J/AJ/160/6ivo://CDS.VizieR/J/AJ/160/6doi:10.26093/cds/vizier.51600006CDSThorstensen J.R.2023-02-14T14:34:07Z2020-10-14T10:22:52ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomyspectroscopyradial-velocityorbitstrigonometric-parallaxWe present spectroscopy and orbital periods Porb for 30 apparently nonmagnetic cataclysmic binaries with periods below ~3hr, nearly all of which are dwarf novae, mostly of the SU Ursae Majoris subclass. We then turn to the evidence supporting the prediction that short-period dwarf novae evolve toward longer periods after passing through a minimum period-the "period bounce" phenomenon. Plotting data from the literature reveals that for superhump period excess {epsilon}=(P_sh_-P_orb_)/P_orb_ below ~0.015, the period appears to increase with decreasing {epsilon}, agreeing at least qualitatively with the predicted behavior. Next, motivated by the long (decadal) outburst intervals of the WZ Sagittae subclass of short-period dwarf novae, we ask whether there could be a sizable population of "lurkers"-systems that resemble dwarf novae at minimum light, but which do not outburst over accessible timescales (or at all) and therefore do not draw attention to themselves. By examining the outburst history of the Sloan Digital Sky Survey sample of Cataclysmic Variables (CVs), which were selected by color and not by outburst, we find that a large majority of the color-selected dwarf-nova-like objects have been observed to outburst, and we conclude that "lurkers," if they exist, are a relatively minor part of the CV population.2020AJ....160....6Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)V/110 : Catalog of Cataclysmic Variables (Downes+ 2001)V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)J/A+AS/132/341 : ROSAT GPS optical identification (Motch+ 1998)J/MNRAS/373/687 : Spectra of 5 faint cataclysmic variables (Southworth+, 2006)J/AJ/134/185 : Cataclysmic variables from SDSS-DR5 (Szkody+, 2007)J/AJ/136/2107 : Distances of cataclysmic variables (Thorstensen+, 2008)J/MNRAS/384/1277 : H{alpha} emission line sources from IPHAS (Witham+, 2008)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/A+A/524/A86 : Light curves of SDSS J003941.06+005427.5 (Southworth+, 2010)J/MNRAS/402/436 : New Dwarf novae in SDSS, GALEX and astrom. cat. (Wils+,2010)J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)J/AJ/144/81 : Spectro. & photometry of CV candidates (Thorstensen+, 2012)J/MNRAS/421/2414 : Faint cataclysmic variables from SDSS (Woudt+, 2012)J/MNRAS/443/3174 : 72 faint CV candidates in CRTS (Breedt+, 2014)J/MNRAS/441/1186 : Cataclysmic variables from CRTS (Drake+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/AJ/150/170 : Radial velocities of 7 cataclysmic binaries (Halpern+, 2015)J/AJ/149/128 : RVs of 29 cataclysmic variables (Thorstensen+, 2015)J/AJ/152/226 : RVs of 35 cataclysmic variables (Thorstensen+, 2016)J/PASJ/68/65 : Superhumps in SU UMa-type dwarf novae (Kato+, 2016)J/MNRAS/465/4968 : Cataclysmic variables observations (Hardy+, 2017)J/PASJ/69/75 : Superhumps in SU UMa-type dwarf novae (Kato+, 2017)J/AJ/155/247 : RVs of 6 X-ray cataclysmic binaries (Halpern+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/6https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/160/6/cvs (List of CVS and fits to radial velocities (paste of table 1 and table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/6/cvs?