J/A+A/585/A19ivo://CDS.VizieR/J/A+A/585/A19doi:10.26093/cds/vizier.35850019CDSBonanos A.Z.Boumis P.2017-07-03T14:25:29Z2015-12-09T08:29:03ZCDS support team

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

cds-question@unistra.frgalaxiessupernovaephotometryWe present results of high-cadence monitoring of the optical light curve of the nearby, Type Ia SN 2014J in M82, using the 2.3m Aristarchos telescope. B and V-band photometry on days 15-18 after tmax(B) was obtained with a cadence of 2 min per band, revealing evidence for rapid variability at the 0.02-0.05mag level on timescales of 15-60min on all four nights. The decline slope was measured as steeper in the B-band than in the V-band, and to steadily decrease in both bands from 0.15 mag/day (night 1) to 0.04mag/day (night 4) in V, and from 0.19mag/day (night 1) to 0.06mag/day (night 4) in B, corresponding to the onset of the secondary maximum. We propose that rapid variability could be due to one or a combination of the following scenarios: the clumpiness of the ejecta, their interaction with circumstellar material, the asymmetry of the explosion, or the mechanism causing the secondary maximum in the near-infrared light curve. We encourage the community to undertake high-cadence monitoring of future, nearby and bright supernovae to investigate the intraday behaviour of their light curves.2016A&A...585A..19Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/585/A19CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/799/105 : KELT light curve of the M82 SN 2014J (Siverd+, 2015)J/ApJ/805/74 : SN2014J Swift/UVOT light curves (Brown+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/585/A19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/585/A19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/585/A19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/585/A19https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/585/A19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/585/A19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/585/A19/table2Calibrated differential photometry of SN 2014J compared to S1 in the V and B-bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date (HJD-245000)dtime.epochdoubleFilt[BV] Filtermeta.id;instr.filterchardmagSN-S1 magnitude differencemagphot.mag;arith.difffloate_dmagError in SN-S1 magnitude differencemagstat.error;phot.magfloat