J/ApJ/857/68ivo://CDS.VizieR/J/ApJ/857/68doi:10.26093/cds/vizier.18570068CDSHenze M.Darnley M.J.Williams S.C.Kato M.Hachisu I.Anupama G.C.,Arai A.Boyd D.Burke D.Ciardullo R.Chinetti K.Cook L.M.Cook M.J.,Erdman P.Gao X.Harris B.Hartmann D.H.Hornoch K.Horst J.C.,Hounsell R.Husar D.Itagaki K.Kabashima F.Kafka S.Kaur A.,Kiyota S.Kojiguchi N.Kucakova H.Kuramoto K.Maehara H.Mantero A.,Masci F.J.Matsumoto K.Naito H.Ness J.-U.Nishiyama K.Oksanen A.,Osborne J.P.Page K.L.Paunzen E.Pavana M.Pickard R.Prieto-Arranz J.Rodriguez-Gil P.Sala G.Sano Y.Shafter A.W.Sugiura Y.,Tan H.Tordai T.Vrastil J.Wagner R.M.Watanabe F.Williams B.F.,Bode M.F.Bruno A.Buchheim B.Crawford T.Goff B.Hernanz M.,Igarashi A.S.Jose J.Motta M.O'Brien T.J.Oswalt T.Poyner G.,Ribeiro V.A.R.M.Sabo R.Shara M.M.Shears J.Starkey D.Starrfield S.,Woodward C.E.2019-03-27T05:54:48Z2019-03-21T09:03:00ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometrynovaeSince its discovery in 2008, the Andromeda galaxy nova M31N 2008-12a has been observed in eruption every single year. This unprecedented frequency indicates an extreme object, with a massive white dwarf and a high accretion rate, which is the most promising candidate for the single-degenerate progenitor of a Type Ia supernova known to date. The previous three eruptions of M31N 2008-12a have displayed remarkably homogeneous multiwavelength properties: (i) from a faint peak, the optical light curve declined rapidly by two magnitudes in less than two days, (ii) early spectra showed initial high velocities that slowed down significantly within days and displayed clear He/N lines throughout, and (iii) the supersoft X-ray source (SSS) phase of the nova began extremely early, six days after eruption, and only lasted for about two weeks. In contrast, the peculiar 2016 eruption was clearly different. Here we report (i) the considerable delay in the 2016 eruption date, (ii) the significantly shorter SSS phase, and (iii) the brighter optical peak magnitude (with a hitherto unobserved cusp shape). Early theoretical models suggest that these three different effects can be consistently understood as caused by a lower quiescence mass accretion rate. The corresponding higher ignition mass caused a brighter peak in the free-free emission model. The less massive accretion disk experienced greater disruption, consequently delaying the re-establishment of effective accretion. Without the early refueling, the SSS phase was shortened. Observing the next few eruptions will determine whether the properties of the 2016 outburst make it a genuine outlier in the evolution of M31N 2008-12a.2018ApJ...857...68Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/857/68CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/10 : Bell Laboratories H I Profiles (Stark+ 1992)J/ApJ/609/735 : M31 Chandra X-ray sources (Williams+, 2004)J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)J/A+A/465/375 : X-ray monitoring of optical novae in M31 (Pietsch+, 2007)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJS/187/275 : Photometric histories of recurrent novae (Schaefer, 2010)J/A+A/533/A52 : X-ray monitoring of M31 novae (Henze+, 2011)J/ApJS/197/31 : Swift X-ray obs. of classical novae. II. (Schwarz+, 2011)J/A+A/563/A2 : X-ray monitoring of M31 novae (Henze+, 2014)J/A+A/580/A45 : Nova M31N 2008-12a 2014 eruption in opt/UV (Darnley+, 2015)J/ApJ/833/149 : Opt/NIR obs. of M31N 2008-12a 2015 eruption (Darnley+, 2016)J/ApJ/851/L21 : UV-NIR compilation of GW170817 counterpart (Villar+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/857/68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/857/68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/857/68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/857/68https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/857/68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/857/68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/857/68/table10Complete dataset of the visible and near infrared photometric observations of the 2016 eruption of M31N 2008-12arecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsUT Observation date, Yearstime.epoch;obsdt[-5.3/27] Time since eruption (1)dtime.intervalfloatMJDObservation date, Modified Julian date; JD-2457000.5dtime.epochfloatMJD-Start? Start of observation, where available, Modified Julian date; JD-2457000.5dtime.epochfloatnullableMJD-End? End of observation, where available, Modified Julian date; JD-2457000.5dtime.epochfloatnullableTelTelescope + Instrument (2)instrcharExpExposure, time or sequence (coadd x time)stime.duration;obs.exposurecharFiltBroadband Filter (3)meta.notecharl_omagLimit flag for omagmeta.code.errorcharomag[16.3/24.2] Observed magnitude in Filtmagphot.magfloate_omag[0.01/0.5]? Uncertainty in omagmagstat.error;phot.magfloatnullabler_omag[ ,a-k] Photometry Reference(s) (4)meta.refchar