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/6/cvs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/6/cvs?GETtext/xml+votable180.050000true6.2959916712.286613890.005555555555555556Cone search capability for table J/AJ/160/6/table4 (Candidate period bouncers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/6/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/6/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/6/table4?GETtext/xml+votable180.050000true168.0725-35.64138890.005555555555555556Cone search capability for table J/AJ/160/6/table5 (SDSS CVs without known outbursts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/6/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/6/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/6/table5?GETtext/xml+votable180.050000true9.92112970.90769830.0055555555555555566/669 733 901 1639 1720 1761 2297 2309 3423 4120 4999 5058 5409 6042 6643 7172 7348 7704 8359 8475 8545 9214 9301 9723 10085 10214 11280 11489 11929 12767 13078 14784 15150 15346 15694 16041 16272 17983 18071 19194 19316 19574 20365 22010 22384 23152 23549 24217 24283 25415 26208 27254 27671 28082 29184 29910 31331 33434 38373 44893 46978 47309 490291.9867573869263685e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/160/6?format=asciiOpticaldefaultJ/AJ/160/6/cvsList of CVS and fits to radial velocities (paste of table 1 and table 3)SimbadNameSimbad column added by the CDSmeta.idcharnullableRVsmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDisplay data from Gaia DR1 (I/337) within 1'meta.ref.urlintnullableRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainGmag[16.37/19.4] G band magnitude (1)magphot.mag;em.opt.VfloatDist[153/1400] Distance 1/parallax w/o corrections (1)pcpos.distancefloatE_Dist[3/1200]? Upper uncertainty on Distpcstat.error;stat.maxfloatnullablee_Dist[3/450] Lower (or symmetric) uncertainty on Distpcstat.errorfloatNobsNumber of observations for this object (link to table 2)meta.numberintnullableNameStar identificationmeta.id;meta.maincharprimaryT0[52437/58868] Epoch, Heliocentric Julian Date JD-2400000 (1)dtime.epoch;pos.heliocentricdoublee_T0[2/20] Error in T0 (3)dstat.errorintPer[0.05/0.11] Orbital period (2)dtime.perioddoublee_Per[2/18] Error in P (3)dstat.errorintf_PerFlag on Per (4)meta.codecharK[22/108] Sinusoid fit parameter (2)km/sstat.fit.paraminte_K[4/23] Uncertainty in K (3)km/sstat.errorintgamma[-97/90] Sinusoid fit parameter ({gamma}) (2)km/sstat.fit.paraminte_gamma[3/16] Uncertainty in gamma (3)km/sstat.errorintN[20/127] Number of data pointsmeta.numberintsigma[13/40] RMS residual of the fit ({sigma})km/sstat.fit.residualintJ/AJ/160/6/table2Radial velocitiesNameStar identificationmeta.id;meta.maincharJD[2451644/2458868] Barycentric Julian Date (UTC) of mid-integrationdtime.epochdoubleHRV[-261/196] Barycentric radial velocity of H-{alpha}km/sspect.dopplerVelocinte_HRV[4/97] Uncertainty of radial velocity based on counting statisticskm/sstat.errorintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/AJ/160/6/table4Candidate period bouncersSimbadNameSimbad column added by the CDSmeta.idcharnullableNameCandidate identificationmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[0/22] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainepsilon[0.004/0.02] Fractional superhump period excess ({epsilon})time.periodfloatq[0.02/0.07] Mass ratiophys.massfloatPorb[0.05/0.07] Orbital perioddtime.perioddoublePorb-min[84.2/92.4] Orbital periodmintime.periodfloatRefsReferences (1)meta.ref;pos.framecharJ/AJ/160/6/table5SDSS CVs without known outburstsGmag[17.9/20.9]? Gaia DR2 G band magnitudemagphot.mag;em.optfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identification of the star (JHHMMSSss+DDMMSSs)meta.id;meta.maincharr_SDSS[1/8] Paper in which the object was identified (1)meta.ref;pos.frameintTypeType (2)src.classcharPorbOrbital periodmintime.periodcharf_PorbFlag on Porb (3)meta.codecharr_PorbReference for Porb (4)meta.ref;pos.framechargmag[18.5/21.9] SDSS g' band magnitude from discovery papersmagphot.mag;em.opt.BfloatGaiaDisplay data from Gaia DR2 (I/345) within 1'meta.ref.urlintnullablePlx[-1.34/4.46]? Gaia DR2 Parallaxmaspos.parallaxfloatnullablee_Plx[0.16/1.96]? Uncertainty in Plxmasstat.error;pos.parallaxfloatnullablePM[4.61/78.9]? Total proper motion (5)mas/yrpos.pmfloatnullable_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.main