J/A+A/692/A26ivo://CDS.VizieR/J/A+A/692/A26doi:10.26093/cds/vizier.36920026CDSReguitti A.Pignata G.Maeda K.Moriya T.J.Kuncarayakti H.,Rodriguez O.Bersten M.Anderson J.P.Charalampopoulos P.Fraser M.,Gromadzki M.Young D.R.Benetti S.Cai Y.-Z.Elias-Rosa N.,Lundqvist P.Carini R.Cosentino S.P.Galbany L.Gonzalez-Banuelos M.,Gutierrez C.P.Kopsacheili M.Pineda Garcia J.A.Ramirez M.2025-02-26T20:02:48Z2024-11-29T09:06:57ZCDS support team

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

cds-question@unistra.frsupernovaeccd-photometryvisible-astronomysloan-photometryinfrared-astronomyWe present an analysis of the photometric and spectroscopic dataset of the Type II supernova (SN) 2018ivc in the nearby (10Mpc) galaxy Messier 77. Thanks to the high cadence of the CHASE survey, we observed the SN rising very rapidly by nearly three magnitudes in five hours (or 18mag/d). The r-band light curve presents four distinct phases: the maximum light is reached in just one day, then a first, rapid linear decline precedes a short-duration plateau. Finally, a long, slower linear decline lasted for one year. Following a radio rebrightening, we detected SN 2018ivc four years after the explosion. The early spectra show a blue, nearly featureless continuum, but the spectra evolve rapidly: after about 10 days a prominent Halpha line starts to emerge, with a peculiar profile, but the spectra are heavily contaminated by emission lines from the host galaxy. HeI lines, namely 5876,7065, are also strong. On top of the former, a strong absorption from the Na I doublet is visible, indicative of a non-negligible internal reddening. From its equivalent width, we derive a lower limit on the host reddening of A_V_=1.5mag, while from the Balmer decrement and a match of the B-V colour curve of SN 2018ivc to that of the comparison objects, a host reddening of A_V_=3.0mag is obtained. The spectra are similar to those of SNe II, but with strong He lines. Given the peculiar light curve and spectral features, we suggest SN 2018ivc could be a transitional object between the Type IIL and Type IIb SNe classes. In addition, we found signs of interaction with circumstellar medium in the light curve, making SN 2018ivc also an interacting event. Finally, we modelled the early multi-band light curves and photospheric velocity of SN 2018ivc to estimate the explosion and CSM physical parameters.2024A&A...692A..26Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/692/A26CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/692/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/692/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/692/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/692/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/692/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/692/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap7.952274030004205e-20 4.920466254354166e-19OpticalInfrareddefaultJ/A+A/692/A26/tablec1Magnitudes of SN 2018ivc in the Sloan ugriz filters (sloan.dat)imag? i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? i magnitude errormagstat.error;phot.magfloatnullablezmag? z magnitudemagphot.mag;em.opt.Ifloatnullablee_zmag? z magnitude errormagstat.error;phot.magfloatnullableInstInstrument (1)meta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateCalendar Datetime.epochnullableMJDModified Julian datedtime.epochdoubleumag? u magnitudemagphot.mag;em.opt.Ufloatnullablee_umag? u magnitude errormagstat.error;phot.magfloatnullablegmag? g magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag? g magnitude errormagstat.error;phot.magfloatnullablel_rmagLimit flag on rmagmeta.code.errorcharrmag? r magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? r magnitude errormagstat.error;phot.magfloatnullablel_imagLimit flag on imagmeta.code.errorcharJ/A+A/692/A26/tablec2Magnitudes of SN 2018ivc in Johnson BVRI filters (johnson.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateCalendar Datetime.epochnullableMJDModified Julian datedtime.epochdoubleBmag? B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? B magnitude errormagstat.error;phot.magfloatnullablel_VmagLimit flag on Vmagmeta.code.errorcharVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? V magnitude errormagstat.error;phot.magfloatnullableRmag? R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? R magnitude errormagstat.error;phot.magfloatnullableImag? I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? I magnitude errormagstat.error;phot.magfloatnullableInstInstrument (1)meta.id;instrcharJ/A+A/692/A26/tablec3Magnitudes of SN 2018ivc in the Clear filter (clear.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateCalendar Datetime.epochnullableMJDModified Julian datedtime.epochdoublel_ClearmagLimit flag on Clearmagmeta.code.errorcharClearmagClear magnitudemagphot.mag;em.optfloate_ClearmagClear magnitude errormagstat.error;phot.magfloatInstInstrument (1)meta.id;instrcharJ/A+A/692/A26/tablec4Magnitudes of SN 2018ivc in the NIR JHK filters (nir.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateCalendar Datetime.epochnullableMJDModified Julian datedtime.epochdoubleJmagJ magnitudemagphot.mag;em.IR.Jfloate_JmagJ magnitude errormagstat.error;phot.magfloatHmagH magnitudemagphot.mag;em.IR.Hfloate_HmagH magnitude errormagstat.error;phot.magfloatKmag? K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? K magnitude errormagstat.error;phot.magfloatnullableInstInstrument (1)meta.id;instrcharJ/A+A/692/A26/tablec5Magnitudes of SN 2018ivc in the ATLAS orange and cyan filters (atlas.dat)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateCalendar Datetime.epochnullableMJDModified Julian datedtime.epochdoubleomag? orange magnitudemagphot.mag;em.optfloatnullablee_omag? orange magnitude errormagstat.error;phot.magfloatnullablecmag? cyan magnitudemagphot.mag;em.optfloatnullablee_cmag? cyan magnitude errormagstat.error;phot.magfloatnullable