J/A+A/549/A77ivo://CDS.VizieR/J/A+A/549/A77doi:10.26093/cds/vizier.35490077CDSZharikov S.Tovmassian G.Aviles A.Michel R.Gonzalez-Buitrago D.,Garcia-Diaz M.T.2017-06-01T08:51:59Z2012-12-21T08:53:41ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frcataclysmic-variable-starsphotometryspectroscopyThis study of SDSS J080434.20+510349.2 (SDSS0804) is primarily concerned with the double-hump shape in the light curve and its connection with the accretion disk in this bounce-back system. Time-resolved photometric and spectroscopic observations were obtained to analyze the behavior of the system between superoutbursts. A qualitative geometric model of a binary system containing a disk with two outer annuli spiral density waves was applied to explain the light curve and the Doppler tomography. Observations were carried out during 2008-2009, after the object's magnitude decreased to V~17.7+/-0.1 from the March 2006 eruption. The light curve clearly shows a sinusoid-like variability with a 0.07mag amplitude and a 42.48min periodicity, which is half of the orbital period of the system. In September 2010, the system underwent yet another superoutburst and returned to its quiescent level by the beginning of 2012. This light curve once again showed a double-hump-shape, but with a significantly smaller (~0.01mag) amplitude. Other types of variability like a "mini-outburst" or SDSS1238-like features were not detected. Doppler tomograms, obtained from spectroscopic data during the same period of time, show a large accretion disk with uneven brightness, implying the presence of spiral waves. We constructed a geometric model of a bounce-back system containing two spiral density waves in the outer annuli of the disk to reproduce the observed light curves. The Doppler tomograms and the double-hump-shape light curves in quiescence can be explained by a model system containing a massive >=0.7M_{sun}_ white dwarf with a surface temperature of ~12000K, a late-type brown dwarf, and an accretion disk with two outer annuli spirals. According to this model, the accretion disk should be large, extending to the 2:1 resonance radius, and cool ~2500K. The inner parts of the disk should be optically thin in the continuum or totally void.2013A&A...549A..77Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/549/A77CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/549/A77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/549/A77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/549/A77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/549/A77https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/549/A77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/549/A77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/549/A77/photPhotometry of SDSS0804recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[502/1959] Heliocentric Julian date (HJD-2454000)dtime.epochdoubleVmagV magnitudemagphot.mag;em.opt.VfloatJ/A+A/549/A77/sp-2004The spectrum of SDSS0804 from SDSS obtained in 2004recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3740/9230] Wavelength {lambda}0.1nmem.wlintFluxFlux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.fluxdoubleJ/A+A/549/A77/sp-01-09The spectrum of SDSS0804 obtained in Jan. 2009recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3740/9230] Wavelength {lambda}0.1nmem.wlintFluxFlux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.fluxdoubleJ/A+A/549/A77/sp-01-12The spectrum of SDSS0804 obtained in Jan. 2012recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3740/9230] Wavelength {lambda}0.1nmem.wlintFluxFlux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.fluxdoubleJ/A+A/549/A77/sp-02-08The spectrum of SDSS0804 obtained in March 2008recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3740/9230] Wavelength {lambda}0.1nmem.wlintFluxFlux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.fluxdoubleJ/A+A/549/A77/sp-03-08The spectrum of SDSS0804 obtained in Feb. 2008recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3740/9230] Wavelength {lambda}0.1nmem.wlintFluxFlux (in erg/s/cm^2^/{AA})cW.m**-2.nm**-1phot.fluxdouble