J/MNRAS/445/2268ivo://CDS.VizieR/J/MNRAS/445/2268doi:10.26093/cds/vizier.74452268CDSPitkin M.Williams D.Fletcher L.Grant S.D.T.2024-08-14T20:18:20Z2015-10-09T16:26:29ZCDS support team

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

cds-question@unistra.frstellar-flareseffective-temperatureWe present a Bayesian-odds-ratio-based algorithm for detecting stellar flares in light-curve data. We assume flares are described by a model in which there is a rapid rise with a half-Gaussian profile, followed by an exponential decay. Our signal model also contains a polynomial background model required to fit underlying light-curve variations in the data, which could otherwise partially mimic a flare. We characterize the false alarm probability and efficiency of this method under the assumption that any unmodelled noise in the data is Gaussian, and compare it with a simpler thresholding method based on that used in Walkowicz et al. We find our method has a significant increase in detection efficiency for low signal-to-noise ratio (S/N) flares. For a conservative false alarm probability our method can detect 95 per cent of flares with S/N less than 20, as compared to S/N of 25 for the simpler method. We also test how well the assumption of Gaussian noise holds by applying the method to a selection of 'quiet' Kepler stars. As an example we have applied our method to a selection of stars in Kepler Quarter 1 data. The method finds 687 flaring stars with a total of 1873 flares after vetos have been applied. For these flares we have made preliminary characterizations of their durations and and S/N.2014MNRAS.445.2268Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/445/2268CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/445/2268https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/445/2268http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/445/2268https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/445/2268https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/445/2268http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/445/2268GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/445/2268/table2 (A summary table of flare statistics)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/445/2268/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/445/2268/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/445/2268/table2?GETtext/xml+votable180.050000true290.626537.14268890.0055555555555555564/922 944 5/3645-3646 3693-3695 3704 3706 3729-3734 3736 3738-3741 3781-3786 3788-3789 3792 6/14573 14575 14578-14579 14588-14589 14591 14730-14731 14733-14735 14738 14744 14746 14750-14751 14768 14770-14771 14794 14822 14828 14830 14914-14915 14940-14942 14948-14950 14969 14971-14972 14974-14975 15041 15043-15044 15057 15060-15062 15120 15122-15123 15148-15149 15160 15172 15174 15178 15200 15232https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/445/2268?format=asciiOpticaldefaultJ/MNRAS/445/2268/table2A summary table of flare statisticsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKepler IDmeta.id;meta.mainlongNf[1/13] Number of flares on the starmeta.numberintTeff[3232/5150] Effective temperatureKphys.temperature.effectiveintlogg[4.2/4.99] log of the surface gravitylog(cm.s**-2)phys.gravityfloatDur[0.9/20] Median flare durationhsrc.var.pulsefloatS/N[9/576] Median signal-to-noise ratioem.wl.central;stat.medianfloatAmp[32/27541] Median amplitude (Flux in electron/s)s**-1src.var.amplitude;stat.medianfloate_Amp[3/268] Noise standard deviation estimates**-1stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from KIC (2009, Cat. V/133) (right ascension part)degpos.eq.ra;meta.main_DEPositions from KIC (2009, Cat. V/133) (declination part)degpos.eq.dec;meta.main