J/A+A/602/A93ivo://CDS.VizieR/J/A+A/602/A93doi:10.26093/cds/vizier.36020093CDSKaramehmetoglu E.Taddia F.Sollerman J.Wyrzykowski L.Schmidl S.,Fraser M.Fremling C.Greiner J.Inserra C.Kostrzewa-Rutkowska Z.,Maguire K.Smartt S.Sullivan M.Young D.R.2017-07-17T11:38:32Z2017-06-20T10:11:40ZCDS support team

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

cds-question@unistra.frsupernovaeccd-photometryinfrared-photometryvisible-astronomyphotometrysloan-photometryType Ibn supernovae (SNe Ibn) are thought to be the core-collapse explosions of massive stars whose ejecta interact with He-rich circumstellar material (CSM). We report the discovery of a SN Ibn, with the longest rise-time ever observed, OGLE-2014-SN-131. We discuss the potential powering mechanisms and the progenitor nature of this peculiar stripped-envelope (SE), circumstellar-interacting SN. Optical photometry and spectroscopy were obtained with multiple telescopes including VLT, NTT, and GROND. We compare light curves and spectra with those of other known SNe Ibn and Ibc. CSM velocities are derived from the spectral analysis. The SN light curve is modeled under different assumptions about its powering mechanism (56Ni decay, CSM-interaction, magnetar) in order to estimate the SN progenitor parameters. OGLE-2014-SN-131 spectroscopically resembles SNe Ibn such as SN 2010al. Its peak luminosity and post-peak colors are also similar to those of other SNe Ibn. However, it shows an unprecedentedly long rise-time and a much broader light curve compared to other SNe Ibn. Its bolometric light curve can be reproduced by magnetar and CSM-interaction models, but not by a 56Ni-decay powering model. To explain the unusually long rise-time, the broad light curve, the light curve decline, and the spectra characterized by narrow emission lines, we favor a powering mechanism where the SN ejecta are interacting with a dense CSM. The progenitor of OGLE-2014-SN-131 was likely a Wolf-Rayet star with a mass greater than that of a typical SN Ibn progenitor, which expelled the CSM that the SN is interacting with.2017A&A...602A..93Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/602/A93CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/602/A93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/602/A93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/602/A93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/602/A93https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/602/A93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/602/A93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/A+A/602/A93/ogle*VI Photometry from OGLE telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJD-IJulian Date for I-band observationdtime.epochdoublel_ImagLimit flag in Imag (1)meta.code.errorcharImagApparent (Vega) magnitude in I-bandmagphot.mag;em.opt.Ifloate_Imag? Magnitude error in I-bandmagstat.error;phot.mag;em.opt.IfloatnullableJD-V? Julian Date for V-band observationdtime.epochdoublenullableVmag? Apparent (Vega) magnitude in V-bandmagphot.mag;em.opt.Vfloatnullablee_Vmag? Magnitude error in V-bandmagstat.error;phot.mag;em.opt.VfloatnullableJ/A+A/602/A93/grond*grizJHK photometry from GROND telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Datedtime.epochdoublel_magLimit flag on mag (1)meta.code.errorcharmagApparent magnitude in Filtermagphot.magfloate_mag? Magnitude errormagstat.error;phot.magfloatnullableFilter[grizJHK] GROND filter (grizJHK) of observation (2)obs.param;obschar