Mukadam, Anjum S., Townsley, D. M., Szkody, Paula, Gänsicke, B. T. (Boris T.), Winget, Donald Earl, 1955-, Hermes, J. J., Howell, Steve B., Teske, Johanna, Patterson, Joseph, Kemp, J. (Jonathan) and Armstrong, Eve. (2011) First unambiguous detection of the return of pulsations in the accreting white dwarf SDSS J074531.92+453829.6 after an outburst. The Astrophysical Journal, Vol.728 (No.2). L33. ISSN 0004-637X

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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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Stars, New, Cataclysmic variable stars, Dwarf novae, Stellar oscillations, White dwarf stars
Journal or Publication Title:	The Astrophysical Journal
Publisher:	Institute of Physics Publishing, Inc.
ISSN:	0004-637X
Date:	January 2011
Volume:	Vol.728
Number:	No.2
Page Range:	L33
Identification Number:	10.1088/2041-8205/728/2/L33
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	National Science Foundation (U.S.) (NSF), United States. National Aeronautics and Space Administration (NASA)
Grant number:	AST-0607840 (NSF), HST-GO- 11163.01-A (NASA), AST-0908363(NSF)
References:	Arras, P., Townsley, D. M., & Bildsten, L. 2006, ApJ, 643, L119 Bergeron, P., Fontaine, G., Bill`eres, M., Boudreault, S., & Green, E. M. 2004, ApJ, 600, 404 Brassard, P., Fontaine, G., & Wesemael, F. 1995, ApJS, 96, 545 Brickhill, A. J. 1992a, MNRAS, 259, 519 Brickhill, A. J. 1992b, MNRAS, 259, 529 Bullock, E., et al. 2011, AJ, in press (arXiv:1101.1238) Byckling, K., Osborne, J. P., Wheatley, P. J., Wynn, G. A., Beardmore, A., Braito, V., Mukai, K., & West, R. G. 2009, MNRAS, 399, 1576 Clemens, J. C. 1993, PhD thesis, Univ. of Texas at Austin Copperwheat, C. M., et al. 2009, MNRAS, 393, 157 Drake, A. J., et al. 2009, ApJ, 696, 870 Fontaine, G., & Brassard, P. 2008, PASP, 120, 1043 Gianninas, A., Bergeron, P., & Fontaine, G. 2005, ApJ, 631, 1100 Godon, P., Sion, E. M., Cheng, F., G¨ansicke, B. T., Howell, S., Knigge, C., Sparks, W. M., & Starrfield, S. 2004, ApJ, 602, 336 Godon, P., Sion, E. M., Cheng, F., Long, K. S., G¨ansicke, B. T., & Szkody, P. 2006, ApJ, 642, 1018 Goldreich, P., & Wu, Y. 1999, ApJ, 511, 904 Kanaan, A., Kepler, S. O., & Winget, D. E. 2002, A&A, 389, 896 Kepler, S. O. 1993, Balt. Astron., 2, 515 Kepler, S. O., et al. 2005, ApJ, 634, 1311 Kleinman, S. J., et al. 1998, ApJ, 495, 424 Koester, D., & Holberg, J. B. 2001, in ASP Conf. Ser. 226, 12th European Workshop on White Dwarfs, ed. J. L. Provencal et al. (San Francisco, CA: ASP), 299 Kolb, U., & Baraffe, I. 1999, MNRAS, 309, 1034 Montgomery, M. H. 2005, ApJ, 633, 1142 Montgomery, M. H., Metcalfe, T. S., &Winget, D. E. 2003, MNRAS, 344, 657 Montgomery, M. H., & Winget, D. E. 1999, ApJ, 526, 976 Mukadam, A. S., G¨ansicke, B. T., Szkody, P., Aungwerojwit, A., Howell, S. B., Fraser, O. J., & Silvestri, N. M. 2007, ApJ, 667, 433 Mukadam, A. S.,Montgomery, M. H.,Winget, D. E., Kepler, S. O., & Clemens, J. C. 2006, ApJ, 640, 956 Mukadam, A. S., Szkody, P., G¨ansicke, B. T., & Nitta, A. 2009, J. Phys. Conf. Ser., 172, 012069 Mukadam, A. S.,Winget, D. E., von Hippel, T., Montgomery, M. H., Kepler, S. O., & Costa, A. F. M. 2004, ApJ, 612, 1052 Mukadam, A. S., et al. 2003, ApJ, 594, 961 Mukadam, A. S., et al. 2010, ApJ, 714, 1702 Nather, R. E., & Mukadam, A. S. 2004, ApJ, 605, 846 Nitta, A., Kanaan, A., Kepler, S. O., Koester, D., Montgomery, M. H.,&Winget, D. E. 2000, Balt. Astron., 9, 97 O’Donoghue, D., Kanaan, A., Kleinman, S. J., Krzesinski, J., & Pritchet, C. 2000, Balt. Astron., 9, 375 Piro, A. L., Arras, P., & Bildsten, L. 2005, ApJ, 628, 401 Robinson, E. L., et al. 1995, ApJ, 438, 908 Standish, E. M. 1998, A&A, 336, 381 Szkody, P., G¨ansicke, B. T., Howell, S. B., & Sion, E. M. 2002, ApJ, 575, L79 Szkody, P., et al. 2006, AJ, 131, 973 Szkody, P., et al. 2007, ApJ, 658, 1188 Szkody, P., et al. 2010, ApJ, 710, 64 Tody, D. 1993, in ASP Conf. Ser. 52, Astronomical Data Analysis Software and Systems II, ed. R. J. Hanisch, R. J. V. Brissenden, & J. Barnes (San Francisco, CA: ASP), 173 Townsley, D. M., Arras, P., & Bildsten, L. 2004, ApJ, 608, L105 Townsley, D. M., & Bildsten, L. 2002, ApJ, 565, L35 Townsley, D. M., & Bildsten, L. 2003, ApJ, 596, L227 Townsley, D. M., & Bildsten, L. 2004, ApJ, 600, 390 Townsley, D. M., & G¨ansicke, B. T. 2009, ApJ, 693, 1007 van Zyl, L., et al. 2004, MNRAS, 350, 307 Warner, B., & van Zyl, L. 1998, in IAU Symp. 185, New Eyes to See Inside the Sun and Stars, ed. F.-L. Deubner, J. Christensen-Dalsgaard, & D. Kurtz (Cambridge: Cambridge Univ. Press), 321 Winget, D. E., & Kepler, S. O. 2008, ARA&A, 46, 157 Wu, Y. 2001, MNRAS, 323, 248
URI:	http://wrap.warwick.ac.uk/id/eprint/39760

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