J/A+A/643/A35ivo://CDS.VizieR/J/A+A/643/A35doi:10.26093/cds/vizier.36430035CDSParaskeva E.Bonanos A.Z.Liakos A.Spetsieri Z.T.Maund J.R.2024-01-18T08:26:38Z2020-10-28T07:29:11ZCDS support team

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

cds-question@unistra.frsupernovaephotometryvisible-astronomyRapid variability before and near the maximum brightness of supernovae has the potential to provide a better understanding of nearly every aspect of supernovae, from the physics of the explosion up to their progenitors and the circumstellar environment. Thanks to modern time-domain optical surveys, which are discovering supernovae in the early stage of their evolution, we have the unique opportunity to capture their intraday behavior before maximum. We present high-cadence photometric monitoring (on the order of seconds-minutes) of the optical light curves of three Type Ia and two Type II SNe over several nights before and near maximum light, using the fast imagers available on the 2.3m Aristarchos telescope at Helmos Observatory and the 1.2m telescope at Kryoneri Observatory in Greece. We applied differential aperture photometry techniques using optimal apertures and we present reconstructed light curves after implementing a seeing correction and the Trend Filtering Algorithm (TFA, Kovacs et al. 2005MNRAS.356..557K). TFA yielded the best results, achieving a typical precision between 0.01 and 0.04mag. We did not detect significant bumps with amplitudes greater than 0.05mag in any of the SNe targets in the VR-, R-, and I- bands light curves obtained. We measured the intraday slope for each light curve, which ranges between -0.37-0.36mag/d in broadband VR, -0.19-0.31mag/d in R band, and -0.13-0.10mag/d in I band. We used SNe light curve fitting templates for SN 2018gv, SN 2018hgc and SN 2018hhn to photometrically classify the light curves and to calculate the time of maximum. We provide values for the maximum of SN 2018zd after applying a low-order polynomial fit and SN 2018hhn for the first time. We conclude that optimal aperture photometry in combination with TFA provides the highest-precision light curves for SNe that are relatively well separated from the centers of their host galaxies. This work aims to inspire the use of ground-based, high-cadence and high-precision photometry to study SNe with the purpose of revealing clues and properties of the explosion environment of both core-collapse and Type Ia supernovae, the explosion mechanisms, binary star interaction and progenitor channels. We suggest monitoring early supernovae light curves in hotter (bluer) bands with a cadence of hours as a promising way of investigating the post-explosion photometric behavior of the progenitor stars.2020A&A...643A..35Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/643/A35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/643/A35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/643/A35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/643/A35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/643/A35https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/643/A35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/643/A35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/643/A35/table1 (Log of observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/643/A35/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/643/A35/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/643/A35/table1?GETtext/xml+votable180.050000true121.3942083-11.43786110.0055555555555555566/8106 11232 17977 19315 21584https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/643/A35?format=asciiOpticaldefaultJ/A+A/643/A35/table1Log of observationsTypeTypesrc.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharNameSupernova namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainn_Type[ab] Note on Type (1)meta.notecharFilter[R I VR] Filtermeta.id;instr.filtercharNFrameTotal number of framesmeta.numberintTelTelescopemeta.id;instr.telcharlcShow the light curvesmeta.ref.urlcharFileNameName of the table with light curve datameta.id;meta.tablecharJ/A+A/643/A35/18gv-iSN 2018gv I band light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[V I VR] Bandinstr.bandpasscharHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullablemag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullableJ/A+A/643/A35/18gv-rSN 2018gv R band light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[V I VR] Bandinstr.bandpasscharHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullablemag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullableJ/A+A/643/A35/18hgc-vrSN 2018hgc VR band light curvesBand[V I VR] Bandinstr.bandpasscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullablemag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullableJ/A+A/643/A35/18hhn-vrSN 2018hhn VR band light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[V I VR] Bandinstr.bandpasscharHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullablemag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullableJ/A+A/643/A35/18hna-vrSN 2018hna VR band light curvesmag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[V I VR] Bandinstr.bandpasscharHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullableJ/A+A/643/A35/18zd-iSN 2018zd I band light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[V I VR] Bandinstr.bandpasscharHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullablemag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullableJ/A+A/643/A35/18zd-rSN 2018zd R band light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[V I VR] Bandinstr.bandpasscharHJD1? Heliocentric Julian date, 1st part of the nightdtime.epochdoublenullablemag1? Magnitude, 1st part of the night, in Bandmagphot.magfloatnullableHJD2? Heliocentric Julian date, 2nd part of the nightdtime.epochdoublenullablemag2? Magnitude, 2nd part of the night, in Bandmagphot.magfloatnullableHJD3? Heliocentric Julian date (1)dtime.epochdoublenullablemag3? Magnitude, 3rd part of the night, in Band (1)magphot.magfloatnullable