,500 K, we have been able to constrain the matter accreted during the 2006 outburst. This is the first time an accreting white dwarf was unambiguously observed to resume pulsating after an outburst.
    Department
    Astronomy
    Subject
    novae, cataclysmic variables
    stars: dwarf novae
    stars: individual
    (sdss j074531.92+453829.6)
    stars: oscillations
    stars: variables:
    general
    white dwarfs
    zz ceti stars
    hubble-space-telescope
    2001 july outburst
    instability
    strip
    cataclysmic variables
    gw-librae
    effective temperatures
    optical
    observations
    light curves
    spectra
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43106
    Citation
    Mukadam, Anjum S., D. M. Townsley, Paula Szkody, Boris T. Gänsicke, Donald Earl Winget, J. J. Hermes, Steve B. Howell et al. "First unambiguous detection of the return of pulsations in the accreting white dwarf SDSS J074531. 92+ 453829.6 after an outburst." The Astrophysical Journal Letters, Vol. 728, No. 2 (Feb., 2011): L33.
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