J/ApJ/851/L27ivo://CDS.VizieR/J/ApJ/851/L27doi:10.26093/cds/vizier.18519027CDSMarelli M.Tiengo A.De Luca A.Salvetti D.Saronni L.Sidoli L.,Paizis A.Salvaterra R.Belfiore A.Israel G.Haberl F.D'Agostino D.2020-08-07T08:20:48Z2018-09-11T08:15:22ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsx-ray-sourcesWe performed a search for eclipsing and dipping sources in the archive of the EXTraS project-a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A systematic analysis of XMM-Newton observations revealed 13 dips in 40 observations (total exposure time of ~0.8Ms). Among them, four observations show two dips, separated by ~4.01hr. Dip depths and durations are variable. The dips occur only during low-luminosity states (L_0.2-12_<1x10^38^erg/s), while the source reaches L_0.2-12_~2.8x10^38^erg/s. We propose that this system is a new dipping low-mass X-ray binary in M31 seen at high inclination (60{deg}-80{deg}); the observed dipping periodicity is the orbital period of the system. A blue HST source within the Chandra error circle is the most likely optical counterpart of the accretion disk. The high luminosity of the system makes it the most luminous (not ULX) dipper known to date.2017ApJ...851L..27Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/851/L27CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)IX/50 : XMM-Newton Serendipitous Source Catalog 3XMM-DR6 (XMM-SSC, 2016)J/ApJ/577/738 : M31 Chandra X-ray point sources (Kong+, 2002)J/ApJ/578/114 : Chandra HRC source in M31 (Kaaret, 2002)J/ApJ/609/735 : M31 Chandra X-ray sources (Williams+, 2004)J/A+A/434/483 : An XMM-Newton survey of M 31 (Pietsch+, 2005)J/A+A/468/49 : LMXBs in the bulge of M31 (Voss+, 2007)J/A+A/480/599 : XMM-Newton survey of M31 centre field (Stiele+, 2008)J/A+A/534/A55 : Deep XMM-Newton Survey of M31 (Stiele+, 2011)J/ApJ/756/27 : Classification of sources from the 2XMMi-DR3 cat. (Lin+, 2012)J/A+A/555/A65 : X-ray variability of M31 central field (Hofmann+, 2013)J/ApJ/780/83 : X-ray binaries observed in M31 with Chandra (Barnard+, 2014)J/ApJ/813/28 : Autoclassification of variable 3XMM sources (Farrell+, 2015)J/ApJS/224/40 : Catalog of Chandra ACIS point like sources (Wang+, 2016)J/MNRAS/461/3443 : M31 deepest Chandra catalog of point sources (Vulic+, 2016)http://xmmssc-www.star.le.ac.uk/Catalogue/3XMM-DR4/ : 3XMM-DR4 online cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/851/L27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/851/L27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/851/L27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/851/L27https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/851/L27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/851/L27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-raydefaultJ/ApJ/851/L27/table1Dipping light curve parametersJDDate in ISO format converted in Julian Datedtime.epochcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/40] Observation numbermeta.id;meta.mainintObsID[109270101/727960401] XMM ObsIDmeta.notelongDateObservation Date (YYYY-MM-DDThh:mm:ss)stime.epoch;obsnullableExp[10.5/63] Live exposure timekstime.duration;obs.exposurefloatFitBest fit modelmeta.id;stat.fitcharDoF[0/126]? Degrees of Freedomstat.fit.dofintnullablenhp[0/1]? Null hypothesis probabilitystat.fit.goodnessdoublenullableLout[0/2.9]? Luminosity outside the dip, in 10+38erg/s units1e+31Wphys.luminosity;em.X-rayfloatnullablee_Lout[0/0.1]? Uncertainty in Lout1e+31Wstat.errorfloatnullablelin[-5.1e-06/0]? Linear (decrease) in luminosity; in 10+38erg/s2 (1)1e+31J.s**-2phys.luminosity;arith.ratiofloatnullablee_lin[0/7e-07]? Uncertainty in lin1e+31J.s**-2stat.errorfloatnullableTmin[54100.7/55941.8]? Time of minimum luminosity; JD-2400000.5dtime.epochdoublenullablee_Tmin[0.001/0.004]? Uncertainty in Tmindstat.errorfloatnullableDeltaT[2/5]? Duration of the dipkstime.durationfloatnullablee_DeltaT[0.3/1.8]? Uncertainty in DeltaTksstat.errorfloatnullableLmin[0.08/1]? Minimum luminosity, in 10+38erg/s units1e+31Wphys.luminosity;em.X-rayfloatnullablee_Lmin[0.02/0.2]? Uncertainty in Lmin1e+31Wstat.errorfloatnullable3XMMDisplay observation data from the 3XMM-DR6 (IX/50)meta.ref.urlchar